Improve pytest parsing for beginner-friendly evaluation feedback#25

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Improve pytest parsing for beginner-friendly evaluation feedback #25

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f559ab1
Improve pytest parsing for beginner-friendly evaluation feedback
NickK21 Jul 19, 2026
a7b42c9
fix(pytest): preserve verbose assertion values
kbuffardi Aug 29, 2026
5d4f7d6
Merge main into beginner-friendly-eval-messages
kbuffardi Aug 29, 2026
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142 changes: 2 additions & 140 deletions executor.js
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,7 @@ const { exec, spawn } = require('child_process');
const path = require('path');
const fs = require('fs').promises;
const { v4: uuidv4 } = require('uuid');
const { parsePytestOutput } = require('./pytest-parser');

/**
* Ensures the datasets repo is cloned or updated in the unique directory.
Expand DownExpand Up@@ -282,145 +283,6 @@ async function handleTestSetup(language, uniqueDir, className, testCode) {
}
}

/**
* Parses pytest output to extract structured test results.
* @param {string} stdout - The stdout from pytest.
* @param {string} [stderr=''] - The stderr from pytest.
* @param {number|null} [exitCode=null] - The pytest process exit code.
* @returns {object} - The test summary.
*/
function buildRawOutput(stdout = '', stderr = '') {
if (stdout && stderr) {
return `${stdout}\n${stderr}`;
}
return stdout || stderr || '';
}

function extractPytestSummary(output) {
const lines = output
.split(/\r?\n/)
.map((line) => line.trim())
.filter(Boolean);

const summaryLine = [...lines].reverse().find((line) => (
/^=+/.test(line) &&
/=+$/.test(line) &&
(/\bin [\d.]+s\b/.test(line) || /\bno tests ran\b/.test(line))
));

if (!summaryLine) {
return '';
}

return summaryLine.replace(/^=+\s*/, '').replace(/\s*=+$/, '');
}

function extractPytestCount(summary, labelPattern) {
const match = summary.match(new RegExp(`(\\d+) ${labelPattern}\\b`));
return match ? parseInt(match[1], 10) : 0;
}

function extractPytestShortSummaryTarget(output, prefix) {
const line = output
.split(/\r?\n/)
.map((entry) => entry.trim())
.find((entry) => entry.startsWith(`${prefix} `));

return line ? line.slice(prefix.length + 1).trim() : '';
}

function extractPytestErrorMessage(output, stderr = '') {
const combined = buildRawOutput(output, stderr);
const patterns = [
/^E\s+([A-Za-z_.]+(?:Error|Exception): .+)$/m,
/^([A-Za-z_.]+(?:Error|Exception): .+)$/m,
/^(ImportError while importing test module .+)$/m,
/^E\s+(.+)$/m,
];

for (const pattern of patterns) {
const match = combined.match(pattern);
if (match) {
return match[1].trim();
}
}

return 'Pytest error during collection or execution';
}

function parsePytestOutput(stdout = '', stderr = '', exitCode = null) {
const summary = extractPytestSummary(stdout);
const rawout = buildRawOutput(stdout, stderr);
const passed_tests = extractPytestCount(summary, 'passed');
const failed_tests = extractPytestCount(summary, 'failed');
const errors = extractPytestCount(summary, 'error(?:s)?');
const no_tests_collected = exitCode === 5 || /\bno tests ran\b/.test(summary);
const failures = [];

const failureBlocks = stdout.split(/={10,} FAILURES ={10,}/)[1]?.split(/={10,}/)[0] || '';
const matches = [...failureBlocks.matchAll(
/_{5,}\s*(.*?)\s*_{5,}[\s\S]*?>\s*assert\s+(.*?)\s*?\nE\s+assert\s+(.*?)\s*?(?:\nE\s+\+\s+where\s+(.*?)\s+=)?/g
)];

matches.forEach((match, index) => {
const test_case = match[1]?.trim() || `Test ${index + 1}`;
const assertionLine = match[2]?.trim();
const failedExpr = match[3]?.trim();
const evaluated = match[4]?.trim() || '';

failures.push({
test_case,
expected: failedExpr.split('==')[1]?.trim() || '',
received: evaluated || failedExpr.split('==')[0]?.trim(),
error_message: `Assertion failed: ${assertionLine}`,
rawout,
});
});

if (failed_tests > 0 && failures.length === 0) {
failures.push({
test_case: extractPytestShortSummaryTarget(stdout, 'FAILED') || 'pytest assertion failure',
expected: '',
received: '',
error_message: 'Pytest reported one or more failed assertions',
rawout,
});
}

let runtime_error = '';

if (errors > 0) {
runtime_error = extractPytestErrorMessage(stdout, stderr);
failures.push({
test_case: extractPytestShortSummaryTarget(stdout, 'ERROR') || 'pytest collection/execution',
expected: '',
received: '',
error_message: runtime_error,
rawout,
});
} else if (no_tests_collected) {
runtime_error = 'Pytest did not collect any tests';
failures.push({
test_case: 'pytest collection',
expected: 'at least 1 collected test',
received: '0 collected tests',
error_message: runtime_error,
rawout,
});
}

return {
tests_run: passed_tests + failed_tests,
passed: passed_tests,
failed: failed_tests,
errors,
no_tests_collected,
exit_code: exitCode,
failure_details: failures,
runtime_error,
};
}

function parseCppTestOutput(output, stdout = '', stderr = '') {
output = output.toString();
let total_tests = 0;
Expand DownExpand Up@@ -617,7 +479,7 @@ async function executeCode(language, code, stdin, expectedOutput, runTests = fal
if (runTests && testCode) {
if (language.toLowerCase() === 'python') {
executionConfig.runCommand = 'pytest';
executionConfig.runArgs = [path.join(uniqueDir, 'test_program.py')];
executionConfig.runArgs = ['-vv', path.join(uniqueDir, 'test_program.py')];
} else if (language.toLowerCase() === 'cpp') {
executionConfig.runCommand = path.join(uniqueDir, 'runner');
executionConfig.runArgs = [];
Expand Down
2 changes: 1 addition & 1 deletion package.json
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -3,7 +3,7 @@
"version": "1.0.0",
"main": "index.js",
"scripts": {
"test": "node test/cpp-harness.test.js && node test/cpp-result.test.js && node test/cpp-harness-smoke.test.js && node test/executor-response.test.js"
"test": "node --test"
},
"keywords": [],
"author": "",
Expand Down
Loading
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Improve pytest parsing for beginner-friendly evaluation feedback#25

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Improve pytest parsing for beginner-friendly evaluation feedback
#25
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f559ab1

Improve pytest parsing for beginner-friendly evaluation feedback


NickK21 Jul 19, 2026
a7b42c9

fix(pytest): preserve verbose assertion values


kbuffardi Aug 29, 2026
5d4f7d6

Merge main into beginner-friendly-eval-messages


kbuffardi Aug 29, 2026

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142 changes: 2 additions & 140 deletions
executor.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,7 @@ const { exec, spawn } = require('child_process');
const path = require('path');
const fs = require('fs').promises;
const { v4: uuidv4 } = require('uuid');
const { parsePytestOutput } = require('./pytest-parser');

/**
 * Ensures the datasets repo is cloned or updated in the unique directory.
Expand DownExpand Up@@ -282,145 +283,6 @@ async function handleTestSetup(language, uniqueDir, className, testCode) {
 }
}

/**
 * Parses pytest output to extract structured test results.
 * @param {string} stdout - The stdout from pytest.
 * @param {string} [stderr=''] - The stderr from pytest.
 * @param {number|null} [exitCode=null] - The pytest process exit code.
 * @returns {object} - The test summary.
 */
function buildRawOutput(stdout = '', stderr = '') {
 if (stdout && stderr) {
 return `${stdout}\n${stderr}`;
 }
 return stdout || stderr || '';
}

function extractPytestSummary(output) {
 const lines = output
 .split(/\r?\n/)
 .map((line) => line.trim())
 .filter(Boolean);

 const summaryLine = [...lines].reverse().find((line) => (
 /^=+/.test(line) &&
 /=+$/.test(line) &&
 (/\bin [\d.]+s\b/.test(line) || /\bno tests ran\b/.test(line))
 ));

 if (!summaryLine) {
 return '';
 }

 return summaryLine.replace(/^=+\s*/, '').replace(/\s*=+$/, '');
}

function extractPytestCount(summary, labelPattern) {
 const match = summary.match(new RegExp(`(\\d+) ${labelPattern}\\b`));
 return match ? parseInt(match[1], 10) : 0;
}

function extractPytestShortSummaryTarget(output, prefix) {
 const line = output
 .split(/\r?\n/)
 .map((entry) => entry.trim())
 .find((entry) => entry.startsWith(`${prefix} `));

 return line ? line.slice(prefix.length + 1).trim() : '';
}

function extractPytestErrorMessage(output, stderr = '') {
 const combined = buildRawOutput(output, stderr);
 const patterns = [
 /^E\s+([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^(ImportError while importing test module .+)$/m,
 /^E\s+(.+)$/m,
 ];

 for (const pattern of patterns) {
 const match = combined.match(pattern);
 if (match) {
 return match[1].trim();
 }
 }

 return 'Pytest error during collection or execution';
}

function parsePytestOutput(stdout = '', stderr = '', exitCode = null) {
 const summary = extractPytestSummary(stdout);
 const rawout = buildRawOutput(stdout, stderr);
 const passed_tests = extractPytestCount(summary, 'passed');
 const failed_tests = extractPytestCount(summary, 'failed');
 const errors = extractPytestCount(summary, 'error(?:s)?');
 const no_tests_collected = exitCode === 5 || /\bno tests ran\b/.test(summary);
 const failures = [];

 const failureBlocks = stdout.split(/={10,} FAILURES ={10,}/)[1]?.split(/={10,}/)[0] || '';
 const matches = [...failureBlocks.matchAll(
 /_{5,}\s*(.*?)\s*_{5,}[\s\S]*?>\s*assert\s+(.*?)\s*?\nE\s+assert\s+(.*?)\s*?(?:\nE\s+\+\s+where\s+(.*?)\s+=)?/g
 )];

 matches.forEach((match, index) => {
 const test_case = match[1]?.trim() || `Test ${index + 1}`;
 const assertionLine = match[2]?.trim();
 const failedExpr = match[3]?.trim();
 const evaluated = match[4]?.trim() || '';

 failures.push({
 test_case,
 expected: failedExpr.split('==')[1]?.trim() || '',
 received: evaluated || failedExpr.split('==')[0]?.trim(),
 error_message: `Assertion failed: ${assertionLine}`,
 rawout,
 });
 });

 if (failed_tests > 0 && failures.length === 0) {
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'FAILED') || 'pytest assertion failure',
 expected: '',
 received: '',
 error_message: 'Pytest reported one or more failed assertions',
 rawout,
 });
 }

 let runtime_error = '';

 if (errors > 0) {
 runtime_error = extractPytestErrorMessage(stdout, stderr);
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'ERROR') || 'pytest collection/execution',
 expected: '',
 received: '',
 error_message: runtime_error,
 rawout,
 });
 } else if (no_tests_collected) {
 runtime_error = 'Pytest did not collect any tests';
 failures.push({
 test_case: 'pytest collection',
 expected: 'at least 1 collected test',
 received: '0 collected tests',
 error_message: runtime_error,
 rawout,
 });
 }

 return {
 tests_run: passed_tests + failed_tests,
 passed: passed_tests,
 failed: failed_tests,
 errors,
 no_tests_collected,
 exit_code: exitCode,
 failure_details: failures,
 runtime_error,
 };
}

function parseCppTestOutput(output, stdout = '', stderr = '') {
 output = output.toString();
 let total_tests = 0;
Expand DownExpand Up@@ -617,7 +479,7 @@ async function executeCode(language, code, stdin, expectedOutput, runTests = fal
 if (runTests && testCode) {
 if (language.toLowerCase() === 'python') {
 executionConfig.runCommand = 'pytest';
 executionConfig.runArgs = [path.join(uniqueDir, 'test_program.py')];
 executionConfig.runArgs = ['-vv', path.join(uniqueDir, 'test_program.py')];
 } else if (language.toLowerCase() === 'cpp') {
 executionConfig.runCommand = path.join(uniqueDir, 'runner');
 executionConfig.runArgs = [];
Expand Down

2 changes: 1 addition & 1 deletion
package.json

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3,7 +3,7 @@
 "version": "1.0.0",
 "main": "index.js",
 "scripts": {
 "test": "node test/cpp-harness.test.js && node test/cpp-result.test.js && node test/cpp-harness-smoke.test.js && node test/executor-response.test.js"
 "test": "node --test"
 },
 "keywords": [],
 "author": "",
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Improve pytest parsing for beginner-friendly evaluation feedback#25

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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privacy statement. We’ll occasionally send you account related emails.

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NickK21
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3
commits into

base:main
Choose a base branch

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Improve pytest parsing for beginner-friendly evaluation feedback
#25
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f559ab1

Improve pytest parsing for beginner-friendly evaluation feedback


NickK21 Jul 19, 2026
a7b42c9

fix(pytest): preserve verbose assertion values


kbuffardi Aug 29, 2026
5d4f7d6

Merge main into beginner-friendly-eval-messages


kbuffardi Aug 29, 2026

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142 changes: 2 additions & 140 deletions
executor.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,7 @@ const { exec, spawn } = require('child_process');
const path = require('path');
const fs = require('fs').promises;
const { v4: uuidv4 } = require('uuid');
const { parsePytestOutput } = require('./pytest-parser');

/**
 * Ensures the datasets repo is cloned or updated in the unique directory.
Expand DownExpand Up@@ -282,145 +283,6 @@ async function handleTestSetup(language, uniqueDir, className, testCode) {
 }
}

/**
 * Parses pytest output to extract structured test results.
 * @param {string} stdout - The stdout from pytest.
 * @param {string} [stderr=''] - The stderr from pytest.
 * @param {number|null} [exitCode=null] - The pytest process exit code.
 * @returns {object} - The test summary.
 */
function buildRawOutput(stdout = '', stderr = '') {
 if (stdout && stderr) {
 return `${stdout}\n${stderr}`;
 }
 return stdout || stderr || '';
}

function extractPytestSummary(output) {
 const lines = output
 .split(/\r?\n/)
 .map((line) => line.trim())
 .filter(Boolean);

 const summaryLine = [...lines].reverse().find((line) => (
 /^=+/.test(line) &&
 /=+$/.test(line) &&
 (/\bin [\d.]+s\b/.test(line) || /\bno tests ran\b/.test(line))
 ));

 if (!summaryLine) {
 return '';
 }

 return summaryLine.replace(/^=+\s*/, '').replace(/\s*=+$/, '');
}

function extractPytestCount(summary, labelPattern) {
 const match = summary.match(new RegExp(`(\\d+) ${labelPattern}\\b`));
 return match ? parseInt(match[1], 10) : 0;
}

function extractPytestShortSummaryTarget(output, prefix) {
 const line = output
 .split(/\r?\n/)
 .map((entry) => entry.trim())
 .find((entry) => entry.startsWith(`${prefix} `));

 return line ? line.slice(prefix.length + 1).trim() : '';
}

function extractPytestErrorMessage(output, stderr = '') {
 const combined = buildRawOutput(output, stderr);
 const patterns = [
 /^E\s+([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^(ImportError while importing test module .+)$/m,
 /^E\s+(.+)$/m,
 ];

 for (const pattern of patterns) {
 const match = combined.match(pattern);
 if (match) {
 return match[1].trim();
 }
 }

 return 'Pytest error during collection or execution';
}

function parsePytestOutput(stdout = '', stderr = '', exitCode = null) {
 const summary = extractPytestSummary(stdout);
 const rawout = buildRawOutput(stdout, stderr);
 const passed_tests = extractPytestCount(summary, 'passed');
 const failed_tests = extractPytestCount(summary, 'failed');
 const errors = extractPytestCount(summary, 'error(?:s)?');
 const no_tests_collected = exitCode === 5 || /\bno tests ran\b/.test(summary);
 const failures = [];

 const failureBlocks = stdout.split(/={10,} FAILURES ={10,}/)[1]?.split(/={10,}/)[0] || '';
 const matches = [...failureBlocks.matchAll(
 /_{5,}\s*(.*?)\s*_{5,}[\s\S]*?>\s*assert\s+(.*?)\s*?\nE\s+assert\s+(.*?)\s*?(?:\nE\s+\+\s+where\s+(.*?)\s+=)?/g
 )];

 matches.forEach((match, index) => {
 const test_case = match[1]?.trim() || `Test ${index + 1}`;
 const assertionLine = match[2]?.trim();
 const failedExpr = match[3]?.trim();
 const evaluated = match[4]?.trim() || '';

 failures.push({
 test_case,
 expected: failedExpr.split('==')[1]?.trim() || '',
 received: evaluated || failedExpr.split('==')[0]?.trim(),
 error_message: `Assertion failed: ${assertionLine}`,
 rawout,
 });
 });

 if (failed_tests > 0 && failures.length === 0) {
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'FAILED') || 'pytest assertion failure',
 expected: '',
 received: '',
 error_message: 'Pytest reported one or more failed assertions',
 rawout,
 });
 }

 let runtime_error = '';

 if (errors > 0) {
 runtime_error = extractPytestErrorMessage(stdout, stderr);
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'ERROR') || 'pytest collection/execution',
 expected: '',
 received: '',
 error_message: runtime_error,
 rawout,
 });
 } else if (no_tests_collected) {
 runtime_error = 'Pytest did not collect any tests';
 failures.push({
 test_case: 'pytest collection',
 expected: 'at least 1 collected test',
 received: '0 collected tests',
 error_message: runtime_error,
 rawout,
 });
 }

 return {
 tests_run: passed_tests + failed_tests,
 passed: passed_tests,
 failed: failed_tests,
 errors,
 no_tests_collected,
 exit_code: exitCode,
 failure_details: failures,
 runtime_error,
 };
}

function parseCppTestOutput(output, stdout = '', stderr = '') {
 output = output.toString();
 let total_tests = 0;
Expand DownExpand Up@@ -617,7 +479,7 @@ async function executeCode(language, code, stdin, expectedOutput, runTests = fal
 if (runTests && testCode) {
 if (language.toLowerCase() === 'python') {
 executionConfig.runCommand = 'pytest';
 executionConfig.runArgs = [path.join(uniqueDir, 'test_program.py')];
 executionConfig.runArgs = ['-vv', path.join(uniqueDir, 'test_program.py')];
 } else if (language.toLowerCase() === 'cpp') {
 executionConfig.runCommand = path.join(uniqueDir, 'runner');
 executionConfig.runArgs = [];
Expand Down

2 changes: 1 addition & 1 deletion
package.json

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3,7 +3,7 @@
 "version": "1.0.0",
 "main": "index.js",
 "scripts": {
 "test": "node test/cpp-harness.test.js && node test/cpp-result.test.js && node test/cpp-harness-smoke.test.js && node test/executor-response.test.js"
 "test": "node --test"
 },
 "keywords": [],
 "author": "",
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Improve pytest parsing for beginner-friendly evaluation feedback
#25
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f559ab1

Improve pytest parsing for beginner-friendly evaluation feedback


NickK21 Jul 19, 2026
a7b42c9

fix(pytest): preserve verbose assertion values


kbuffardi Aug 29, 2026
5d4f7d6

Merge main into beginner-friendly-eval-messages


kbuffardi Aug 29, 2026

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142 changes: 2 additions & 140 deletions
executor.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,7 @@ const { exec, spawn } = require('child_process');
const path = require('path');
const fs = require('fs').promises;
const { v4: uuidv4 } = require('uuid');
const { parsePytestOutput } = require('./pytest-parser');

/**
 * Ensures the datasets repo is cloned or updated in the unique directory.
Expand DownExpand Up@@ -282,145 +283,6 @@ async function handleTestSetup(language, uniqueDir, className, testCode) {
 }
}

/**
 * Parses pytest output to extract structured test results.
 * @param {string} stdout - The stdout from pytest.
 * @param {string} [stderr=''] - The stderr from pytest.
 * @param {number|null} [exitCode=null] - The pytest process exit code.
 * @returns {object} - The test summary.
 */
function buildRawOutput(stdout = '', stderr = '') {
 if (stdout && stderr) {
 return `${stdout}\n${stderr}`;
 }
 return stdout || stderr || '';
}

function extractPytestSummary(output) {
 const lines = output
 .split(/\r?\n/)
 .map((line) => line.trim())
 .filter(Boolean);

 const summaryLine = [...lines].reverse().find((line) => (
 /^=+/.test(line) &&
 /=+$/.test(line) &&
 (/\bin [\d.]+s\b/.test(line) || /\bno tests ran\b/.test(line))
 ));

 if (!summaryLine) {
 return '';
 }

 return summaryLine.replace(/^=+\s*/, '').replace(/\s*=+$/, '');
}

function extractPytestCount(summary, labelPattern) {
 const match = summary.match(new RegExp(`(\\d+) ${labelPattern}\\b`));
 return match ? parseInt(match[1], 10) : 0;
}

function extractPytestShortSummaryTarget(output, prefix) {
 const line = output
 .split(/\r?\n/)
 .map((entry) => entry.trim())
 .find((entry) => entry.startsWith(`${prefix} `));

 return line ? line.slice(prefix.length + 1).trim() : '';
}

function extractPytestErrorMessage(output, stderr = '') {
 const combined = buildRawOutput(output, stderr);
 const patterns = [
 /^E\s+([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^(ImportError while importing test module .+)$/m,
 /^E\s+(.+)$/m,
 ];

 for (const pattern of patterns) {
 const match = combined.match(pattern);
 if (match) {
 return match[1].trim();
 }
 }

 return 'Pytest error during collection or execution';
}

function parsePytestOutput(stdout = '', stderr = '', exitCode = null) {
 const summary = extractPytestSummary(stdout);
 const rawout = buildRawOutput(stdout, stderr);
 const passed_tests = extractPytestCount(summary, 'passed');
 const failed_tests = extractPytestCount(summary, 'failed');
 const errors = extractPytestCount(summary, 'error(?:s)?');
 const no_tests_collected = exitCode === 5 || /\bno tests ran\b/.test(summary);
 const failures = [];

 const failureBlocks = stdout.split(/={10,} FAILURES ={10,}/)[1]?.split(/={10,}/)[0] || '';
 const matches = [...failureBlocks.matchAll(
 /_{5,}\s*(.*?)\s*_{5,}[\s\S]*?>\s*assert\s+(.*?)\s*?\nE\s+assert\s+(.*?)\s*?(?:\nE\s+\+\s+where\s+(.*?)\s+=)?/g
 )];

 matches.forEach((match, index) => {
 const test_case = match[1]?.trim() || `Test ${index + 1}`;
 const assertionLine = match[2]?.trim();
 const failedExpr = match[3]?.trim();
 const evaluated = match[4]?.trim() || '';

 failures.push({
 test_case,
 expected: failedExpr.split('==')[1]?.trim() || '',
 received: evaluated || failedExpr.split('==')[0]?.trim(),
 error_message: `Assertion failed: ${assertionLine}`,
 rawout,
 });
 });

 if (failed_tests > 0 && failures.length === 0) {
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'FAILED') || 'pytest assertion failure',
 expected: '',
 received: '',
 error_message: 'Pytest reported one or more failed assertions',
 rawout,
 });
 }

 let runtime_error = '';

 if (errors > 0) {
 runtime_error = extractPytestErrorMessage(stdout, stderr);
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'ERROR') || 'pytest collection/execution',
 expected: '',
 received: '',
 error_message: runtime_error,
 rawout,
 });
 } else if (no_tests_collected) {
 runtime_error = 'Pytest did not collect any tests';
 failures.push({
 test_case: 'pytest collection',
 expected: 'at least 1 collected test',
 received: '0 collected tests',
 error_message: runtime_error,
 rawout,
 });
 }

 return {
 tests_run: passed_tests + failed_tests,
 passed: passed_tests,
 failed: failed_tests,
 errors,
 no_tests_collected,
 exit_code: exitCode,
 failure_details: failures,
 runtime_error,
 };
}

function parseCppTestOutput(output, stdout = '', stderr = '') {
 output = output.toString();
 let total_tests = 0;
Expand DownExpand Up@@ -617,7 +479,7 @@ async function executeCode(language, code, stdin, expectedOutput, runTests = fal
 if (runTests && testCode) {
 if (language.toLowerCase() === 'python') {
 executionConfig.runCommand = 'pytest';
 executionConfig.runArgs = [path.join(uniqueDir, 'test_program.py')];
 executionConfig.runArgs = ['-vv', path.join(uniqueDir, 'test_program.py')];
 } else if (language.toLowerCase() === 'cpp') {
 executionConfig.runCommand = path.join(uniqueDir, 'runner');
 executionConfig.runArgs = [];
Expand Down

2 changes: 1 addition & 1 deletion
package.json

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3,7 +3,7 @@
 "version": "1.0.0",
 "main": "index.js",
 "scripts": {
 "test": "node test/cpp-harness.test.js && node test/cpp-result.test.js && node test/cpp-harness-smoke.test.js && node test/executor-response.test.js"
 "test": "node --test"
 },
 "keywords": [],
 "author": "",
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
Improve pytest parsing for beginner-friendly evaluation feedback#25

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Improve pytest parsing for beginner-friendly evaluation feedback
#25
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f559ab1

Improve pytest parsing for beginner-friendly evaluation feedback


NickK21 Jul 19, 2026
a7b42c9

fix(pytest): preserve verbose assertion values


kbuffardi Aug 29, 2026
5d4f7d6

Merge main into beginner-friendly-eval-messages


kbuffardi Aug 29, 2026

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142 changes: 2 additions & 140 deletions
executor.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,7 @@ const { exec, spawn } = require('child_process');
const path = require('path');
const fs = require('fs').promises;
const { v4: uuidv4 } = require('uuid');
const { parsePytestOutput } = require('./pytest-parser');

/**
 * Ensures the datasets repo is cloned or updated in the unique directory.
Expand DownExpand Up@@ -282,145 +283,6 @@ async function handleTestSetup(language, uniqueDir, className, testCode) {
 }
}

/**
 * Parses pytest output to extract structured test results.
 * @param {string} stdout - The stdout from pytest.
 * @param {string} [stderr=''] - The stderr from pytest.
 * @param {number|null} [exitCode=null] - The pytest process exit code.
 * @returns {object} - The test summary.
 */
function buildRawOutput(stdout = '', stderr = '') {
 if (stdout && stderr) {
 return `${stdout}\n${stderr}`;
 }
 return stdout || stderr || '';
}

function extractPytestSummary(output) {
 const lines = output
 .split(/\r?\n/)
 .map((line) => line.trim())
 .filter(Boolean);

 const summaryLine = [...lines].reverse().find((line) => (
 /^=+/.test(line) &&
 /=+$/.test(line) &&
 (/\bin [\d.]+s\b/.test(line) || /\bno tests ran\b/.test(line))
 ));

 if (!summaryLine) {
 return '';
 }

 return summaryLine.replace(/^=+\s*/, '').replace(/\s*=+$/, '');
}

function extractPytestCount(summary, labelPattern) {
 const match = summary.match(new RegExp(`(\\d+) ${labelPattern}\\b`));
 return match ? parseInt(match[1], 10) : 0;
}

function extractPytestShortSummaryTarget(output, prefix) {
 const line = output
 .split(/\r?\n/)
 .map((entry) => entry.trim())
 .find((entry) => entry.startsWith(`${prefix} `));

 return line ? line.slice(prefix.length + 1).trim() : '';
}

function extractPytestErrorMessage(output, stderr = '') {
 const combined = buildRawOutput(output, stderr);
 const patterns = [
 /^E\s+([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^(ImportError while importing test module .+)$/m,
 /^E\s+(.+)$/m,
 ];

 for (const pattern of patterns) {
 const match = combined.match(pattern);
 if (match) {
 return match[1].trim();
 }
 }

 return 'Pytest error during collection or execution';
}

function parsePytestOutput(stdout = '', stderr = '', exitCode = null) {
 const summary = extractPytestSummary(stdout);
 const rawout = buildRawOutput(stdout, stderr);
 const passed_tests = extractPytestCount(summary, 'passed');
 const failed_tests = extractPytestCount(summary, 'failed');
 const errors = extractPytestCount(summary, 'error(?:s)?');
 const no_tests_collected = exitCode === 5 || /\bno tests ran\b/.test(summary);
 const failures = [];

 const failureBlocks = stdout.split(/={10,} FAILURES ={10,}/)[1]?.split(/={10,}/)[0] || '';
 const matches = [...failureBlocks.matchAll(
 /_{5,}\s*(.*?)\s*_{5,}[\s\S]*?>\s*assert\s+(.*?)\s*?\nE\s+assert\s+(.*?)\s*?(?:\nE\s+\+\s+where\s+(.*?)\s+=)?/g
 )];

 matches.forEach((match, index) => {
 const test_case = match[1]?.trim() || `Test ${index + 1}`;
 const assertionLine = match[2]?.trim();
 const failedExpr = match[3]?.trim();
 const evaluated = match[4]?.trim() || '';

 failures.push({
 test_case,
 expected: failedExpr.split('==')[1]?.trim() || '',
 received: evaluated || failedExpr.split('==')[0]?.trim(),
 error_message: `Assertion failed: ${assertionLine}`,
 rawout,
 });
 });

 if (failed_tests > 0 && failures.length === 0) {
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'FAILED') || 'pytest assertion failure',
 expected: '',
 received: '',
 error_message: 'Pytest reported one or more failed assertions',
 rawout,
 });
 }

 let runtime_error = '';

 if (errors > 0) {
 runtime_error = extractPytestErrorMessage(stdout, stderr);
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'ERROR') || 'pytest collection/execution',
 expected: '',
 received: '',
 error_message: runtime_error,
 rawout,
 });
 } else if (no_tests_collected) {
 runtime_error = 'Pytest did not collect any tests';
 failures.push({
 test_case: 'pytest collection',
 expected: 'at least 1 collected test',
 received: '0 collected tests',
 error_message: runtime_error,
 rawout,
 });
 }

 return {
 tests_run: passed_tests + failed_tests,
 passed: passed_tests,
 failed: failed_tests,
 errors,
 no_tests_collected,
 exit_code: exitCode,
 failure_details: failures,
 runtime_error,
 };
}

function parseCppTestOutput(output, stdout = '', stderr = '') {
 output = output.toString();
 let total_tests = 0;
Expand DownExpand Up@@ -617,7 +479,7 @@ async function executeCode(language, code, stdin, expectedOutput, runTests = fal
 if (runTests && testCode) {
 if (language.toLowerCase() === 'python') {
 executionConfig.runCommand = 'pytest';
 executionConfig.runArgs = [path.join(uniqueDir, 'test_program.py')];
 executionConfig.runArgs = ['-vv', path.join(uniqueDir, 'test_program.py')];
 } else if (language.toLowerCase() === 'cpp') {
 executionConfig.runCommand = path.join(uniqueDir, 'runner');
 executionConfig.runArgs = [];
Expand Down

2 changes: 1 addition & 1 deletion
package.json

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3,7 +3,7 @@
 "version": "1.0.0",
 "main": "index.js",
 "scripts": {
 "test": "node test/cpp-harness.test.js && node test/cpp-result.test.js && node test/cpp-harness-smoke.test.js && node test/executor-response.test.js"
 "test": "node --test"
 },
 "keywords": [],
 "author": "",
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Improve pytest parsing for beginner-friendly evaluation feedback#25

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Improve pytest parsing for beginner-friendly evaluation feedback
#25
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f559ab1

Improve pytest parsing for beginner-friendly evaluation feedback


NickK21 Jul 19, 2026
a7b42c9

fix(pytest): preserve verbose assertion values


kbuffardi Aug 29, 2026
5d4f7d6

Merge main into beginner-friendly-eval-messages


kbuffardi Aug 29, 2026

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142 changes: 2 additions & 140 deletions
executor.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,7 @@ const { exec, spawn } = require('child_process');
const path = require('path');
const fs = require('fs').promises;
const { v4: uuidv4 } = require('uuid');
const { parsePytestOutput } = require('./pytest-parser');

/**
 * Ensures the datasets repo is cloned or updated in the unique directory.
Expand DownExpand Up@@ -282,145 +283,6 @@ async function handleTestSetup(language, uniqueDir, className, testCode) {
 }
}

/**
 * Parses pytest output to extract structured test results.
 * @param {string} stdout - The stdout from pytest.
 * @param {string} [stderr=''] - The stderr from pytest.
 * @param {number|null} [exitCode=null] - The pytest process exit code.
 * @returns {object} - The test summary.
 */
function buildRawOutput(stdout = '', stderr = '') {
 if (stdout && stderr) {
 return `${stdout}\n${stderr}`;
 }
 return stdout || stderr || '';
}

function extractPytestSummary(output) {
 const lines = output
 .split(/\r?\n/)
 .map((line) => line.trim())
 .filter(Boolean);

 const summaryLine = [...lines].reverse().find((line) => (
 /^=+/.test(line) &&
 /=+$/.test(line) &&
 (/\bin [\d.]+s\b/.test(line) || /\bno tests ran\b/.test(line))
 ));

 if (!summaryLine) {
 return '';
 }

 return summaryLine.replace(/^=+\s*/, '').replace(/\s*=+$/, '');
}

function extractPytestCount(summary, labelPattern) {
 const match = summary.match(new RegExp(`(\\d+) ${labelPattern}\\b`));
 return match ? parseInt(match[1], 10) : 0;
}

function extractPytestShortSummaryTarget(output, prefix) {
 const line = output
 .split(/\r?\n/)
 .map((entry) => entry.trim())
 .find((entry) => entry.startsWith(`${prefix} `));

 return line ? line.slice(prefix.length + 1).trim() : '';
}

function extractPytestErrorMessage(output, stderr = '') {
 const combined = buildRawOutput(output, stderr);
 const patterns = [
 /^E\s+([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^(ImportError while importing test module .+)$/m,
 /^E\s+(.+)$/m,
 ];

 for (const pattern of patterns) {
 const match = combined.match(pattern);
 if (match) {
 return match[1].trim();
 }
 }

 return 'Pytest error during collection or execution';
}

function parsePytestOutput(stdout = '', stderr = '', exitCode = null) {
 const summary = extractPytestSummary(stdout);
 const rawout = buildRawOutput(stdout, stderr);
 const passed_tests = extractPytestCount(summary, 'passed');
 const failed_tests = extractPytestCount(summary, 'failed');
 const errors = extractPytestCount(summary, 'error(?:s)?');
 const no_tests_collected = exitCode === 5 || /\bno tests ran\b/.test(summary);
 const failures = [];

 const failureBlocks = stdout.split(/={10,} FAILURES ={10,}/)[1]?.split(/={10,}/)[0] || '';
 const matches = [...failureBlocks.matchAll(
 /_{5,}\s*(.*?)\s*_{5,}[\s\S]*?>\s*assert\s+(.*?)\s*?\nE\s+assert\s+(.*?)\s*?(?:\nE\s+\+\s+where\s+(.*?)\s+=)?/g
 )];

 matches.forEach((match, index) => {
 const test_case = match[1]?.trim() || `Test ${index + 1}`;
 const assertionLine = match[2]?.trim();
 const failedExpr = match[3]?.trim();
 const evaluated = match[4]?.trim() || '';

 failures.push({
 test_case,
 expected: failedExpr.split('==')[1]?.trim() || '',
 received: evaluated || failedExpr.split('==')[0]?.trim(),
 error_message: `Assertion failed: ${assertionLine}`,
 rawout,
 });
 });

 if (failed_tests > 0 && failures.length === 0) {
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'FAILED') || 'pytest assertion failure',
 expected: '',
 received: '',
 error_message: 'Pytest reported one or more failed assertions',
 rawout,
 });
 }

 let runtime_error = '';

 if (errors > 0) {
 runtime_error = extractPytestErrorMessage(stdout, stderr);
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'ERROR') || 'pytest collection/execution',
 expected: '',
 received: '',
 error_message: runtime_error,
 rawout,
 });
 } else if (no_tests_collected) {
 runtime_error = 'Pytest did not collect any tests';
 failures.push({
 test_case: 'pytest collection',
 expected: 'at least 1 collected test',
 received: '0 collected tests',
 error_message: runtime_error,
 rawout,
 });
 }

 return {
 tests_run: passed_tests + failed_tests,
 passed: passed_tests,
 failed: failed_tests,
 errors,
 no_tests_collected,
 exit_code: exitCode,
 failure_details: failures,
 runtime_error,
 };
}

function parseCppTestOutput(output, stdout = '', stderr = '') {
 output = output.toString();
 let total_tests = 0;
Expand DownExpand Up@@ -617,7 +479,7 @@ async function executeCode(language, code, stdin, expectedOutput, runTests = fal
 if (runTests && testCode) {
 if (language.toLowerCase() === 'python') {
 executionConfig.runCommand = 'pytest';
 executionConfig.runArgs = [path.join(uniqueDir, 'test_program.py')];
 executionConfig.runArgs = ['-vv', path.join(uniqueDir, 'test_program.py')];
 } else if (language.toLowerCase() === 'cpp') {
 executionConfig.runCommand = path.join(uniqueDir, 'runner');
 executionConfig.runArgs = [];
Expand Down

2 changes: 1 addition & 1 deletion
package.json

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3,7 +3,7 @@
 "version": "1.0.0",
 "main": "index.js",
 "scripts": {
 "test": "node test/cpp-harness.test.js && node test/cpp-result.test.js && node test/cpp-harness-smoke.test.js && node test/executor-response.test.js"
 "test": "node --test"
 },
 "keywords": [],
 "author": "",
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Improve pytest parsing for beginner-friendly evaluation feedback
#25
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f559ab1

Improve pytest parsing for beginner-friendly evaluation feedback


NickK21 Jul 19, 2026
a7b42c9

fix(pytest): preserve verbose assertion values


kbuffardi Aug 29, 2026
5d4f7d6

Merge main into beginner-friendly-eval-messages


kbuffardi Aug 29, 2026

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142 changes: 2 additions & 140 deletions
executor.js

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,7 @@ const { exec, spawn } = require('child_process');
const path = require('path');
const fs = require('fs').promises;
const { v4: uuidv4 } = require('uuid');
const { parsePytestOutput } = require('./pytest-parser');

/**
 * Ensures the datasets repo is cloned or updated in the unique directory.
Expand DownExpand Up@@ -282,145 +283,6 @@ async function handleTestSetup(language, uniqueDir, className, testCode) {
 }
}

/**
 * Parses pytest output to extract structured test results.
 * @param {string} stdout - The stdout from pytest.
 * @param {string} [stderr=''] - The stderr from pytest.
 * @param {number|null} [exitCode=null] - The pytest process exit code.
 * @returns {object} - The test summary.
 */
function buildRawOutput(stdout = '', stderr = '') {
 if (stdout && stderr) {
 return `${stdout}\n${stderr}`;
 }
 return stdout || stderr || '';
}

function extractPytestSummary(output) {
 const lines = output
 .split(/\r?\n/)
 .map((line) => line.trim())
 .filter(Boolean);

 const summaryLine = [...lines].reverse().find((line) => (
 /^=+/.test(line) &&
 /=+$/.test(line) &&
 (/\bin [\d.]+s\b/.test(line) || /\bno tests ran\b/.test(line))
 ));

 if (!summaryLine) {
 return '';
 }

 return summaryLine.replace(/^=+\s*/, '').replace(/\s*=+$/, '');
}

function extractPytestCount(summary, labelPattern) {
 const match = summary.match(new RegExp(`(\\d+) ${labelPattern}\\b`));
 return match ? parseInt(match[1], 10) : 0;
}

function extractPytestShortSummaryTarget(output, prefix) {
 const line = output
 .split(/\r?\n/)
 .map((entry) => entry.trim())
 .find((entry) => entry.startsWith(`${prefix} `));

 return line ? line.slice(prefix.length + 1).trim() : '';
}

function extractPytestErrorMessage(output, stderr = '') {
 const combined = buildRawOutput(output, stderr);
 const patterns = [
 /^E\s+([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^(ImportError while importing test module .+)$/m,
 /^E\s+(.+)$/m,
 ];

 for (const pattern of patterns) {
 const match = combined.match(pattern);
 if (match) {
 return match[1].trim();
 }
 }

 return 'Pytest error during collection or execution';
}

function parsePytestOutput(stdout = '', stderr = '', exitCode = null) {
 const summary = extractPytestSummary(stdout);
 const rawout = buildRawOutput(stdout, stderr);
 const passed_tests = extractPytestCount(summary, 'passed');
 const failed_tests = extractPytestCount(summary, 'failed');
 const errors = extractPytestCount(summary, 'error(?:s)?');
 const no_tests_collected = exitCode === 5 || /\bno tests ran\b/.test(summary);
 const failures = [];

 const failureBlocks = stdout.split(/={10,} FAILURES ={10,}/)[1]?.split(/={10,}/)[0] || '';
 const matches = [...failureBlocks.matchAll(
 /_{5,}\s*(.*?)\s*_{5,}[\s\S]*?>\s*assert\s+(.*?)\s*?\nE\s+assert\s+(.*?)\s*?(?:\nE\s+\+\s+where\s+(.*?)\s+=)?/g
 )];

 matches.forEach((match, index) => {
 const test_case = match[1]?.trim() || `Test ${index + 1}`;
 const assertionLine = match[2]?.trim();
 const failedExpr = match[3]?.trim();
 const evaluated = match[4]?.trim() || '';

 failures.push({
 test_case,
 expected: failedExpr.split('==')[1]?.trim() || '',
 received: evaluated || failedExpr.split('==')[0]?.trim(),
 error_message: `Assertion failed: ${assertionLine}`,
 rawout,
 });
 });

 if (failed_tests > 0 && failures.length === 0) {
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'FAILED') || 'pytest assertion failure',
 expected: '',
 received: '',
 error_message: 'Pytest reported one or more failed assertions',
 rawout,
 });
 }

 let runtime_error = '';

 if (errors > 0) {
 runtime_error = extractPytestErrorMessage(stdout, stderr);
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'ERROR') || 'pytest collection/execution',
 expected: '',
 received: '',
 error_message: runtime_error,
 rawout,
 });
 } else if (no_tests_collected) {
 runtime_error = 'Pytest did not collect any tests';
 failures.push({
 test_case: 'pytest collection',
 expected: 'at least 1 collected test',
 received: '0 collected tests',
 error_message: runtime_error,
 rawout,
 });
 }

 return {
 tests_run: passed_tests + failed_tests,
 passed: passed_tests,
 failed: failed_tests,
 errors,
 no_tests_collected,
 exit_code: exitCode,
 failure_details: failures,
 runtime_error,
 };
}

function parseCppTestOutput(output, stdout = '', stderr = '') {
 output = output.toString();
 let total_tests = 0;
Expand DownExpand Up@@ -617,7 +479,7 @@ async function executeCode(language, code, stdin, expectedOutput, runTests = fal
 if (runTests && testCode) {
 if (language.toLowerCase() === 'python') {
 executionConfig.runCommand = 'pytest';
 executionConfig.runArgs = [path.join(uniqueDir, 'test_program.py')];
 executionConfig.runArgs = ['-vv', path.join(uniqueDir, 'test_program.py')];
 } else if (language.toLowerCase() === 'cpp') {
 executionConfig.runCommand = path.join(uniqueDir, 'runner');
 executionConfig.runArgs = [];
Expand Down

2 changes: 1 addition & 1 deletion
package.json

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3,7 +3,7 @@
 "version": "1.0.0",
 "main": "index.js",
 "scripts": {
 "test": "node test/cpp-harness.test.js && node test/cpp-result.test.js && node test/cpp-harness-smoke.test.js && node test/executor-response.test.js"
 "test": "node --test"
 },
 "keywords": [],
 "author": "",
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
Improve pytest parsing for beginner-friendly evaluation feedback#25

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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 Open

NickK21
wants to merge
3
commits into

base:main
Choose a base branch

from

 Open


Improve pytest parsing for beginner-friendly evaluation feedback
#25
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f559ab1

Improve pytest parsing for beginner-friendly evaluation feedback


NickK21 Jul 19, 2026
a7b42c9

fix(pytest): preserve verbose assertion values


kbuffardi Aug 29, 2026
5d4f7d6

Merge main into beginner-friendly-eval-messages


kbuffardi Aug 29, 2026

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142 changes: 2 additions & 140 deletions
executor.js

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,6 +2,7 @@ const { exec, spawn } = require('child_process');
const path = require('path');
const fs = require('fs').promises;
const { v4: uuidv4 } = require('uuid');
const { parsePytestOutput } = require('./pytest-parser');

/**
 * Ensures the datasets repo is cloned or updated in the unique directory.
Expand DownExpand Up@@ -282,145 +283,6 @@ async function handleTestSetup(language, uniqueDir, className, testCode) {
 }
}

/**
 * Parses pytest output to extract structured test results.
 * @param {string} stdout - The stdout from pytest.
 * @param {string} [stderr=''] - The stderr from pytest.
 * @param {number|null} [exitCode=null] - The pytest process exit code.
 * @returns {object} - The test summary.
 */
function buildRawOutput(stdout = '', stderr = '') {
 if (stdout && stderr) {
 return `${stdout}\n${stderr}`;
 }
 return stdout || stderr || '';
}

function extractPytestSummary(output) {
 const lines = output
 .split(/\r?\n/)
 .map((line) => line.trim())
 .filter(Boolean);

 const summaryLine = [...lines].reverse().find((line) => (
 /^=+/.test(line) &&
 /=+$/.test(line) &&
 (/\bin [\d.]+s\b/.test(line) || /\bno tests ran\b/.test(line))
 ));

 if (!summaryLine) {
 return '';
 }

 return summaryLine.replace(/^=+\s*/, '').replace(/\s*=+$/, '');
}

function extractPytestCount(summary, labelPattern) {
 const match = summary.match(new RegExp(`(\\d+) ${labelPattern}\\b`));
 return match ? parseInt(match[1], 10) : 0;
}

function extractPytestShortSummaryTarget(output, prefix) {
 const line = output
 .split(/\r?\n/)
 .map((entry) => entry.trim())
 .find((entry) => entry.startsWith(`${prefix} `));

 return line ? line.slice(prefix.length + 1).trim() : '';
}

function extractPytestErrorMessage(output, stderr = '') {
 const combined = buildRawOutput(output, stderr);
 const patterns = [
 /^E\s+([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^([A-Za-z_.]+(?:Error|Exception): .+)$/m,
 /^(ImportError while importing test module .+)$/m,
 /^E\s+(.+)$/m,
 ];

 for (const pattern of patterns) {
 const match = combined.match(pattern);
 if (match) {
 return match[1].trim();
 }
 }

 return 'Pytest error during collection or execution';
}

function parsePytestOutput(stdout = '', stderr = '', exitCode = null) {
 const summary = extractPytestSummary(stdout);
 const rawout = buildRawOutput(stdout, stderr);
 const passed_tests = extractPytestCount(summary, 'passed');
 const failed_tests = extractPytestCount(summary, 'failed');
 const errors = extractPytestCount(summary, 'error(?:s)?');
 const no_tests_collected = exitCode === 5 || /\bno tests ran\b/.test(summary);
 const failures = [];

 const failureBlocks = stdout.split(/={10,} FAILURES ={10,}/)[1]?.split(/={10,}/)[0] || '';
 const matches = [...failureBlocks.matchAll(
 /_{5,}\s*(.*?)\s*_{5,}[\s\S]*?>\s*assert\s+(.*?)\s*?\nE\s+assert\s+(.*?)\s*?(?:\nE\s+\+\s+where\s+(.*?)\s+=)?/g
 )];

 matches.forEach((match, index) => {
 const test_case = match[1]?.trim() || `Test ${index + 1}`;
 const assertionLine = match[2]?.trim();
 const failedExpr = match[3]?.trim();
 const evaluated = match[4]?.trim() || '';

 failures.push({
 test_case,
 expected: failedExpr.split('==')[1]?.trim() || '',
 received: evaluated || failedExpr.split('==')[0]?.trim(),
 error_message: `Assertion failed: ${assertionLine}`,
 rawout,
 });
 });

 if (failed_tests > 0 && failures.length === 0) {
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'FAILED') || 'pytest assertion failure',
 expected: '',
 received: '',
 error_message: 'Pytest reported one or more failed assertions',
 rawout,
 });
 }

 let runtime_error = '';

 if (errors > 0) {
 runtime_error = extractPytestErrorMessage(stdout, stderr);
 failures.push({
 test_case: extractPytestShortSummaryTarget(stdout, 'ERROR') || 'pytest collection/execution',
 expected: '',
 received: '',
 error_message: runtime_error,
 rawout,
 });
 } else if (no_tests_collected) {
 runtime_error = 'Pytest did not collect any tests';
 failures.push({
 test_case: 'pytest collection',
 expected: 'at least 1 collected test',
 received: '0 collected tests',
 error_message: runtime_error,
 rawout,
 });
 }

 return {
 tests_run: passed_tests + failed_tests,
 passed: passed_tests,
 failed: failed_tests,
 errors,
 no_tests_collected,
 exit_code: exitCode,
 failure_details: failures,
 runtime_error,
 };
}

function parseCppTestOutput(output, stdout = '', stderr = '') {
 output = output.toString();
 let total_tests = 0;
Expand DownExpand Up@@ -617,7 +479,7 @@ async function executeCode(language, code, stdin, expectedOutput, runTests = fal
 if (runTests && testCode) {
 if (language.toLowerCase() === 'python') {
 executionConfig.runCommand = 'pytest';
 executionConfig.runArgs = [path.join(uniqueDir, 'test_program.py')];
 executionConfig.runArgs = ['-vv', path.join(uniqueDir, 'test_program.py')];
 } else if (language.toLowerCase() === 'cpp') {
 executionConfig.runCommand = path.join(uniqueDir, 'runner');
 executionConfig.runArgs = [];
Expand Down

2 changes: 1 addition & 1 deletion
package.json

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3,7 +3,7 @@
 "version": "1.0.0",
 "main": "index.js",
 "scripts": {
 "test": "node test/cpp-harness.test.js && node test/cpp-result.test.js && node test/cpp-harness-smoke.test.js && node test/executor-response.test.js"
 "test": "node --test"
 },
 "keywords": [],
 "author": "",
Expand Down
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