Fixed unquoted 'php -S' arguments, port lookups that could terminate the wrong process and partial response queueing.

[AlexSkrypnyk]

Summary

PhpServerContext::start() passes the server address and webroot to php -S through escapeshellarg(), listPortProcesses() returns only sockets listening on exactly the requested port, freePort() succeeds when no process holds the port any longer, PUT /admin/responses in apiserver/index.php queues a payload only when it is a JSON array of JSON objects that all validate, and ApiServerContext::apiWillRespondWithJson() throws when json_validate() rejects its body.

A webroot containing a space or a quote split into several shell arguments, so the server never started. Freeing port 80 ran grep ':80', which also matched a PHP server listening on 8080 and could select it for termination, and when no PHP listener matched, a retry without grep 'LISTEN' could terminate a PHP client connected to the port. When the listener exited between the port check and the lookup, getPid() threw and stop() failed although the port was free. A PUT /admin/responses payload with an invalid second response returned 400 but kept the first one queued, {} returned 201 with nothing queued, and a single response object returned a 500 TypeError. A typo in the JSON of API will respond with JSON: queued a null body and the step passed.

After merge, a failed API will respond with: step carries the server's reason, such as Failed to set the API response: Invalid response #1 payload: Response code must be a number between 100 and 599., both count assertion steps fail with Failed to fetch the API server status. when /admin/status errors instead of Expected 3 queued responses, got ., apiIsRunning() throws \RuntimeException like the other steps, webroot must be a directory and a fixture response must be a file. Step phrases, context options and the "headers": [] that prepareResponse() sends for a response without headers are unchanged, and the api_server_state.<timestamp>.ser file the API server writes to the system temp directory on each start is still never removed.

Before / After

php -S command for a webroot of /srv/my webroot

BEFORE  php -S 127.0.0.1:8888 -t /srv/my webroot
                                 └──┬──┘ └──┬──┘
                                    │       └─ extra argument
                                    └─ document root /srv/my

AFTER   php -S '127.0.0.1:8888' -t '/srv/my webroot'
                                   └───────┬───────┘
                                           └─ one argument

freePort(80) with PHP servers listening on 8080 and on 80

BEFORE  grep ':80' | grep 'LISTEN'
          php 11111  TCP *:8080 (LISTEN)  ◀── first match, terminated
          php 33333  TCP *:80 (LISTEN)
AFTER   /:80\s.*\bLISTEN\b/
          php 11111  TCP *:8080 (LISTEN)      skipped
          php 33333  TCP *:80 (LISTEN)    ◀── terminated

freePort(80) with nginx listening on 80 and a PHP client connected to it

BEFORE  no PHP line has LISTEN, so the lookup retries without grep 'LISTEN'
          php 22222  TCP 127.0.0.1:52345->127.0.0.1:80 (ESTABLISHED)
                                          ◀── terminated
AFTER   no PHP line has LISTEN and nothing is retried
          nothing terminated, stop() reports the port as still in use

PUT /admin/responses

payload                   BEFORE                           AFTER
[{valid}, {invalid}]      400, {valid} stays queued        400, queue unchanged
{}                        201, nothing queued              400
{"code": 200}             500 TypeError                    400
[[]]                      201, a default response queued   400

Changes

Server start and port handling (src/DrevOps/BehatPhpServer/PhpServerContext.php)

• start() passes host:port and webroot through escapeshellarg().
• The constructor requires webroot to pass is_dir().
• listPortProcesses() runs the listing command once and keeps only lines matching /:<port>\s.*\bLISTEN\b/.
• freePort() returns !isPortInUse() when getPid() finds no process, and otherwise terminates the process and returns whether the port is free. getPid() documents the \RuntimeException it throws.

Mock API server (apiserver/index.php)

• PUT /admin/responses decodes the payload without associative conversion, refuses anything other than a JSON array of JSON objects with 400, converts a headers object to an array, and queues the responses only after all of them validate.
• handleResponse() has a docblock summary distinct from sendResponse().

Steps (src/DrevOps/BehatPhpServer/ApiServerContext.php)

• apiWillRespondWithJson() throws \InvalidArgumentException('Body must be valid JSON.') when json_validate() fails.
• apiWillRespondWithFile() requires the fixture path to pass is_file().
• apiWillRespondWith() appends the server's reason phrase to its failure message.
• apiShouldHaveQueuedResponses() and apiShouldHaveReceivedRequests() check the /admin/status status code.
• apiIsRunning() throws \RuntimeException.

Tests (tests/phpunit/Unit/)

• PhpServerContextTest covers the quoted command in testStartQuotesCommandArguments(), exact listening-port matching for lsof and netstat records in testListPortProcesses(), freePort() without an identifiable process in testFreePortWithoutProcess(), and a webroot that is a file. The ESTABLISHED cases of the getPidLsof() and getPidNetstat() providers expect no PID.
• ApiServerContextTest covers invalid JSON, a fixture path that is a directory, the reason phrase in apiWillRespondWith() failures, and a failed /admin/status in both count steps.
• ApiServerTest asserts that a refused payload leaves the queue unchanged, refuses {}, [[]] and a single response object, and keeps "headers": [] accepted.
• ResponseTest::dataProviderFromArray() cases are named, and the expected response no longer passes a Content-Length that the constructor replaces. 2 ApiServerContextTest tests use early exits, and 3 test docblock lines fit the comment width.

Documentation

• README.md documents the JSON error body, the 400 for an invalid PUT /admin/responses payload with none of its responses queued and the webroot directory requirement, and states that headers must be an object with scalar values.
• AGENTS.md lists tests/behat/bootstrap/FeatureContext.php in the layout.
• UPGRADE.md adds the invalid JSON change to the 2.x to 3.0 guide and realigns the method rename table.

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📒 Files selected for processing (4)

• apiserver/index.php
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• tests/phpunit/Unit/ApiServerTest.php
• tests/phpunit/Unit/PhpServerContextTest.php

📝 Walkthrough

Walkthrough

The pull request tightens API response validation, improves Behat context error handling, validates PHP server inputs and port detection, and updates related documentation and PHPUnit coverage.

Changes

Validation and server behavior

Layer / File(s)	Summary
API response validation apiserver/index.php, src/.../Response.php, tests/phpunit/Unit/ApiServerTest.php, tests/phpunit/Unit/ResponseTest.php, README.md	Response payloads must be lists with valid entries. Validation completes before queue changes. Error responses document status and JSON messages.
API context error handling src/.../ApiServerContext.php, tests/phpunit/Unit/ApiServerContextTest.php, UPGRADE.md, AGENTS.md, tests/phpunit/Unit/BehatDistConfigTest.php	JSON, fixture, and status checks now use explicit validation and runtime exceptions. Tests and upgrade documentation cover the updated behavior and method names.
PHP server process handling src/.../PhpServerContext.php, tests/phpunit/Unit/PhpServerContextTest.php, README.md	The server requires a directory webroot, quotes command arguments, verifies port processes precisely, and continues port checks after termination attempts.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Merge Risk: 🟡 Moderate · up to d2eef

Server cleanup can kill an unrelated PHP process or report failure after the port is already free, and malformed response payloads can be accepted. These issues should be fixed before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes: PHP server argument quoting, exact port matching, atomic response queue validation, and API documentation updates.
Docstring Coverage	✅ Passed	Docstring coverage is 97.56% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 41 functions across 8 files. (3 skipped: 3 …
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.25%. Comparing base (67c2890) to head (2594d20).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
+ Coverage   96.20%   96.25%   +0.04%     
==========================================
  Files           3        3              
  Lines         422      427       +5     
==========================================
+ Hits          406      411       +5     
  Misses         16       16              

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Inline comments:
In `@apiserver/index.php`:
- Line 233: Update the PUT /admin/responses request parsing and validation to
preserve JSON object-versus-array types by decoding without associative
conversion. Reject an empty JSON object and response entries whose headers are
JSON arrays with 400 responses, then normalize only validated JSON objects
before passing them to Response::fromArray(). Add regression coverage for {} and
a response containing "headers":[].

In `@src/DrevOps/BehatPhpServer/PhpServerContext.php`:
- Line 581: Update the PID-selection flow around listPortProcesses(),
getPidLsof(), and getPidNetstat() so every candidate remains constrained to a
LISTENING socket. Remove the retry path triggered by $lines === [] or ensure it
parses only the local listening endpoint, preventing freePort() from terminating
unrelated PHP client processes.
- Around line 323-331: Update freePort() to handle getPid() returning no PID
after the listener has already exited: check isPortInUse() and return success
when the port is free, while preserving failure behavior when it remains in use.
Keep other exception handling unchanged.

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📒 Files selected for processing (11)

• AGENTS.md
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• tests/phpunit/Unit/ApiServerContextTest.php
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• tests/phpunit/Unit/ResponseTest.php

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Code Coverage Report:
  2026-09-15 05:00:51

 Summary:
  Classes: 40.00% (2/5)
  Methods: 77.27% (34/44)
  Lines:   93.97% (405/431)

DrevOps\BehatPhpServer\ApiServerContext
  Methods:  75.00% ( 9/12)   Lines:  95.93% (118/123)
DrevOps\BehatPhpServer\ApiServer\ApiServer
  Methods:  70.00% ( 7/10)   Lines:  88.30% ( 83/ 94)
DrevOps\BehatPhpServer\ApiServer\Request
  Methods: 100.00% ( 1/ 1)   Lines: 100.00% (  1/  1)
DrevOps\BehatPhpServer\ApiServer\Response
  Methods: 100.00% ( 4/ 4)   Lines: 100.00% ( 39/ 39)
DrevOps\BehatPhpServer\PhpServerContext
  Methods:  76.47% (13/17)   Lines:  95.35% (164/172)