assert: minor error message improvements

Adjust indentations and fix a typo.
PR-URL: #20315
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

Author: BridgeAR

lib/internal/errors.js

@@ -360,13 +360,10 @@ function createErrDiff(actual, expected, operator) {
 
 // Strict equal with identical objects that are not identical by reference.
 if(identical===maxLines){
-letbase='Input object identical but not reference equal:';
-
-if(operator!=='strictEqual'){
-// This code path should not be possible to reach.
-// The output is identical but it is not clear why.
-base='Input objects not identical:';
-}
+// E.g., assert.deepStrictEqual(Symbol(), Symbol())
+constbase=operator==='strictEqual' ?
+'Input objects identical but not reference equal:' :
+'Input objects not identical:';
 
 // We have to get the result again. The lines were all removed before.
 constactualLines=inspectValue(actual);
@@ -380,7 +377,7 @@ function createErrDiff(actual, expected, operator) {
 }
 }
 
-return`${base}\n\n${actualLines.join('\n')}\n`;
+return`${base}\n\n${actualLines.join('\n')}\n`;
 }
 return`${msg}${skipped ? skippedMsg : ''}\n${res}${other}${end}`;
 }
@@ -448,7 +445,7 @@ class AssertionError extends Error {
 if(res.length===1){
 super(`${base}${res[0]}`);
 }else{
-super(`${base}\n\n${res.join('\n')}\n`);
+super(`${base}\n\n${res.join('\n')}\n`);
 }
 }else{
 letres=util.inspect(actual);

test/parallel/test-assert.js

@@ -599,14 +599,13 @@ assert.throws(
 });
 
 // notDeepEqual tests
-message='Identical input passed to notDeepStrictEqual:\n\n'+
-' [\n 1\n ]\n';
+message='Identical input passed to notDeepStrictEqual:\n\n[\n 1\n]\n';
 assert.throws(
 ()=>assert.notDeepEqual([1],[1]),
 { message });
 
 message='Identical input passed to notDeepStrictEqual:'+
-`\n\n[${'\n 1,'.repeat(25)}\n...\n`;
+`\n\n[${'\n 1,'.repeat(25)}\n...\n`;
 constdata=Array(31).fill(1);
 assert.throws(
 ()=>assert.notDeepEqual(data,data),
@@ -901,7 +900,7 @@ assert.throws(() => { throw null; }, 'foo');
 assert.throws(
 ()=>assert.strictEqual([],[]),
 {
-message: 'Input object identical but not reference equal:\n\n[]\n'
+message: 'Input objects identical but not reference equal:\n\n[]\n'
 }
 );