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assert: fix infinite loop #18611

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assert: fix infinite loop #18611

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155d932
assert: fix infinite loop
BridgeAR Feb 7, 2018
6d0eb21
assert: show proper differences
BridgeAR Feb 7, 2018
da63546
fixup
BridgeAR Feb 10, 2018
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6 changes: 4 additions & 2 deletions lib/internal/errors.js
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Original file line number Diff line number Diff line change
Expand Up @@ -151,9 +151,9 @@ function createErrDiff(actual, expected, operator) {
var skipped = false;
const util = lazyUtil();
const actualLines = util
.inspect(actual, { compact: false }).split('\n');
.inspect(actual, { compact: false, customInspect: false }).split('\n');
const expectedLines = util
.inspect(expected, { compact: false }).split('\n');
.inspect(expected, { compact: false, customInspect: false }).split('\n');
const msg = `Input A expected to ${operator} input B:\n` +
`${green}+ expected${white} ${red}- actual${white}`;
const skippedMsg = ' ... Lines skipped';
Expand All @@ -171,6 +171,8 @@ function createErrDiff(actual, expected, operator) {
}
actualLines.pop();
expectedLines.pop();
if (actualLines.length === 0 || expectedLines.length === 0)
break;
a = actualLines[actualLines.length - 1];
b = expectedLines[expectedLines.length - 1];
}
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16 changes: 16 additions & 0 deletions test/parallel/test-assert.js
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@ const { EOL } = require('os');
const EventEmitter = require('events');
const { errorCache } = require('internal/errors');
const { writeFileSync, unlinkSync } = require('fs');
const { inspect } = require('util');
const a = assert;

function makeBlock(f) {
Expand Down Expand Up @@ -899,6 +900,21 @@ common.expectsError(
() => assert.deepEqual(Array(12).fill(1), Array(12).fill(2)),
{ message });

const obj1 = {};
const obj2 = { loop: 'forever' };
obj2[inspect.custom] = () => '{}';
// No infinite loop and no custom inspect.
assert.throws(() => assert.deepEqual(obj1, obj2), {
message: `${start}\n` +
`${actExp}\n` +
'\n' +
`${minus} {}\n` +
`${plus} {\n` +
`${plus} loop: 'forever',\n` +
`${plus} [Symbol(util.inspect.custom)]: [Function]\n` +
`${plus} }`
});

// notDeepEqual tests
message = 'Identical input passed to notDeepStrictEqual:\n[\n 1\n]';
assert.throws(
Expand Down