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const { ArrayPrototypeJoin, ArrayPrototypePop, Error, ErrorCaptureStackTrace, MathMax, ObjectCreate, ObjectDefineProperty, ObjectGetPrototypeOf, ObjectKeys, String, StringPrototypeEndsWith, StringPrototypeRepeat, StringPrototypeSlice, StringPrototypeSplit, } = primordials; const { inspect } = require('internal/util/inspect'); const { removeColors, } = require('internal/util'); const { validateObject, } = require('internal/validators'); const { isErrorStackTraceLimitWritable } = require('internal/errors'); let blue = ''; let green = ''; let red = ''; let white = ''; const kReadableOperator = { deepStrictEqual: 'Expected values to be strictly deep-equal:', strictEqual: 'Expected values to be strictly equal:', strictEqualObject: 'Expected "actual" to be reference-equal to "expected":', deepEqual: 'Expected values to be loosely deep-equal:', notDeepStrictEqual: 'Expected "actual" not to be strictly deep-equal to:', notStrictEqual: 'Expected "actual" to be strictly unequal to:', notStrictEqualObject: 'Expected "actual" not to be reference-equal to "expected":', notDeepEqual: 'Expected "actual" not to be loosely deep-equal to:', notIdentical: 'Values have same structure but are not reference-equal:', notDeepEqualUnequal: 'Expected values not to be loosely deep-equal:' }; // Comparing short primitives should just show === / !== instead of using the // diff. const kMaxShortLength = 12; function copyError(source) { const keys = ObjectKeys(source); const target = ObjectCreate(ObjectGetPrototypeOf(source)); for (const key of keys) { target[key] = source[key]; } ObjectDefineProperty(target, 'message', { __proto__: null, value: source.message }); return target; } function inspectValue(val) { // The util.inspect default values could be changed. This makes sure the // error messages contain the necessary information nevertheless. return inspect( val, { compact: false, customInspect: false, depth: 1000, maxArrayLength: Infinity, // Assert compares only enumerable properties (with a few exceptions). showHidden: false, // Assert does not detect proxies currently. showProxy: false, sorted: true, // Inspect getters as we also check them when comparing entries. getters: true, } ); } function createErrDiff(actual, expected, operator) { let other = ''; let res = ''; let end = ''; let skipped = false; const actualInspected = inspectValue(actual); const actualLines = StringPrototypeSplit(actualInspected, '\n'); const expectedLines = StringPrototypeSplit(inspectValue(expected), '\n'); let i = 0; let indicator = ''; // In case both values are objects or functions explicitly mark them as not // reference equal for the `strictEqual` operator. if (operator === 'strictEqual' && ((typeof actual === 'object' && actual !== null && typeof expected === 'object' && expected !== null) || (typeof actual === 'function' && typeof expected === 'function'))) { operator = 'strictEqualObject'; } // If "actual" and "expected" fit on a single line and they are not strictly // equal, check further special handling. if (actualLines.length === 1 && expectedLines.length === 1 && actualLines[0] !== expectedLines[0]) { // Check for the visible length using the `removeColors()` function, if // appropriate. const c = inspect.defaultOptions.colors; const actualRaw = c ? removeColors(actualLines[0]) : actualLines[0]; const expectedRaw = c ? removeColors(expectedLines[0]) : expectedLines[0]; const inputLength = actualRaw.length + expectedRaw.length; // If the character length of "actual" and "expected" together is less than // kMaxShortLength and if neither is an object and at least one of them is // not `zero`, use the strict equal comparison to visualize the output. if (inputLength <= kMaxShortLength) { if ((typeof actual !== 'object' || actual === null) && (typeof expected !== 'object' || expected === null) && (actual !== 0 || expected !== 0)) { // -0 === +0 return `${kReadableOperator[operator]}\n\n` + `${actualLines[0]} !== ${expectedLines[0]}\n`; } } else if (operator !== 'strictEqualObject') { // If the stderr is a tty and the input length is lower than the current // columns per line, add a mismatch indicator below the output. If it is // not a tty, use a default value of 80 characters. const maxLength = process.stderr.isTTY ? process.stderr.columns : 80; if (inputLength < maxLength) { while (actualRaw[i] === expectedRaw[i]) { i++; } // Ignore the first characters. if (i > 2) { // Add position indicator for the first mismatch in case it is a // single line and the input length is less than the column length. indicator = `\n ${StringPrototypeRepeat(' ', i)}^`; i = 0; } } } } // Remove all ending lines that match (this optimizes the output for // readability by reducing the number of total changed lines). let a = actualLines[actualLines.length - 1]; let b = expectedLines[expectedLines.length - 1]; while (a === b) { if (i++ < 3) { end = `\n ${a}${end}`; } else { other = a; } ArrayPrototypePop(actualLines); ArrayPrototypePop(expectedLines); if (actualLines.length === 0 || expectedLines.length === 0) break; a = actualLines[actualLines.length - 1]; b = expectedLines[expectedLines.length - 1]; } const maxLines = MathMax(actualLines.length, expectedLines.length); // Strict equal with identical objects that are not identical by reference. // E.g., assert.deepStrictEqual({ a: Symbol() }, { a: Symbol() }) if (maxLines === 0) { // We have to get the result again. The lines were all removed before. const actualLines = StringPrototypeSplit(actualInspected, '\n'); // Only remove lines in case it makes sense to collapse those. // TODO: Accept env to always show the full error. if (actualLines.length > 50) { actualLines[46] = `${blue}...${white}`; while (actualLines.length > 47) { ArrayPrototypePop(actualLines); } } return `${kReadableOperator.notIdentical}\n\n` + `${ArrayPrototypeJoin(actualLines, '\n')}\n`; } // There were at least five identical lines at the end. Mark a couple of // skipped. if (i >= 5) { end = `\n${blue}...${white}${end}`; skipped = true; } if (other !== '') { end = `\n ${other}${end}`; other = ''; } let printedLines = 0; let identical = 0; const msg = kReadableOperator[operator] + `\n${green}+ actual${white} ${red}- expected${white}`; const skippedMsg = ` ${blue}...${white} Lines skipped`; let lines = actualLines; let plusMinus = `${green}+${white}`; let maxLength = expectedLines.length; if (actualLines.length < maxLines) { lines = expectedLines; plusMinus = `${red}-${white}`; maxLength = actualLines.length; } for (i = 0; i < maxLines; i++) { if (maxLength < i + 1) { // If more than two former lines are identical, print them. Collapse them // in case more than five lines were identical. if (identical > 2) { if (identical > 3) { if (identical > 4) { if (identical === 5) { res += `\n ${lines[i - 3]}`; printedLines++; } else { res += `\n${blue}...${white}`; skipped = true; } } res += `\n ${lines[i - 2]}`; printedLines++; } res += `\n ${lines[i - 1]}`; printedLines++; } // No identical lines before. identical = 0; // Add the expected line to the cache. if (lines === actualLines) { res += `\n${plusMinus} ${lines[i]}`; } else { other += `\n${plusMinus} ${lines[i]}`; } printedLines++; // Only extra actual lines exist // Lines diverge } else { const expectedLine = expectedLines[i]; let actualLine = actualLines[i]; // If the lines diverge, specifically check for lines that only diverge by // a trailing comma. In that case it is actually identical and we should // mark it as such. let divergingLines = actualLine !== expectedLine && (!StringPrototypeEndsWith(actualLine, ',') || StringPrototypeSlice(actualLine, 0, -1) !== expectedLine); // If the expected line has a trailing comma but is otherwise identical, // add a comma at the end of the actual line. Otherwise the output could // look weird as in: // // [ // 1 // No comma at the end! // + 2 // ] // if (divergingLines && StringPrototypeEndsWith(expectedLine, ',') && StringPrototypeSlice(expectedLine, 0, -1) === actualLine) { divergingLines = false; actualLine += ','; } if (divergingLines) { // If more than two former lines are identical, print them. Collapse // them in case more than five lines were identical. if (identical > 2) { if (identical > 3) { if (identical > 4) { if (identical === 5) { res += `\n ${actualLines[i - 3]}`; printedLines++; } else { res += `\n${blue}...${white}`; skipped = true; } } res += `\n ${actualLines[i - 2]}`; printedLines++; } res += `\n ${actualLines[i - 1]}`; printedLines++; } // No identical lines before. identical = 0; // Add the actual line to the result and cache the expected diverging // line so consecutive diverging lines show up as +++--- and not +-+-+-. res += `\n${green}+${white} ${actualLine}`; other += `\n${red}-${white} ${expectedLine}`; printedLines += 2; // Lines are identical } else { // Add all cached information to the result before adding other things // and reset the cache. res += other; other = ''; identical++; // The very first identical line since the last diverging line is be // added to the result. if (identical <= 2) { res += `\n ${actualLine}`; printedLines++; } } } // Inspected object to big (Show ~50 rows max) if (printedLines > 50 && i < maxLines - 2) { return `${msg}${skippedMsg}\n${res}\n${blue}...${white}${other}\n` + `${blue}...${white}`; } } return `${msg}${skipped ? skippedMsg : ''}\n${res}${other}${end}${indicator}`; } function addEllipsis(string) { const lines = StringPrototypeSplit(string, '\n', 11); if (lines.length > 10) { lines.length = 10; return `${ArrayPrototypeJoin(lines, '\n')}\n...`; } else if (string.length > 512) { return `${StringPrototypeSlice(string, 512)}...`; } return string; } class AssertionError extends Error { constructor(options) { validateObject(options, 'options'); const { message, operator, stackStartFn, details, // Compatibility with older versions. stackStartFunction } = options; let { actual, expected } = options; const limit = Error.stackTraceLimit; if (isErrorStackTraceLimitWritable()) Error.stackTraceLimit = 0; if (message != null) { super(String(message)); } else { if (process.stderr.isTTY) { // Reset on each call to make sure we handle dynamically set environment // variables correct. if (process.stderr.hasColors()) { blue = '\u001b[34m'; green = '\u001b[32m'; white = '\u001b[39m'; red = '\u001b[31m'; } else { blue = ''; green = ''; white = ''; red = ''; } } // Prevent the error stack from being visible by duplicating the error // in a very close way to the original in case both sides are actually // instances of Error. if (typeof actual === 'object' && actual !== null && typeof expected === 'object' && expected !== null && 'stack' in actual && actual instanceof Error && 'stack' in expected && expected instanceof Error) { actual = copyError(actual); expected = copyError(expected); } if (operator === 'deepStrictEqual' || operator === 'strictEqual') { super(createErrDiff(actual, expected, operator)); } else if (operator === 'notDeepStrictEqual' || operator === 'notStrictEqual') { // In case the objects are equal but the operator requires unequal, show // the first object and say A equals B let base = kReadableOperator[operator]; const res = StringPrototypeSplit(inspectValue(actual), '\n'); // In case "actual" is an object or a function, it should not be // reference equal. if (operator === 'notStrictEqual' && ((typeof actual === 'object' && actual !== null) || typeof actual === 'function')) { base = kReadableOperator.notStrictEqualObject; } // Only remove lines in case it makes sense to collapse those. // TODO: Accept env to always show the full error. if (res.length > 50) { res[46] = `${blue}...${white}`; while (res.length > 47) { ArrayPrototypePop(res); } } // Only print a single input. if (res.length === 1) { super(`${base}${res[0].length > 5 ? '\n\n' : ' '}${res[0]}`); } else { super(`${base}\n\n${ArrayPrototypeJoin(res, '\n')}\n`); } } else { let res = inspectValue(actual); let other = inspectValue(expected); const knownOperator = kReadableOperator[operator]; if (operator === 'notDeepEqual' && res === other) { res = `${knownOperator}\n\n${res}`; if (res.length > 1024) { res = `${StringPrototypeSlice(res, 0, 1021)}...`; } super(res); } else { if (res.length > 512) { res = `${StringPrototypeSlice(res, 0, 509)}...`; } if (other.length > 512) { other = `${StringPrototypeSlice(other, 0, 509)}...`; } if (operator === 'deepEqual') { res = `${knownOperator}\n\n${res}\n\nshould loosely deep-equal\n\n`; } else { const newOp = kReadableOperator[`${operator}Unequal`]; if (newOp) { res = `${newOp}\n\n${res}\n\nshould not loosely deep-equal\n\n`; } else { other = ` ${operator} ${other}`; } } super(`${res}${other}`); } } } if (isErrorStackTraceLimitWritable()) Error.stackTraceLimit = limit; this.generatedMessage = !message; ObjectDefineProperty(this, 'name', { __proto__: null, value: 'AssertionError [ERR_ASSERTION]', enumerable: false, writable: true, configurable: true }); this.code = 'ERR_ASSERTION'; if (details) { this.actual = undefined; this.expected = undefined; this.operator = undefined; for (let i = 0; i < details.length; i++) { this['message ' + i] = details[i].message; this['actual ' + i] = details[i].actual; this['expected ' + i] = details[i].expected; this['operator ' + i] = details[i].operator; this['stack trace ' + i] = details[i].stack; } } else { this.actual = actual; this.expected = expected; this.operator = operator; } ErrorCaptureStackTrace(this, stackStartFn || stackStartFunction); // Create error message including the error code in the name. this.stack; // eslint-disable-line no-unused-expressions // Reset the name. this.name = 'AssertionError'; } toString() { return `${this.name} [${this.code}]: ${this.message}`; } [inspect.custom](recurseTimes, ctx) { // Long strings should not be fully inspected. const tmpActual = this.actual; const tmpExpected = this.expected; if (typeof this.actual === 'string') { this.actual = addEllipsis(this.actual); } if (typeof this.expected === 'string') { this.expected = addEllipsis(this.expected); } // This limits the `actual` and `expected` property default inspection to // the minimum depth. Otherwise those values would be too verbose compared // to the actual error message which contains a combined view of these two // input values. const result = inspect(this, { ...ctx, customInspect: false, depth: 0 }); // Reset the properties after inspection. this.actual = tmpActual; this.expected = tmpExpected; return result; } } module.exports = AssertionError; |