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index.js
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/**
* Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import type {Glob, Path} from 'types/Config';
import type {AssertionResult, TestResult} from 'types/TestResult';
import fs from 'fs';
import path from 'path';
import chalk from 'chalk';
import micromatch from 'micromatch';
import slash from 'slash';
import {codeFrameColumns} from '@babel/code-frame';
import StackUtils from 'stack-utils';
// stack utils tries to create pretty stack by making paths relative.
const stackUtils = new StackUtils({
cwd: 'something which does not exist',
});
let nodeInternals = [];
try {
nodeInternals = StackUtils.nodeInternals()
// this is to have the tests be the same in node 4 and node 6.
// TODO: Remove when we drop support for node 4
.concat(new RegExp('internal/process/next_tick.js'));
} catch (e) {
// `StackUtils.nodeInternals()` fails in browsers. We don't need to remove
// node internals in the browser though, so no issue.
}
type StackTraceConfig = {
rootDir: string,
testMatch: Array<Glob>,
};
type StackTraceOptions = {
noStackTrace: boolean,
};
const PATH_NODE_MODULES = `${path.sep}node_modules${path.sep}`;
const PATH_JEST_PACKAGES = `${path.sep}jest${path.sep}packages${path.sep}`;
// filter for noisy stack trace lines
const JASMINE_IGNORE = /^\s+at(?:(?:.*?vendor\/|jasmine\-)|\s+jasmine\.buildExpectationResult)/;
const JEST_INTERNALS_IGNORE = /^\s+at.*?jest(-.*?)?(\/|\\)(build|node_modules|packages)(\/|\\)/;
const ANONYMOUS_FN_IGNORE = /^\s+at <anonymous>.*$/;
const ANONYMOUS_PROMISE_IGNORE = /^\s+at (new )?Promise \(<anonymous>\).*$/;
const ANONYMOUS_GENERATOR_IGNORE = /^\s+at Generator.next \(<anonymous>\).*$/;
const NATIVE_NEXT_IGNORE = /^\s+at next \(native\).*$/;
const TITLE_INDENT = ' ';
const MESSAGE_INDENT = ' ';
const STACK_INDENT = ' ';
const ANCESTRY_SEPARATOR = ' \u203A ';
const TITLE_BULLET = chalk.bold('\u25cf ');
const STACK_TRACE_COLOR = chalk.dim;
const STACK_PATH_REGEXP = /\s*at.*\(?(\:\d*\:\d*|native)\)?/;
const EXEC_ERROR_MESSAGE = 'Test suite failed to run';
const ERROR_TEXT = 'Error: ';
const trim = string => (string || '').trim();
// Some errors contain not only line numbers in stack traces
// e.g. SyntaxErrors can contain snippets of code, and we don't
// want to trim those, because they may have pointers to the column/character
// which will get misaligned.
const trimPaths = string =>
string.match(STACK_PATH_REGEXP) ? trim(string) : string;
const getRenderedCallsite = (
fileContent: string,
line: number,
column?: number,
) => {
let renderedCallsite = codeFrameColumns(
fileContent,
{start: {column, line}},
{highlightCode: true},
);
renderedCallsite = renderedCallsite
.split('\n')
.map(line => MESSAGE_INDENT + line)
.join('\n');
renderedCallsite = `\n${renderedCallsite}\n`;
return renderedCallsite;
};
// ExecError is an error thrown outside of the test suite (not inside an `it` or
// `before/after each` hooks). If it's thrown, none of the tests in the file
// are executed.
export const formatExecError = (
testResult: TestResult,
config: StackTraceConfig,
options: StackTraceOptions,
testPath: Path,
) => {
let error = testResult.testExecError;
if (!error || typeof error === 'number') {
error = new Error(`Expected an Error, but "${String(error)}" was thrown`);
error.stack = '';
}
let {message, stack} = error;
if (typeof error === 'string' || !error) {
error || (error = 'EMPTY ERROR');
message = '';
stack = error;
}
const separated = separateMessageFromStack(stack || '');
stack = separated.stack;
if (separated.message.indexOf(trim(message)) !== -1) {
// Often stack trace already contains the duplicate of the message
message = separated.message;
}
message = message
.split(/\n/)
.map(line => MESSAGE_INDENT + line)
.join('\n');
stack =
stack && !options.noStackTrace
? '\n' + formatStackTrace(stack, config, options, testPath)
: '';
if (message.match(/^\s*$/) && stack.match(/^\s*$/)) {
// this can happen if an empty object is thrown.
message = MESSAGE_INDENT + 'Error: No message was provided';
}
return (
TITLE_INDENT +
TITLE_BULLET +
EXEC_ERROR_MESSAGE +
'\n\n' +
message +
stack +
'\n'
);
};
const removeInternalStackEntries = (lines, options: StackTraceOptions) => {
let pathCounter = 0;
return lines.filter(line => {
if (ANONYMOUS_FN_IGNORE.test(line)) {
return false;
}
if (ANONYMOUS_PROMISE_IGNORE.test(line)) {
return false;
}
if (ANONYMOUS_GENERATOR_IGNORE.test(line)) {
return false;
}
if (NATIVE_NEXT_IGNORE.test(line)) {
return false;
}
if (nodeInternals.some(internal => internal.test(line))) {
return false;
}
if (!STACK_PATH_REGEXP.test(line)) {
return true;
}
if (JASMINE_IGNORE.test(line)) {
return false;
}
if (++pathCounter === 1) {
return true; // always keep the first line even if it's from Jest
}
if (options.noStackTrace) {
return false;
}
if (JEST_INTERNALS_IGNORE.test(line)) {
return false;
}
return true;
});
};
const formatPaths = (
config: StackTraceConfig,
options: StackTraceOptions,
relativeTestPath,
line,
) => {
// Extract the file path from the trace line.
const match = line.match(/(^\s*at .*?\(?)([^()]+)(:[0-9]+:[0-9]+\)?.*$)/);
if (!match) {
return line;
}
let filePath = slash(path.relative(config.rootDir, match[2]));
// highlight paths from the current test file
if (
(config.testMatch &&
config.testMatch.length &&
micromatch(filePath, config.testMatch)) ||
filePath === relativeTestPath
) {
filePath = chalk.reset.cyan(filePath);
}
return STACK_TRACE_COLOR(match[1]) + filePath + STACK_TRACE_COLOR(match[3]);
};
const getTopFrame = (lines: string[]) => {
for (const line of lines) {
if (line.includes(PATH_NODE_MODULES) || line.includes(PATH_JEST_PACKAGES)) {
continue;
}
const parsedFrame = stackUtils.parseLine(line.trim());
if (parsedFrame && parsedFrame.file) {
return parsedFrame;
}
}
return null;
};
export const formatStackTrace = (
stack: string,
config: StackTraceConfig,
options: StackTraceOptions,
testPath: ?Path,
) => {
let lines = stack.split(/\n/);
let renderedCallsite = '';
const relativeTestPath = testPath
? slash(path.relative(config.rootDir, testPath))
: null;
lines = removeInternalStackEntries(lines, options);
const topFrame = getTopFrame(lines);
if (topFrame) {
const filename = topFrame.file;
if (path.isAbsolute(filename)) {
let fileContent;
try {
// TODO: check & read HasteFS instead of reading the filesystem:
// see: https://github.com/facebook/jest/pull/5405#discussion_r164281696
fileContent = fs.readFileSync(filename, 'utf8');
renderedCallsite = getRenderedCallsite(
fileContent,
topFrame.line,
topFrame.column,
);
} catch (e) {
// the file does not exist or is inaccessible, we ignore
}
}
}
const stacktrace = lines
.map(
line =>
STACK_INDENT +
formatPaths(config, options, relativeTestPath, trimPaths(line)),
)
.join('\n');
return renderedCallsite + stacktrace;
};
export const formatResultsErrors = (
testResults: Array<AssertionResult>,
config: StackTraceConfig,
options: StackTraceOptions,
testPath: ?Path,
): ?string => {
const failedResults = testResults.reduce((errors, result) => {
result.failureMessages.forEach(content => errors.push({content, result}));
return errors;
}, []);
if (!failedResults.length) {
return null;
}
return failedResults
.map(({result, content}) => {
let {message, stack} = separateMessageFromStack(content);
stack = options.noStackTrace
? ''
: STACK_TRACE_COLOR(
formatStackTrace(stack, config, options, testPath),
) + '\n';
message = message
.split(/\n/)
.map(line => MESSAGE_INDENT + line)
.join('\n');
const title =
chalk.bold.red(
TITLE_INDENT +
TITLE_BULLET +
result.ancestorTitles.join(ANCESTRY_SEPARATOR) +
(result.ancestorTitles.length ? ANCESTRY_SEPARATOR : '') +
result.title,
) + '\n';
return title + '\n' + message + '\n' + stack;
})
.join('\n');
};
// jasmine and worker farm sometimes don't give us access to the actual
// Error object, so we have to regexp out the message from the stack string
// to format it.
export const separateMessageFromStack = (content: string) => {
if (!content) {
return {message: '', stack: ''};
}
const messageMatch = content.match(/(^(.|\n)*?(?=\n\s*at\s.*\:\d*\:\d*))/);
let message = messageMatch ? messageMatch[0] : 'Error';
const stack = messageMatch ? content.slice(message.length) : content;
// If the error is a plain error instead of a SyntaxError or TypeError
// we remove it from the message because it is generally not useful.
if (message.startsWith(ERROR_TEXT)) {
message = message.substr(ERROR_TEXT.length);
}
return {message, stack};
};