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run_test.js
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run_test.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 {EnvironmentClass} from 'types/Environment';
import type {GlobalConfig, Path, ProjectConfig} from 'types/Config';
import type {Resolver} from 'types/Resolve';
import type {TestFramework} from 'types/TestRunner';
import type {TestResult} from 'types/TestResult';
import type RuntimeClass from 'jest-runtime';
import fs from 'fs';
import {
BufferedConsole,
Console,
NullConsole,
getConsoleOutput,
setGlobal,
} from 'jest-util';
import jasmine2 from 'jest-jasmine2';
import LeakDetector from 'jest-leak-detector';
import {getTestEnvironment} from 'jest-config';
import * as docblock from 'jest-docblock';
type RunTestInternalResult = {
leakDetector: ?LeakDetector,
result: TestResult,
};
// The default jest-runner is required because it is the default test runner
// and required implicitly through the `testRunner` ProjectConfig option.
jasmine2;
// Keeping the core of "runTest" as a separate function (as "runTestInternal")
// is key to be able to detect memory leaks. Since all variables are local to
// the function, when "runTestInternal" finishes its execution, they can all be
// freed, UNLESS something else is leaking them (and that's why we can detect
// the leak!).
//
// If we had all the code in a single function, we should manually nullify all
// references to verify if there is a leak, which is not maintainable and error
// prone. That's why "runTestInternal" CANNOT be inlined inside "runTest".
async function runTestInternal(
path: Path,
globalConfig: GlobalConfig,
config: ProjectConfig,
resolver: Resolver,
): Promise<RunTestInternalResult> {
const testSource = fs.readFileSync(path, 'utf8');
const parsedDocblock = docblock.parse(docblock.extract(testSource));
const customEnvironment = parsedDocblock['jest-environment'];
let testEnvironment = config.testEnvironment;
if (customEnvironment) {
testEnvironment = getTestEnvironment(
Object.assign({}, config, {
testEnvironment: customEnvironment,
}),
);
}
/* $FlowFixMe */
const TestEnvironment = (require(testEnvironment): EnvironmentClass);
/* $FlowFixMe */
const testFramework = (require(config.testRunner): TestFramework);
/* $FlowFixMe */
const Runtime = (require(config.moduleLoader || 'jest-runtime'): Class<
RuntimeClass,
>);
const environment = new TestEnvironment(config);
const leakDetector = config.detectLeaks
? new LeakDetector(environment)
: null;
const consoleOut = globalConfig.useStderr ? process.stderr : process.stdout;
const consoleFormatter = (type, message) =>
getConsoleOutput(
config.cwd,
!!globalConfig.verbose,
// 4 = the console call is buried 4 stack frames deep
BufferedConsole.write([], type, message, 4),
);
let testConsole;
if (globalConfig.silent) {
testConsole = new NullConsole(consoleOut, process.stderr, consoleFormatter);
} else if (globalConfig.verbose) {
testConsole = new Console(consoleOut, process.stderr, consoleFormatter);
} else {
testConsole = new BufferedConsole();
}
const cacheFS = {[path]: testSource};
setGlobal(environment.global, 'console', testConsole);
const runtime = new Runtime(config, environment, resolver, cacheFS, {
collectCoverage: globalConfig.collectCoverage,
collectCoverageFrom: globalConfig.collectCoverageFrom,
collectCoverageOnlyFrom: globalConfig.collectCoverageOnlyFrom,
mapCoverage: globalConfig.mapCoverage,
});
const start = Date.now();
await environment.setup();
try {
const result: TestResult = await testFramework(
globalConfig,
config,
environment,
runtime,
path,
);
const testCount =
result.numPassingTests + result.numFailingTests + result.numPendingTests;
result.perfStats = {end: Date.now(), start};
result.testFilePath = path;
result.coverage = runtime.getAllCoverageInfo();
result.sourceMaps = runtime.getSourceMapInfo();
result.console = testConsole.getBuffer();
result.skipped = testCount === result.numPendingTests;
result.displayName = config.displayName;
if (globalConfig.logHeapUsage) {
if (global.gc) {
global.gc();
}
result.memoryUsage = process.memoryUsage().heapUsed;
}
// Delay the resolution to allow log messages to be output.
return new Promise(resolve => {
setImmediate(() => resolve({leakDetector, result}));
});
} finally {
await environment.teardown();
}
}
export default async function runTest(
path: Path,
globalConfig: GlobalConfig,
config: ProjectConfig,
resolver: Resolver,
): Promise<TestResult> {
const {leakDetector, result} = await runTestInternal(
path,
globalConfig,
config,
resolver,
);
// Resolve leak detector, outside the "runTestInternal" closure.
result.leaks = leakDetector ? leakDetector.isLeaking() : false;
return result;
}