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harness.js
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harness.js
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'use strict';
const {
ArrayPrototypeForEach,
SafeMap,
SafeWeakSet,
} = primordials;
const {
createHook,
executionAsyncId,
} = require('async_hooks');
const {
codes: {
ERR_TEST_FAILURE,
},
} = require('internal/errors');
const { exitCodes: { kGenericUserError } } = internalBinding('errors');
const { kEmptyObject } = require('internal/util');
const { getOptionValue } = require('internal/options');
const { kCancelledByParent, Test, ItTest, Suite } = require('internal/test_runner/test');
const { setupTestReporters } = require('internal/test_runner/utils');
const { bigint: hrtime } = process.hrtime;
const isTestRunnerCli = getOptionValue('--test');
const testResources = new SafeMap();
const wasRootSetup = new SafeWeakSet();
function createTestTree(options = kEmptyObject) {
return setup(new Test({ __proto__: null, ...options, name: '<root>' }));
}
function createProcessEventHandler(eventName, rootTest) {
return (err) => {
// Check if this error is coming from a test. If it is, fail the test.
const test = testResources.get(executionAsyncId());
if (!test) {
throw err;
}
if (test.finished) {
// If the test is already finished, report this as a top level
// diagnostic since this is a malformed test.
const msg = `Warning: Test "${test.name}" generated asynchronous ` +
'activity after the test ended. This activity created the error ' +
`"${err}" and would have caused the test to fail, but instead ` +
`triggered an ${eventName} event.`;
rootTest.diagnostic(msg);
process.exitCode = kGenericUserError;
return;
}
test.fail(new ERR_TEST_FAILURE(err, eventName));
test.postRun();
};
}
function configureCoverage(rootTest) {
if (!getOptionValue('--experimental-test-coverage')) {
return null;
}
const { setupCoverage } = require('internal/test_runner/coverage');
try {
return setupCoverage();
} catch (err) {
const msg = `Warning: Code coverage could not be enabled. ${err}`;
rootTest.diagnostic(msg);
process.exitCode = kGenericUserError;
}
}
function collectCoverage(rootTest, coverage) {
if (!coverage) {
return null;
}
let summary = null;
try {
summary = coverage.summary();
coverage.cleanup();
} catch (err) {
const op = summary ? 'clean up' : 'report';
const msg = `Warning: Could not ${op} code coverage. ${err}`;
rootTest.diagnostic(msg);
process.exitCode = kGenericUserError;
}
return summary;
}
function setup(root) {
if (wasRootSetup.has(root)) {
return root;
}
const hook = createHook({
init(asyncId, type, triggerAsyncId, resource) {
if (resource instanceof Test) {
testResources.set(asyncId, resource);
return;
}
const parent = testResources.get(triggerAsyncId);
if (parent !== undefined) {
testResources.set(asyncId, parent);
}
},
destroy(asyncId) {
testResources.delete(asyncId);
}
});
hook.enable();
const exceptionHandler =
createProcessEventHandler('uncaughtException', root);
const rejectionHandler =
createProcessEventHandler('unhandledRejection', root);
const coverage = configureCoverage(root);
const exitHandler = () => {
root.coverage = collectCoverage(root, coverage);
root.postRun(new ERR_TEST_FAILURE(
'Promise resolution is still pending but the event loop has already resolved',
kCancelledByParent));
hook.disable();
process.removeListener('unhandledRejection', rejectionHandler);
process.removeListener('uncaughtException', exceptionHandler);
};
const terminationHandler = () => {
exitHandler();
process.exit();
};
process.on('uncaughtException', exceptionHandler);
process.on('unhandledRejection', rejectionHandler);
process.on('beforeExit', exitHandler);
// TODO(MoLow): Make it configurable to hook when isTestRunnerCli === false.
if (isTestRunnerCli) {
process.on('SIGINT', terminationHandler);
process.on('SIGTERM', terminationHandler);
}
root.startTime = hrtime();
wasRootSetup.add(root);
return root;
}
let globalRoot;
function getGlobalRoot() {
if (!globalRoot) {
globalRoot = createTestTree();
globalRoot.reporter.once('test:fail', () => {
process.exitCode = kGenericUserError;
});
setupTestReporters(globalRoot.reporter);
}
return globalRoot;
}
function test(name, options, fn) {
const subtest = getGlobalRoot().createSubtest(Test, name, options, fn);
return subtest.start();
}
function runInParentContext(Factory) {
function run(name, options, fn, overrides) {
const parent = testResources.get(executionAsyncId()) || getGlobalRoot();
const subtest = parent.createSubtest(Factory, name, options, fn, overrides);
if (parent === getGlobalRoot()) {
subtest.start();
}
}
const cb = (name, options, fn) => {
run(name, options, fn);
};
ArrayPrototypeForEach(['skip', 'todo'], (keyword) => {
cb[keyword] = (name, options, fn) => {
run(name, options, fn, { [keyword]: true });
};
});
return cb;
}
function hook(hook) {
return (fn, options) => {
const parent = testResources.get(executionAsyncId()) || getGlobalRoot();
parent.createHook(hook, fn, options);
};
}
module.exports = {
createTestTree,
test,
describe: runInParentContext(Suite),
it: runInParentContext(ItTest),
before: hook('before'),
after: hook('after'),
beforeEach: hook('beforeEach'),
afterEach: hook('afterEach'),
};