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jest-circus test utils
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‎package.json‎

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"babel-preset-env": "^1.4.0",
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"babel-preset-react": "^6.24.1",
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"babel-preset-react-native": "^4.0.0",
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"babel-register": "^6.26.0",
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"browserify": "^14.4.0",
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"chalk": "^2.0.1",
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"codecov": "^3.0.0",

‎packages/jest-circus/src/__mocks__/test_event_handler.js‎

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/**
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* Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @flow
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*/
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'use strict';
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import type {EventHandler} from 'types/Circus';
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const testHandler: EventHandler = (event, state) => {
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switch (event.name) {
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case 'start_describe_definition': {
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console.log(event.name + ':', event.blockName);
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break;
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}
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case 'run_describe_start':
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case 'run_describe_finish': {
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console.log(event.name + ':', event.describeBlock.name);
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break;
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}
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case 'test_start':
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case 'test_done': {
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console.log(event.name + ':', event.test.name);
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break;
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}
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case 'add_test': {
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console.log(event.name + ':', event.testName);
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break;
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}
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case 'test_fn_start':
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case 'test_fn_success':
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case 'test_fn_failure': {
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console.log(event.name + ':', event.test.name);
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break;
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}
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case 'add_hook': {
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console.log(event.name + ':', event.hookType);
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break;
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}
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case 'hook_start':
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case 'hook_success':
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case 'hook_failure': {
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console.log(event.name + ':', event.hook.type);
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break;
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}
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default: {
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console.log(event.name);
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}
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}
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};
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export default testHandler;

‎packages/jest-circus/src/__mocks__/test_utils.js‎

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/**
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* Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @flow
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*/
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'use strict';
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import {spawnSync} from 'child_process';
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import fs from 'fs';
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import os from 'os';
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import path from 'path';
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const CIRCUS_PATH = path.resolve(__dirname, '../../build/index');
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const CIRCUS_RUN_PATH = path.resolve(__dirname, '../../build/run');
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const CIRCUS_STATE_PATH = path.resolve(__dirname, '../../build/state');
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const TEST_EVENT_HANDLER_PATH = path.resolve(__dirname, './test_event_handler');
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const BABEL_REGISTER_PATH = path.resolve(
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__dirname,
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'../../../../node_modules/babel-register',
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);
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export const runTest = (source: string) => {
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const tmpFilename = path.join(os.tmpdir(), 'circus-test-file.js');
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const content = `
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require('${BABEL_REGISTER_PATH}');
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const circus = require('${CIRCUS_PATH}');
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global.test = circus.test;
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global.describe = circus.describe;
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global.beforeEach = circus.beforeEach;
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global.afterEach = circus.afterEach;
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global.beforeAll = circus.beforeAll;
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global.afterAll = circus.afterAll;
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const testEventHandler = require('${TEST_EVENT_HANDLER_PATH}').default;
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const addEventHandler = require('${CIRCUS_STATE_PATH}').addEventHandler;
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addEventHandler(testEventHandler);
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${source};
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const run = require('${CIRCUS_RUN_PATH}').default;
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run();
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`;
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fs.writeFileSync(tmpFilename, content);
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const result = spawnSync('node', [tmpFilename], {cwd: process.cwd()});
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if (result.status !== 0) {
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const message = `
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STDOUT: ${result.stdout && result.stdout.toString()}
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STDERR: ${result.stderr && result.stderr.toString()}
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STATUS: ${result.status}
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ERROR: ${String(result.error)}
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`;
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throw new Error(message);
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}
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result.stdout = String(result.stdout);
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result.stderr = String(result.stderr);
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if (result.stderr) {
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throw new Error(
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`
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Unexpected stderr:
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${result.stderr}
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`,
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);
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}
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return result;
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};

‎packages/jest-circus/src/__tests__/__snapshots__/hooks.test.js.snap‎

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// Jest Snapshot v1, https://goo.gl/fbAQLP
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exports[`beforeEach is executed before each test in current/child describe blocks 1`] = `
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"start_describe_definition: describe
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add_hook: beforeEach
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add_test: one
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add_test: two
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start_describe_definition: 2nd level describe
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add_hook: beforeEach
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add_test: 2nd level test
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start_describe_definition: 3rd level describe
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add_test: 3rd level test
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add_test: 3rd level test#2
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finish_describe_definition
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finish_describe_definition
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finish_describe_definition
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start_describe_definition: 2nd describe
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add_hook: beforeEach
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add_test: 2nd describe test
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finish_describe_definition
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run_start
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run_describe_start: ROOT_DESCRIBE_BLOCK
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run_describe_start: describe
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hook_start: beforeEach
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hook_success: beforeEach
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test_start: one
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test_success
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hook_start: beforeEach
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hook_success: beforeEach
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test_start: two
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test_success
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run_describe_start: 2nd level describe
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hook_start: beforeEach
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hook_success: beforeEach
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hook_start: beforeEach
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hook_success: beforeEach
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test_start: 2nd level test
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test_success
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run_describe_start: 3rd level describe
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hook_start: beforeEach
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hook_success: beforeEach
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hook_start: beforeEach
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hook_success: beforeEach
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test_start: 3rd level test
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test_success
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hook_start: beforeEach
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hook_success: beforeEach
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hook_start: beforeEach
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hook_success: beforeEach
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test_start: 3rd level test#2
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test_success
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run_describe_finish: 3rd level describe
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run_describe_finish: 2nd level describe
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run_describe_finish: describe
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run_describe_start: 2nd describe
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hook_start: beforeEach
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hook_failure: beforeEach
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test_start: 2nd describe test
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test_success
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run_describe_finish: 2nd describe
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run_describe_finish: ROOT_DESCRIBE_BLOCK
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run_finish
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"
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`;

‎packages/jest-circus/src/__tests__/hooks.test.js‎

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/**
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* Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @flow
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*/
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'use strict';
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import {runTest} from '../__mocks__/test_utils';
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test('beforeEach is executed before each test in current/child describe blocks', () => {
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const {stdout} = runTest(`
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describe('describe', () => {
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beforeEach(() => {});
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test('one', () => {});
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test('two', () => {});
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describe('2nd level describe', () => {
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beforeEach(() => {});
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test('2nd level test', () => {});
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describe('3rd level describe', () => {
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test('3rd level test', () => {});
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test('3rd level test#2', () => {});
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});
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});
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})
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describe('2nd describe', () => {
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beforeEach(() => { throw new Error('alabama'); });
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test('2nd describe test', () => {});
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})
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`);
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expect(stdout).toMatchSnapshot();
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});

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