feat(cli): ads a simple config:init helper + tests

cli.js

@@ -1,3 +1,3 @@
 #!/usr/bin/env node
 
-require('./dist/cli')
+require('./dist/cli').processArgv()

docs/user/config.md

@@ -89,3 +89,19 @@ All options have default values which should fit most of the projects.
 - [**`diagnostics`**: Diagnostics related configuration.](config/diagnostics)
 - [**`babelConfig`**: Babel(Jest) related configuration.](config/babelConfig)
 - [**`stringifyContentPathRegex`**: Configure which file(s) will become a module returning its content.](config/stringifyContentPathRegex)
+
+### Upgrading
+
+You can use the `config:migrate` tool of TSJest CLI if you're coming from an older version to help you migrate your Jest configuration.
+
+<div class="row"><div class="col-md-6" markdown="block">
+If you're using `jest.config.json`:
+```sh
+node ./node_modules/.bin/ts-jest config:migrate jest.config.js
+```
+</div><div class="col-md-6" markdown="block">
+If you're using `jest` config property of `package.json`:
+```sh
+node ./node_modules/.bin/ts-jest config:migrate package.json
+```
+</div></div>

src/cli/cli.spec.ts

@@ -0,0 +1,284 @@
+import { testing } from 'bs-logger'
+import * as _fs from 'fs'
+import { normalize, resolve } from 'path'
+
+import { mocked } from '../__helpers__/mocks'
+import { rootLogger as _rootLogger } from '../util/logger'
+
+import { processArgv } from '.'
+
+// === helpers ================================================================
+jest.mock('../util/logger')
+jest.mock('fs')
+const fs = mocked(_fs)
+const rootLogger = _rootLogger as testing.LoggerMock
+
+const mockWriteStream = () => {
+  return {
+    written: [] as string[],
+    write(text: string) {
+      this.written.push(text)
+    },
+    clear() {
+      this.written = []
+    },
+  }
+}
+
+const mockObject = <T, M>(obj: T, newProps: M): T & M & { mockRestore: () => T } => {
+  const backup: any = Object.create(null)
+
+  Object.keys(newProps).forEach(key => {
+    const desc = (backup[key] = Object.getOwnPropertyDescriptor(obj, key))
+    const newDesc: any = { ...desc }
+    if (newDesc.get) {
+      newDesc.get = () => (newProps as any)[key]
+    } else {
+      newDesc.value = (newProps as any)[key]
+    }
+    Object.defineProperty(obj, key, newDesc)
+  })
+  if ((obj as any).mockRestore) backup.mockRestore = Object.getOwnPropertyDescriptor(obj, 'mockRestore')
+  return Object.defineProperty(obj, 'mockRestore', {
+    value() {
+      Object.keys(backup).forEach(key => {
+        Object.defineProperty(obj, key, backup[key])
+      })
+      return obj
+    },
+    configurable: true,
+  })
+}
+
+let lastExitCode: number | undefined
+
+const runCli = async (
+  ...args: any[]
+): Promise<{ stdout: string; stderr: string; exitCode: number | undefined; log: string }> => {
+  mockedProcess.stderr.clear()
+  mockedProcess.stdout.clear()
+  rootLogger.target.clear()
+  mockedProcess.argv.splice(2, mockedProcess.argv.length - 2, ...args)
+  lastExitCode = undefined
+  await processArgv()
+  return {
+    exitCode: lastExitCode,
+    stdout: mockedProcess.stdout.written.join('\n'),
+    stderr: mockedProcess.stderr.written.join('\n'),
+    log: rootLogger.target.lines.join('\n'),
+  }
+}
+
+let mockedProcess: any
+const FAKE_CWD = normalize('/foo/bar')
+const FAKE_PKG = normalize(`${FAKE_CWD}/package.json`)
+fs.existsSync.mockImplementation(f => f === FAKE_PKG)
+fs.readFileSync.mockImplementation(f => {
+  if (f === FAKE_PKG) return JSON.stringify({ name: 'mock', version: '0.0.0-mock.0' })
+  throw new Error('ENOENT')
+})
+
+// === test ===================================================================
+
+beforeEach(() => {
+  // jest.resetModules()
+  lastExitCode = undefined
+  mockedProcess = mockObject(process, {
+    cwd: () => FAKE_CWD,
+    argv: ['node', resolve(__dirname, '..', '..', 'cli.js')],
+    stderr: mockWriteStream(),
+    stdout: mockWriteStream(),
+    exit: (exitCode = 0) => {
+      lastExitCode = exitCode
+    },
+  })
+  fs.writeFileSync.mockClear()
+  fs.existsSync.mockClear()
+  fs.readFileSync.mockClear()
+  rootLogger.target.clear()
+})
+afterEach(() => {
+  mockedProcess.mockRestore()
+  mockedProcess = undefined
+})
+
+describe('cli', async () => {
+  it('should output usage', async () => {
+    expect.assertions(2)
+    await expect(runCli()).resolves.toMatchInlineSnapshot(`
+Object {
+  "exitCode": 0,
+  "log": "",
+  "stderr": "",
+  "stdout": "
+Usage:
+  ts-jest command [options] [...args]
+
+Commands:
+  config:init           Creates initial Jest configuration
+  config:migrate        Migrates a given Jest configuration
+  help [command]        Show this help, or help about a command
+
+Example:
+  ts-jest help config:migrate
+",
+}
+`)
+    await expect(runCli('hello:motto')).resolves.toMatchInlineSnapshot(`
+Object {
+  "exitCode": 0,
+  "log": "",
+  "stderr": "",
+  "stdout": "
+Usage:
+  ts-jest command [options] [...args]
+
+Commands:
+  config:init           Creates initial Jest configuration
+  config:migrate        Migrates a given Jest configuration
+  help [command]        Show this help, or help about a command
+
+Example:
+  ts-jest help config:migrate
+",
+}
+`)
+  })
+})
+
+describe('config', async () => {
+  // briefly tested, see header comment in `config/init.ts`
+  describe('init', async () => {
+    const noOption = ['config:init']
+    const fullOptions = [
+      ...noOption,
+      '--babel',
+      '--tsconfig',
+      'tsconfig.test.json',
+      '--jsdom',
+      '--no-jest-preset',
+      '--allow-js',
+    ]
+    it('should create a jest.config.json (without options)', async () => {
+      expect.assertions(2)
+      const res = await runCli(...noOption)
+      expect(res).toEqual({
+        exitCode: 0,
+        log: '',
+        stderr: `
+Jest configuration written to "${normalize('/foo/bar/jest.config.js')}".
+`,
+        stdout: '',
+      })
+      expect(fs.writeFileSync.mock.calls).toEqual([
+        [
+          normalize('/foo/bar/jest.config.js'),
+          `module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};`,
+        ],
+      ])
+    })
+    it('should create a jest.config.foo.json (with all options set)', async () => {
+      expect.assertions(2)
+      const res = await runCli(...fullOptions, 'jest.config.foo.js')
+      expect(res).toEqual({
+        exitCode: 0,
+        log: '',
+        stderr: `
+Jest configuration written to "${normalize('/foo/bar/jest.config.foo.js')}".
+`,
+        stdout: '',
+      })
+      expect(fs.writeFileSync.mock.calls).toEqual([
+        [
+          normalize('/foo/bar/jest.config.foo.js'),
+          `const tsJest = require('ts-jest').createJestPreset({ allowJs: true });
+
+module.exports = {
+  ...tsJest,
+  globals: {
+    'ts-jest': {
+      tsconfig: 'tsconfig.test.json',
+      babelConfig: true,
+    },
+  },
+};`,
+        ],
+      ])
+    })
+    it('should update package.json (without options)', async () => {
+      expect.assertions(2)
+      const res = await runCli(...noOption, 'package.json')
+      expect(res).toEqual({
+        exitCode: 0,
+        log: '',
+        stderr: `
+Jest configuration written to "${normalize('/foo/bar/package.json')}".
+`,
+        stdout: '',
+      })
+      expect(fs.writeFileSync.mock.calls).toEqual([
+        [
+          normalize('/foo/bar/package.json'),
+          `{
+  "name": "mock",
+  "version": "0.0.0-mock.0",
+  "jest": {
+    "preset": "ts-jest",
+    "testEnvironment": "node"
+  }
+}`,
+        ],
+      ])
+    })
+    it('should update package.json (with all options set)', async () => {
+      expect.assertions(2)
+      const res = await runCli(...fullOptions, 'package.json')
+      expect(res).toEqual({
+        exitCode: 0,
+        log: `[level:20] creating jest presets handling JavaScript files
+`,
+        stderr: `
+Jest configuration written to "${normalize('/foo/bar/package.json')}".
+`,
+        stdout: '',
+      })
+      expect(fs.writeFileSync.mock.calls).toEqual([
+        [
+          normalize('/foo/bar/package.json'),
+          `{
+  "name": "mock",
+  "version": "0.0.0-mock.0",
+  "jest": {
+    "transform": {
+      "^.+\\\\.[tj]sx?$": "ts-jest"
+    },
+    "testMatch": [
+      "**/__tests__/**/*.js?(x)",
+      "**/?(*.)+(spec|test).js?(x)",
+      "**/__tests__/**/*.ts?(x)",
+      "**/?(*.)+(spec|test).ts?(x)"
+    ],
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "jsx",
+      "node",
+      "ts",
+      "tsx"
+    ],
+    "globals": {
+      "ts-jest": {
+        "tsconfig": "tsconfig.test.json",
+        "babelConfig": true
+      }
+    }
+  }
+}`,
+        ],
+      ])
+    })
+  })
+})