test(create-app): add integration tests

packages/create-app/__tests__/cli.spec.ts

@@ -0,0 +1,86 @@
+/* eslint-disable node/no-extraneous-import */
+import { commandSync, ExecaSyncReturnValue, SyncOptions } from 'execa'
+import { mkdirpSync, readdirSync, remove, writeFileSync } from 'fs-extra'
+import { join } from 'path'
+
+const CLI_PATH = join(__dirname, '..')
+
+const projectName = 'test-app'
+const genPath = join(__dirname, projectName)
+
+const run = (
+  args: string[],
+  options: SyncOptions<string> = {}
+): ExecaSyncReturnValue<string> => {
+  return commandSync(`node ${CLI_PATH} ${args.join(' ')}`, options)
+}
+
+// Helper to create a non-empty directory
+const createNonEmptyDir = () => {
+  // Create the temporary directory
+  mkdirpSync(genPath)
+
+  // Create a package.json file
+  const pkgJson = join(genPath, 'package.json')
+  writeFileSync(pkgJson, '{ "foo": "bar" }')
+}
+
+// Vue 3 starter template
+const templateFiles = readdirSync(join(CLI_PATH, 'template-vue'))
+  // _gitignore is renamed to .gitignore
+  .map((filePath) => (filePath === '_gitignore' ? '.gitignore' : filePath))
+  .sort()
+
+beforeAll(() => remove(genPath))
+afterEach(() => remove(genPath))
+
+test('prompts for the project name if none supplied', () => {
+  const { stdout, exitCode } = run([])
+  expect(stdout).toContain('Project name:')
+})
+
+test('prompts for the framework if none supplied', () => {
+  const { stdout } = run([projectName])
+  expect(stdout).toContain('Select a framework:')
+})
+
+test('prompts for the framework on supplying an invalid template', () => {
+  const { stdout } = run([projectName, '--template', 'unknown'])
+  expect(stdout).toContain(
+    `unknown isn't a valid template. Please choose from below:`
+  )
+})
+
+test('asks to overwrite non-empty target directory', () => {
+  createNonEmptyDir()
+  const { stdout } = run([projectName], { cwd: __dirname })
+  expect(stdout).toContain(`Target directory ${projectName} is not empty.`)
+})
+
+test('asks to overwrite non-empty current directory', () => {
+  createNonEmptyDir()
+  const { stdout } = run(['.'], { cwd: genPath, input: 'test-app\n' })
+  expect(stdout).toContain(`Current directory is not empty.`)
+})
+
+test('successfully scaffolds a project based on vue starter template', () => {
+  const { stdout } = run([projectName, '--template', 'vue'], {
+    cwd: __dirname
+  })
+  const generatedFiles = readdirSync(genPath).sort()
+
+  // Assertions
+  expect(stdout).toContain(`Scaffolding project in ${genPath}`)
+  expect(templateFiles).toEqual(generatedFiles)
+})
+
+test('works with the -t alias', () => {
+  const { stdout } = run([projectName, '-t', 'vue'], {
+    cwd: __dirname
+  })
+  const generatedFiles = readdirSync(genPath).sort()
+
+  // Assertions
+  expect(stdout).toContain(`Scaffolding project in ${genPath}`)
+  expect(templateFiles).toEqual(generatedFiles)
+})