test: add test for the init command

Author: satya164

packages/react-native-builder-bob/package.json

@@ -85,6 +85,7 @@
     "@types/yargs": "^17.0.10",
     "concurrently": "^7.2.2",
     "jest": "^29.7.0",
-    "mock-fs": "^5.2.0"
+    "mock-fs": "^5.2.0",
+    "mock-stdin": "^1.0.0"
   }
 }

packages/react-native-builder-bob/src/__tests__/__snapshots__/init.test.ts.snap

@@ -0,0 +1,97 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`initializes the configuration 1`] = `
+"{
+  "name": "library",
+  "version": "1.0.0",
+  "devDependencies": {
+    "react-native-builder-bob": "^0.38.1"
+  },
+  "source": "./src/index.ts",
+  "main": "./lib/commonjs/index.js",
+  "module": "./lib/module/index.js",
+  "types": "./lib/typescript/commonjs/src/index.d.ts",
+  "exports": {
+    ".": {
+      "import": {
+        "types": "./lib/typescript/module/src/index.d.ts",
+        "default": "./lib/module/index.js"
+      },
+      "require": {
+        "types": "./lib/typescript/commonjs/src/index.d.ts",
+        "default": "./lib/commonjs/index.js"
+      }
+    }
+  },
+  "scripts": {
+    "prepare": "bob build"
+  },
+  "files": [
+    "src",
+    "lib",
+    "!**/__tests__",
+    "!**/__fixtures__",
+    "!**/__mocks__"
+  ],
+  "react-native-builder-bob": {
+    "source": "src",
+    "output": "lib",
+    "targets": [
+      [
+        "module",
+        {
+          "esm": true
+        }
+      ],
+      [
+        "commonjs",
+        {
+          "esm": true
+        }
+      ],
+      [
+        "typescript",
+        {
+          "esm": true
+        }
+      ]
+    ]
+  },
+  "eslintIgnore": [
+    "node_modules/",
+    "lib/"
+  ]
+}
+"
+`;
+
+exports[`initializes the configuration 2`] = `
+"{
+  "compilerOptions": {
+    "rootDir": ".",
+    "allowUnreachableCode": false,
+    "allowUnusedLabels": false,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "jsx": "react-jsx",
+    "lib": [
+      "ESNext"
+    ],
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitReturns": true,
+    "noImplicitUseStrict": false,
+    "noStrictGenericChecks": false,
+    "noUncheckedIndexedAccess": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "resolveJsonModule": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "target": "ESNext",
+    "verbatimModuleSyntax": true
+  }
+}
+"
+`;

…-builder-bob/src/__tests__/index.test.ts …-builder-bob/src/__tests__/babel.test.tspackages/react-native-builder-bob/src/__tests__/index.test.ts renamed to packages/react-native-builder-bob/src/__tests__/babel.test.ts packages/react-native-builder-bob/src/__tests__/index.test.ts renamed to packages/react-native-builder-bob/src/__tests__/babel.test.ts

@@ -0,0 +1,116 @@
+import { afterEach, beforeEach, expect, it, jest } from '@jest/globals';
+import { readFile } from 'fs-extra';
+import mockFs from 'mock-fs';
+import { stdin } from 'mock-stdin';
+import { join } from 'path';
+import { init } from '../init';
+
+let io: ReturnType<typeof stdin> | undefined;
+
+const root = '/path/to/library';
+
+const enter = '\x0D';
+
+const waitFor = async (callback: () => void) => {
+  const interval = 10;
+
+  let timeout = 50;
+
+  return new Promise((resolve, reject) => {
+    const intervalId = setInterval(() => {
+      try {
+        callback();
+        clearInterval(intervalId);
+        resolve(undefined);
+      } catch (error) {
+        if (timeout <= 0) {
+          clearInterval(intervalId);
+          reject(error);
+        }
+
+        timeout -= interval;
+      }
+    }, interval);
+  });
+};
+
+beforeEach(() => {
+  io = stdin();
+
+  mockFs({
+    [root]: {
+      'package.json': JSON.stringify({
+        name: 'library',
+        version: '1.0.0',
+      }),
+      'src': {
+        'index.ts': "export default 'hello world';",
+      },
+    },
+  });
+});
+
+afterEach(() => {
+  io?.restore();
+  mockFs.restore();
+});
+
+it('initializes the configuration', async () => {
+  jest.spyOn(process.stdout, 'write').mockImplementation(() => true);
+
+  process.chdir(root);
+
+  const run = async () => {
+    await waitFor(() =>
+      expect(process.stdout.write).toHaveBeenLastCalledWith(
+        expect.stringMatching('The working directory is not clean')
+      )
+    );
+
+    io?.send('y');
+
+    await waitFor(() =>
+      expect(process.stdout.write).toHaveBeenLastCalledWith(
+        expect.stringMatching('Where are your source files?')
+      )
+    );
+
+    io?.send(enter);
+
+    await waitFor(() =>
+      expect(process.stdout.write).toHaveBeenLastCalledWith(
+        expect.stringMatching('Where do you want to generate the output files?')
+      )
+    );
+
+    io?.send(enter);
+
+    await waitFor(() =>
+      expect(process.stdout.write).toHaveBeenLastCalledWith(
+        expect.stringMatching('Which targets do you want to build?')
+      )
+    );
+
+    io?.send(enter);
+
+    await waitFor(() =>
+      expect(process.stdout.write).toHaveBeenLastCalledWith(
+        expect.stringMatching(
+          "You have enabled 'typescript' compilation, but we couldn't find a 'tsconfig.json' in project root"
+        )
+      )
+    );
+
+    io?.send(enter);
+  };
+
+  await Promise.all([run(), init()]);
+
+  expect(process.stdout.write).toHaveBeenLastCalledWith(
+    expect.stringMatching('configured successfully!')
+  );
+
+  expect(await readFile(join(root, 'package.json'), 'utf8')).toMatchSnapshot();
+
+  expect(await readFile(join(root, 'tsconfig.json'), 'utf8')).toMatchSnapshot();
+});