Refactor + add more tests (Part 2) (#854)

* Refactor doc in server.js & generate.js

* Refactor finding metadata with find() & avoid param reassign

* Refactor replacing markdown link to html + add test

* Minify func to getFile & add test

* use ./ for md link as well

* nits & better test

* better mdToHtmlify

* babel-register on versions & write-translations to transpile ES6 in server/env.js

* better docs test & move out metadata to fixtures

* Update .babelrc

lib/server/__tests__/docs.test.js

@@ -0,0 +1,134 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// simulate cwd to website so all require (CWD+'/siteConfig.js') will work
+const originalCwd = process.cwd();
+if (!/website$/.test(originalCwd)) {
+  process.chdir(process.cwd() + '/website');
+}
+const path = require('path');
+const fs = require('fs-extra');
+const docs = require('../docs');
+const metadataUtils = require('../metadataUtils');
+
+jest.mock('../env', () => ({
+  translation: {
+    enabled: true,
+    enabledLanguages: () => [
+      {
+        enabled: true,
+        name: 'English',
+        tag: 'en',
+      },
+      {
+        enabled: true,
+        name: '한국어',
+        tag: 'ko',
+      },
+    ],
+  },
+  versioning: {
+    enabled: true,
+    defaultVersion: '1.0.0',
+  },
+}));
+
+const Metadata = require(path.join(__dirname, '__fixtures__', 'metadata.js'));
+
+const doc1 = fs.readFileSync(
+  path.join(__dirname, '__fixtures__', 'doc1.md'),
+  'utf8'
+);
+
+const doc2 = fs.readFileSync(
+  path.join(__dirname, '__fixtures__', 'doc2.md'),
+  'utf8'
+);
+
+describe('mdToHtmlify', () => {
+  const rawContent1 = metadataUtils.extractMetadata(doc1).rawContent;
+  const rawContent2 = metadataUtils.extractMetadata(doc2).rawContent;
+  const mdToHtml = metadataUtils.mdToHtml(Metadata, '/');
+
+  test('transform nothing', () => {
+    const content1 = docs.mdToHtmlify(
+      rawContent1,
+      mdToHtml,
+      Metadata['en-doc1']
+    );
+    expect(content1).not.toContain('/docs/en/next/');
+    expect(content1).toMatchSnapshot();
+    expect(content1).toEqual(rawContent1);
+  });
+
+  test('transform to correct link', () => {
+    const content2 = docs.mdToHtmlify(
+      rawContent2,
+      mdToHtml,
+      Metadata['en-doc2']
+    );
+    expect(content2).toContain('/docs/en/next/');
+    expect(content2).toMatchSnapshot();
+    expect(content2).not.toEqual(rawContent2);
+  });
+});
+
+describe('getFile', () => {
+  const fakeContent = {
+    'website/translated_docs/ko/doc1.md': '이건 가짜 야',
+    'website/versioned_docs/version-1.0.0/doc2.md': 'Document 2 is not good',
+    'website/translated_docs/ko/version-1.0.0/doc1.md':
+      '이것은 오래된 가짜입니다.',
+    'docs/doc1.md': 'Just another document',
+  };
+  fs.existsSync = jest.fn().mockReturnValue(true);
+  fs.readFileSync = jest.fn().mockImplementation(file => {
+    const fakePath = file.replace(process.cwd().replace(/website$/, ''), '');
+    return fakeContent[fakePath];
+  });
+
+  test('docs does not exist', () => {
+    const metadata = Metadata['en-doc1'];
+    fs.existsSync.mockReturnValueOnce(null);
+    expect(docs.getFile(metadata)).toBeNull();
+  });
+
+  test('null/undefined metadata', () => {
+    expect(docs.getFile(null)).toBeNull();
+    expect(docs.getFile(undefined)).toBeNull();
+  });
+
+  test('translated docs', () => {
+    const metadata = Metadata['ko-doc1'];
+    expect(docs.getFile(metadata)).toEqual(
+      fakeContent['website/translated_docs/ko/doc1.md']
+    );
+  });
+
+  test('versioned docs', () => {
+    const metadata = Metadata['en-version-1.0.0-doc2'];
+    expect(docs.getFile(metadata)).toEqual(
+      fakeContent['website/versioned_docs/version-1.0.0/doc2.md']
+    );
+  });
+
+  test('translated & versioned docs', () => {
+    const metadata = Metadata['ko-version-1.0.0-doc1'];
+    expect(docs.getFile(metadata)).toEqual(
+      fakeContent['website/translated_docs/ko/version-1.0.0/doc1.md']
+    );
+  });
+
+  test('normal docs', () => {
+    const metadata = Metadata['en-doc1'];
+    expect(docs.getFile(metadata)).toEqual(fakeContent['docs/doc1.md']);
+  });
+});
+
+afterAll(() => {
+  process.chdir(originalCwd);
+});