Add first set of docusaurus-build tests using Jest (facebook#259)

* Add Prettier formatting to source files and example files, and check that Prettier formatting is maintained on PRs

* Remove trailing-comma as we are using Node 6 on Circle

* Use latest Node 6 LTS version in Circle

* Initial test suite

* Rename test to match original file

* restore test files

* Remove yarn.lock from pull request. Will run it again in a separate commit

.circleci/config.yml

@@ -31,7 +31,7 @@ defaults: &defaults
 
 version: 2
 jobs:
-  test-website:
+  tests:
     <<: *defaults
     steps:
       - checkout
@@ -42,7 +42,10 @@ jobs:
           name: Check Prettier
           command: yarn ci-check
       - run:
-          name: Test Build Static Website
+          name: Run Test Suites
+          command: yarn test
+      - run:
+          name: Test Static Website Builds
           command: cd website && yarn run build
 
   deploy-website:
@@ -99,11 +102,11 @@ workflows:
 
   website:
     jobs:
-      - test-website:
+      - tests:
           filters: *filter-ignore-gh-pages
       - deploy-website:
           requires:
-            - test-website
+            - tests
           filters: *filter-only-master
 
   deploy:

lib/__tests__/build-files.tests.js

@@ -0,0 +1,107 @@
+const filepath = require('filepath');
+const fm = require('front-matter');
+const fs = require('fs-extra');
+const glob = require('glob-promise');
+const rimraf = require('rimraf');
+const shell = require('shelljs');
+
+const CWD = process.cwd();
+
+const siteConfig = require(CWD + '/website/siteConfig.js');
+const buildDir = CWD + '/website/build';
+const docsDir = CWD + '/docs';
+const staticCSSDir = CWD + '/website/static/css';
+
+let inputMarkdownFiles = [];
+let inputAssetsFiles = [];
+let outputHTMLFiles = [];
+let outputAssetsFiles = [];
+
+function generateSite() {
+  shell.cd('website');
+  shell.exec('yarn build');
+}
+
+function clearBuildFolder() {
+  return rimraf(buildDir);
+}
+
+beforeEach(() => {
+  shell.cd(CWD);
+});
+
+beforeAll(() => {
+  generateSite();
+  return Promise.all([
+    glob(docsDir + '/**/*.md'),
+    glob(buildDir + '/' + siteConfig.projectName + '/docs/*.html'),
+    glob(docsDir + '/assets/*'),
+    glob(buildDir + '/' + siteConfig.projectName + '/img/*'),
+  ]).then(function(results) {
+    inputMarkdownFiles = results[0];
+    outputHTMLFiles = results[1];
+    inputAssetsFiles = results[2];
+    outputAssetsFiles = results[3];
+    return;
+  });
+});
+
+function afterAll() {
+  clearBuildFolder();
+}
+
+test('Build folder exists', function() {
+  return fs.stat(buildDir).then(function(status) {
+    expect(status.isDirectory()).toBeTruthy();
+  });
+});
+
+test('Generated HTML for each Markdown resource', function() {
+  let metadata = [];
+  outputHTMLFiles.forEach(function(file) {
+    const path = filepath.create(file);
+    metadata.push(path.basename());
+  });
+  inputMarkdownFiles.forEach(function(file) {
+    const path = filepath.create(file);
+    const data = fs.readFileSync(file, 'utf8');
+    const frontmatter = fm(data);
+    expect(metadata).toContain(frontmatter.attributes.id + '.html');
+  });
+});
+
+test('Generated table of contents', function() {
+  outputHTMLFiles.forEach(function(file) {
+    const fileContents = fs.readFileSync(file, 'utf8');
+    expect(fileContents).not.toContain('<AUTOGENERATED_TABLE_OF_CONTENTS>');
+  });
+});
+
+test('Concatenated CSS files', function() {
+  return Promise.all([
+    glob(staticCSSDir + '/*.css'),
+    fs.readFile(
+      buildDir + '/' + siteConfig.projectName + '/css/main.css',
+      'utf8'
+    ),
+  ]).then(function(results) {
+    const inputFiles = results[0];
+    const outputFile = results[1];
+    inputFiles.forEach(function(file) {
+      const contents = fs.readFileSync(file, 'utf8');
+      expect(outputFile).toContain(contents);
+    });
+  });
+});
+
+test('Copied assets from /docs/assets', function() {
+  let metadata = [];
+  outputAssetsFiles.forEach(function(file) {
+    const path = filepath.create(file);
+    metadata.push(path.basename());
+  });
+  inputAssetsFiles.forEach(function(file) {
+    const path = filepath.create(file);
+    expect(metadata).toContain(path.basename());
+  });
+});

package.json

@@ -20,7 +20,8 @@
     "nit:source": "prettier --config .prettierrc --list-different \"lib/**/*.js\"",
     "nit:examples": "prettier --config .prettierrc --list-different \"examples/**/*.js\"",
     "prettier": "yarn format:source && yarn format:examples",
-    "prettier:diff": "yarn nit:source && yarn nit:examples"
+    "prettier:diff": "yarn nit:source && yarn nit:examples",
+    "test": "jest"
   },
   "dependencies": {
     "babel-preset-env": "^1.6.0",
@@ -59,6 +60,11 @@
     "docusaurus-feed": "./lib/generate-feed.js"
   },
   "devDependencies": {
-    "prettier": "^1.9.1"
+    "prettier": "^1.9.1",
+    "filepath": "^1.1.0",
+    "front-matter": "^2.3.0",
+    "glob-promise": "^3.3.0",
+    "jest": "^21.2.1",
+    "rimraf": "^2.6.2"
   }
 }