feat(redirects): Generate _redirects on build

tools/scripts/createRedirects.test.js

@@ -0,0 +1,72 @@
+/* global describe expect */
+
+const { createRedirects } = require('./createRedirects');
+
+const testLocations = {
+  api: 'https://api.example.com',
+  home: 'https://home.example.com',
+  forum: 'https://forum.example.com',
+  forumProxy: 'https://proxy.example.com'
+};
+
+describe('createRedirects', () => {
+  it('is a function', () => {
+    expect(typeof createRedirects).toEqual('function');
+  });
+
+  it('returns a string', () => {
+    expect(typeof createRedirects(testLocations)).toEqual('string');
+  });
+
+  it('replaces instances of `#{{...}}` with the locations provided', () => {
+    expect.assertions(8);
+
+    const apiPlaceholderRE = /#\{\{API\}\}/;
+    const homePlaceholderRE = /#\{\{HOME\}\}/;
+    const forumPlacehilderRE = /#\{\{FORUM\}\}/;
+    const forumProxyPlaceholderRE = /#\{\{FORUM_PROXY\}\}/;
+    const redirects = createRedirects(testLocations);
+
+    const hasApiPlaceholder = apiPlaceholderRE.test(redirects);
+    const hasHomePlaceholder = homePlaceholderRE.test(redirects);
+    const hasForumPlaceholder = forumPlacehilderRE.test(redirects);
+    const hasForumProxyPlaceholder = forumProxyPlaceholderRE.test(redirects);
+
+    expect(hasApiPlaceholder).toBe(false);
+    expect(hasHomePlaceholder).toBe(false);
+    expect(hasForumPlaceholder).toBe(false);
+    expect(hasForumProxyPlaceholder).toBe(false);
+
+    const { api, home, forum, forumProxy } = testLocations;
+    expect(redirects.includes(`${api}/internal/:splat`)).toBe(true);
+    expect(
+      redirects.includes(
+        `${home}/forum/t/free-code-camp-privacy-policy/19545 301`
+      )
+    ).toBe(true);
+    expect(redirects.includes(`${forum} 301`)).toBe(true);
+    expect(redirects.includes(`${forumProxy} 200`)).toBe(true);
+  });
+
+  it('throws when any location is missing', () => {
+    expect.assertions(4);
+
+    const api = 'api';
+    const home = 'home';
+    const forum = 'forum';
+    const forumProxy = 'forumProxy';
+
+    const noApi = { forum, home, forumProxy };
+    const noHome = { api, forum, forumProxy };
+    const noForum = { api, home, forumProxy };
+    const noProxy = { api, home, forum };
+
+    expect(() => createRedirects(noApi)).toThrow();
+    expect(() => createRedirects(noHome)).toThrow();
+    expect(() => createRedirects(noForum)).toThrow();
+    expect(() => createRedirects(noProxy)).toThrow();
+  });
+
+  it('matches the snapshot', () =>
+    expect(createRedirects(testLocations)).toMatchSnapshot());
+});