handle different GitHub URL input formats (codesandbox#56)

Author: bengummer

src/app/utils/url-generator.js

@@ -89,4 +89,4 @@ export const optionsToParameterizedUrl = (options: Object) => {
 };
 
 export const gitHubToSandboxUrl = (githubUrl: string) =>
-  githubUrl.replace('https://github.com', '/s/github');
+  githubUrl.replace(/https?:\/\/(www.)?github.com/, '/s/github');

src/app/utils/url-generator.test.js

@@ -0,0 +1,16 @@
+import { gitHubToSandboxUrl } from './url-generator';
+
+describe('url-generator', () => {
+  describe('gitHubToSandboxUrl', () => {
+    [
+      'http://github.com/user/repo',
+      'http://www.github.com/user/repo',
+      'https://github.com/user/repo',
+      'https://www.github.com/user/repo'
+    ].forEach(inputUrl => {
+      test(`handles ${inputUrl} urls`, () => {
+        expect(gitHubToSandboxUrl(inputUrl)).toBe('/s/github/user/repo');
+      });
+    })
+  });
+});