chore: init from code-review-graph-main snapshot (v2.3.7)

tests/fixtures/sample_mocha.test.ts

@@ -0,0 +1,16 @@
+// Mocha TDD interface: enabled via `mocha --ui tdd`.
+// `suite` is the describe-equivalent and `test` is the it-equivalent.
+import { UserRepository, UserService } from './sample_typescript';
+
+suite('UserService (mocha TDD)', () => {
+  test('constructs a service', () => {
+    const service = new UserService();
+    if (!service) throw new Error('expected service');
+  });
+
+  test('returns undefined for unknown id', () => {
+    const service = new UserService();
+    const user = service.getUser(404);
+    if (user !== undefined) throw new Error('expected undefined');
+  });
+});