Initial commit

packages/auth/tests/sign-in-flow.feature.test.ts

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+// Feature-level test: sign-up, then sign-in with the new credentials, then sign-out.
+// Constructs the full chain via direct injection (no container rebinding).
+
+import { describe, it, expect } from "vitest";
+import { RecordingEventBus } from "@repo/core-testing/instrumentation";
+import { NoopRateLimit } from "@repo/core-shared/rate-limit";
+import { MockUsersRepository } from "../src/infrastructure/repositories/users.repository.mock";
+import { MockAuthenticationService } from "../src/infrastructure/services/authentication.service.mock";
+import { signInUseCase } from "../src/application/use-cases/sign-in.use-case";
+import { signUpUseCase } from "../src/application/use-cases/sign-up.use-case";
+import { signOutUseCase } from "../src/application/use-cases/sign-out.use-case";
+import { signInController } from "../src/interface-adapters/controllers/sign-in.controller";
+import { signUpController } from "../src/interface-adapters/controllers/sign-up.controller";
+import { signOutController } from "../src/interface-adapters/controllers/sign-out.controller";
+
+describe("auth feature: sign-up → sign-in → sign-out", () => {
+  it("a new user can sign up, then sign in, then sign out", async () => {
+    // Construct the full chain via direct injection
+    const users = new MockUsersRepository([]);
+    const auth = new MockAuthenticationService(users);
+
+    const signIn = signInController(
+      signInUseCase(users, auth, new NoopRateLimit()),
+    );
+    const signUp = signUpController(
+      signUpUseCase(users, auth, new RecordingEventBus(), undefined),
+    );
+    const signOut = signOutController(signOutUseCase(auth));
+
+    // signUp returns a cookie (presenter shape)
+    const signUpCookie = await signUp({
+      username: "newperson",
+      password: "verysecret",
+      confirmPassword: "verysecret",
+    });
+    expect(signUpCookie.name).toBe("session");
+    expect(signUpCookie.value).toBeTruthy();
+
+    const signInCookie = await signIn({
+      username: "newperson",
+      password: "verysecret",
+    });
+    expect(signInCookie.name).toBe("session");
+    expect(signInCookie.value).toBeTruthy();
+
+    // signOut takes { sessionId } and returns void
+    const signOutResult = await signOut({ sessionId: signInCookie.value });
+    expect(signOutResult).toBeUndefined();
+  });
+});