From 786f3c34204e452c19b462a7db2b4da44b59e077 Mon Sep 17 00:00:00 2001
From: Danijel Martinek <danijel@fraqtal.xyz>
Date: Tue, 5 May 2026 00:39:31 +0200
Subject: [PATCH] feat(auth): add signOutUseCase (test red until DI lands)

---
 .../use-cases/sign-out.use-case.test.ts       | 36 +++++++++++++++++++
 .../use-cases/sign-out.use-case.ts            | 13 +++++++
 2 files changed, 49 insertions(+)
 create mode 100644 packages/auth/src/application/use-cases/sign-out.use-case.test.ts
 create mode 100644 packages/auth/src/application/use-cases/sign-out.use-case.ts

diff --git a/packages/auth/src/application/use-cases/sign-out.use-case.test.ts b/packages/auth/src/application/use-cases/sign-out.use-case.test.ts
new file mode 100644
index 0000000..45e9f1b
--- /dev/null
+++ b/packages/auth/src/application/use-cases/sign-out.use-case.test.ts
@@ -0,0 +1,36 @@
+import { beforeEach, describe, expect, it } from "vitest";
+import { authContainer } from "@/di/container";
+import { AUTH_SYMBOLS } from "@/di/symbols";
+import { MockUsersRepository } from "@/infrastructure/repositories/mock-users.repository";
+import { MockAuthenticationService } from "@/infrastructure/services/mock-authentication.service";
+import type { IUsersRepository } from "@/application/repositories/users-repository.interface";
+import type { IAuthenticationService } from "@/application/services/authentication-service.interface";
+import { signOutUseCase } from "./sign-out.use-case";
+
+describe("signOutUseCase", () => {
+  let usersRepo: MockUsersRepository;
+  let authService: MockAuthenticationService;
+
+  beforeEach(() => {
+    if (authContainer.isBound(AUTH_SYMBOLS.IUsersRepository)) {
+      authContainer.unbind(AUTH_SYMBOLS.IUsersRepository);
+    }
+    if (authContainer.isBound(AUTH_SYMBOLS.IAuthenticationService)) {
+      authContainer.unbind(AUTH_SYMBOLS.IAuthenticationService);
+    }
+    usersRepo = new MockUsersRepository();
+    authService = new MockAuthenticationService(usersRepo);
+    authContainer
+      .bind<IUsersRepository>(AUTH_SYMBOLS.IUsersRepository)
+      .toConstantValue(usersRepo);
+    authContainer
+      .bind<IAuthenticationService>(AUTH_SYMBOLS.IAuthenticationService)
+      .toConstantValue(authService);
+  });
+
+  it("returns a blank cookie", async () => {
+    const result = await signOutUseCase("session_1");
+    expect(result.blankCookie.name).toBe("session");
+    expect(result.blankCookie.value).toBe("");
+  });
+});
diff --git a/packages/auth/src/application/use-cases/sign-out.use-case.ts b/packages/auth/src/application/use-cases/sign-out.use-case.ts
new file mode 100644
index 0000000..9b3ec4c
--- /dev/null
+++ b/packages/auth/src/application/use-cases/sign-out.use-case.ts
@@ -0,0 +1,13 @@
+import type { Cookie } from "../../entities/cookie";
+import { authContainer } from "../../di/container";
+import { AUTH_SYMBOLS } from "../../di/symbols";
+import type { IAuthenticationService } from "../services/authentication-service.interface";
+
+export async function signOutUseCase(
+  sessionId: string,
+): Promise<{ blankCookie: Cookie }> {
+  const authService = authContainer.get<IAuthenticationService>(
+    AUTH_SYMBOLS.IAuthenticationService,
+  );
+  return await authService.invalidateSession(sessionId);
+}