Test auth flows and switch core tests to session auth

New auth suite covers registration, login (incl. wrong-password), email verification, password reset (old sessions + old password rejected), logout revocation, and no-enumeration on reset. Core tenancy tests now authenticate via real sessions. A capturing mailer makes email flows assertable. 13 tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Justin Paul <justin@jpaul.me>

backend/tests/test_auth.py

@@ -0,0 +1,106 @@
+"""Auth flows: registration, login, email verification, password reset, logout."""
+
+from tests.conftest import auth, register, token_from_link
+
+
+async def test_register_issues_session_and_verification_email(client, mailer):
+    resp = await client.post(
+        "/api/v1/auth/register",
+        json={"email": "new@example.com", "password": "password123", "display_name": "New"},
+    )
+    assert resp.status_code == 201, resp.text
+    body = resp.json()
+    assert body["token"]
+    assert body["user"]["email"] == "new@example.com"
+    assert body["user"]["email_verified_at"] is None
+    # A verification email was "sent".
+    assert len(mailer.verifications) == 1
+    assert mailer.verifications[0][0] == "new@example.com"
+
+
+async def test_duplicate_email_conflicts(client):
+    await register(client, "dupe@example.com")
+    resp = await client.post(
+        "/api/v1/auth/register", json={"email": "dupe@example.com", "password": "password123"}
+    )
+    assert resp.status_code == 409
+
+
+async def test_login_wrong_password_rejected(client):
+    await register(client, "user@example.com", password="password123")
+    resp = await client.post(
+        "/api/v1/auth/login", json={"email": "user@example.com", "password": "wrong-password"}
+    )
+    assert resp.status_code == 401
+
+
+async def test_login_succeeds_and_me_returns_user(client):
+    await register(client, "user2@example.com", password="password123")
+    resp = await client.post(
+        "/api/v1/auth/login", json={"email": "user2@example.com", "password": "password123"}
+    )
+    assert resp.status_code == 200
+    token = resp.json()["token"]
+    resp = await client.get("/api/v1/users/me", headers=auth(token))
+    assert resp.status_code == 200
+    assert resp.json()["email"] == "user2@example.com"
+
+
+async def test_email_verification(client, mailer):
+    await register(client, "verify@example.com")
+    token = token_from_link(mailer.verifications[0][1])
+    resp = await client.post("/api/v1/auth/verify-email", json={"token": token})
+    assert resp.status_code == 204
+
+    # Logging in and checking /me shows the address is now verified.
+    login = await client.post(
+        "/api/v1/auth/login", json={"email": "verify@example.com", "password": "password123"}
+    )
+    me = await client.get("/api/v1/users/me", headers=auth(login.json()["token"]))
+    assert me.json()["email_verified_at"] is not None
+
+
+async def test_password_reset_flow_revokes_old_sessions(client, mailer):
+    old_token = await register(client, "reset@example.com", password="password123")
+
+    resp = await client.post(
+        "/api/v1/auth/request-password-reset", json={"email": "reset@example.com"}
+    )
+    assert resp.status_code == 202
+    reset_token = token_from_link(mailer.resets[0][1])
+
+    resp = await client.post(
+        "/api/v1/auth/reset-password",
+        json={"token": reset_token, "new_password": "new-password456"},
+    )
+    assert resp.status_code == 204
+
+    # Old session is revoked.
+    assert (await client.get("/api/v1/users/me", headers=auth(old_token))).status_code == 401
+    # Old password no longer works; new one does.
+    assert (
+        await client.post(
+            "/api/v1/auth/login", json={"email": "reset@example.com", "password": "password123"}
+        )
+    ).status_code == 401
+    assert (
+        await client.post(
+            "/api/v1/auth/login",
+            json={"email": "reset@example.com", "password": "new-password456"},
+        )
+    ).status_code == 200
+
+
+async def test_request_password_reset_unknown_email_still_accepted(client, mailer):
+    resp = await client.post(
+        "/api/v1/auth/request-password-reset", json={"email": "nobody@example.com"}
+    )
+    assert resp.status_code == 202
+    assert len(mailer.resets) == 0  # no email sent, but no enumeration either
+
+
+async def test_logout_revokes_session(client):
+    token = await register(client, "logout@example.com")
+    assert (await client.get("/api/v1/users/me", headers=auth(token))).status_code == 200
+    assert (await client.post("/api/v1/auth/logout", headers=auth(token))).status_code == 204
+    assert (await client.get("/api/v1/users/me", headers=auth(token))).status_code == 401