Add tests for activity signup and management, including duplicate prevention and participant unregistration

Author: Woman4Coding

requirements.txt

@@ -1,4 +1,5 @@
 fastapi
 uvicorn
 httpx
-watchfiles
+watchfiles
+pytest

tests/__init__.py

@@ -0,0 +1,67 @@
+import pytest
+from fastapi.testclient import TestClient
+from src.app import app, activities
+
+client = TestClient(app)
+
+# Helper to reset activities for test isolation
+def reset_participants():
+    for activity in activities.values():
+        if isinstance(activity.get("participants"), list):
+            activity["participants"] = []
+
+def test_get_activities():
+    # Arrange
+    reset_participants()
+    # Act
+    response = client.get("/activities")
+    # Assert
+    assert response.status_code == 200
+    data = response.json()
+    assert isinstance(data, dict)
+    assert "Chess Club" in data
+
+def test_signup_for_activity():
+    # Arrange
+    reset_participants()
+    email = "testuser@mergington.edu"
+    # Act
+    response = client.post(f"/activities/Chess Club/signup?email={email}")
+    # Assert
+    assert response.status_code == 200
+    assert email in activities["Chess Club"]["participants"]
+
+
+def test_signup_duplicate():
+    # Arrange
+    reset_participants()
+    email = "testuser@mergington.edu"
+    client.post(f"/activities/Chess Club/signup?email={email}")
+    # Act
+    response = client.post(f"/activities/Chess Club/signup?email={email}")
+    # Assert
+    assert response.status_code == 400
+    assert response.json()["detail"] == "Student is already signed up for this activity"
+
+
+def test_unregister_participant():
+    # Arrange
+    reset_participants()
+    email = "testuser@mergington.edu"
+    client.post(f"/activities/Chess Club/signup?email={email}")
+    # Act
+    response = client.delete(f"/activities/Chess Club/unregister?email={email}")
+    # Assert
+    assert response.status_code == 200
+    assert email not in activities["Chess Club"]["participants"]
+
+
+def test_unregister_nonexistent():
+    # Arrange
+    reset_participants()
+    email = "notfound@mergington.edu"
+    # Act
+    response = client.delete(f"/activities/Chess Club/unregister?email={email}")
+    # Assert
+    assert response.status_code == 404
+    assert response.json()["detail"] == "Participant not found in this activity"