Add tests for activity management: implement signup and unregister functionality

Author: HarshitMCT

requirements.txt

@@ -1,3 +1,5 @@
+# For testing
+pytest
 fastapi
 uvicorn
 httpx

tests/test_app.py

@@ -0,0 +1,91 @@
+import pytest
+from fastapi.testclient import TestClient
+from src.app import app, activities
+
+client = TestClient(app)
+
+@pytest.fixture(autouse=True)
+def reset_activities():
+    # Arrange: Reset the in-memory activities before each test
+    for activity in activities.values():
+        activity['participants'].clear()
+        # Optionally, repopulate with initial data if needed
+
+# --- Root endpoint ---
+def test_root_redirect():
+    # Act
+    response = client.get("/")
+    # Assert
+    assert response.status_code in (200, 307, 308)
+
+# --- List activities ---
+def test_get_activities():
+    # Act
+    response = client.get("/activities")
+    # Assert
+    assert response.status_code == 200
+    data = response.json()
+    assert isinstance(data, dict)
+    assert "Chess Club" in data
+
+# --- Signup for activity ---
+def test_signup_success():
+    # Arrange
+    email = "test1@mergington.edu"
+    activity = "Chess Club"
+    # Act
+    response = client.post(f"/activities/{activity}/signup?email={email}")
+    # Assert
+    assert response.status_code == 200
+    assert email in activities[activity]["participants"]
+
+# --- Signup duplicate ---
+def test_signup_duplicate():
+    # Arrange
+    email = "test2@mergington.edu"
+    activity = "Chess Club"
+    client.post(f"/activities/{activity}/signup?email={email}")
+    # Act
+    response = client.post(f"/activities/{activity}/signup?email={email}")
+    # Assert
+    assert response.status_code == 400
+    assert "already signed up" in response.json()["detail"]
+
+# --- Signup for non-existent activity ---
+def test_signup_activity_not_found():
+    # Act
+    response = client.post("/activities/Nonexistent/signup?email=foo@bar.com")
+    # Assert
+    assert response.status_code == 404
+    assert "Activity not found" in response.json()["detail"]
+
+# --- Unregister participant ---
+def test_unregister_success():
+    # Arrange
+    email = "test3@mergington.edu"
+    activity = "Chess Club"
+    client.post(f"/activities/{activity}/signup?email={email}")
+    # Act
+    response = client.delete(f"/activities/{activity}/signup?email={email}")
+    # Assert
+    assert response.status_code == 200
+    assert email not in activities[activity]["participants"]
+
+# --- Unregister not registered ---
+def test_unregister_not_registered():
+    # Arrange
+    email = "notregistered@mergington.edu"
+    activity = "Chess Club"
+    # Act
+    response = client.delete(f"/activities/{activity}/signup?email={email}")
+    # Assert
+    assert response.status_code == 404
+    assert "not registered" in response.json()["detail"]
+
+# --- Unregister from non-existent activity ---
+def test_unregister_activity_not_found():
+    # Act
+    response = client.delete("/activities/Nonexistent/signup?email=foo@bar.com")
+    # Assert
+    assert response.status_code == 404
+    assert "Activity not found" in response.json()["detail"]