Add required test suite and websocket fixes

tests/test_api_student.py

@@ -1,2 +1,29 @@
-def test_placeholder_api_student():
-    assert True
+from conftest import create_session, join_student
+
+
+def test_session_metadata_join_me_and_stats(client, sample_pool):
+    sid = create_session(client, sample_pool)
+    metadata = client.get(f"/api/session/{sid}").json()
+    assert metadata["title"] == "Sample Quiz"
+    assert metadata["state"] == "lobby"
+    assert metadata["current_question_idx"] is None
+
+    join = join_student(client, sid, "s1", "First Name")
+    assert join["ok"] is True
+    assert "qz_student" in client.cookies
+
+    join_student(client, sid, "s1", "Updated Name")
+    me = client.get(f"/api/session/{sid}/me")
+    assert me.status_code == 200
+    assert me.json()["name"] == "Updated Name"
+
+    stats = client.get(f"/api/session/{sid}/stats").json()
+    assert stats["question_idx"] is None
+    assert stats["top5"][0]["name"] == "Updated Name"
+
+
+def test_invalid_session_and_missing_cookie_paths(client):
+    assert client.get("/?sid=BAD").status_code == 200
+    assert "Ask your instructor" in client.get("/?sid=BAD").text
+    assert client.get("/api/session/BAD").status_code == 404
+    assert client.get("/api/session/BAD/me").status_code == 401