Finish happy path test for creating a study

tests/routers/openml/study_test.py

@@ -1,3 +1,5 @@
+from datetime import datetime
+
 from starlette.testclient import TestClient
 
 
@@ -450,7 +452,7 @@ def test_get_task_study_by_alias(py_api: TestClient) -> None:
 
 
 def test_create_task_study(py_api: TestClient) -> None:
-    py_api.post(
+    response = py_api.post(
         "/studies?api_key=00000000000000000000000000000000",
         json={
             "name": "Test Study",
@@ -461,3 +463,34 @@ def test_create_task_study(py_api: TestClient) -> None:
             "runs": [],
         },
     )
+    assert response.status_code == 200
+    new = response.json()
+    assert "study_id" in new
+    study_id = new["study_id"]
+    assert isinstance(study_id, int)
+
+    study = py_api.get(f"/studies/{study_id}")
+    assert study.status_code == 200
+    expected = {
+        "id": study_id,
+        "alias": "test-study",
+        "main_entity_type": "task",
+        "name": "Test Study",
+        "description": "A test study",
+        "visibility": "public",
+        "status": "in_preparation",
+        "creator": 2,
+        "data_ids": [1, 1, 1],
+        "task_ids": [1, 2, 3],
+        "run_ids": [],
+        "flow_ids": [],
+        "setup_ids": [],
+    }
+    new_study = study.json()
+
+    creation_date = datetime.strptime(
+        new_study.pop("creation_date"),
+        "%Y-%m-%dT%H:%M:%S",
+    )
+    assert creation_date.date() == datetime.now().date()
+    assert new_study == expected