Upgrade database_service unittests

These test cases use MagicMock for convenience, rather than using a mocked AnalysisResult. However, now added result entry is internally converted into dataframe format and the input object is discarded after add_analysis_results call. So it's no longer possible to track method call or evaluate identity of input object. Since user will never store MagicMock to experiment data, this change to unittest should not introduce any edge case and should not decrease the practical test coverage.

Author: nkanazawa1989

test/database_service/test_db_experiment_data.py

@@ -436,28 +436,43 @@ def test_add_get_analysis_result(self):
         """Test adding and getting analysis results."""
         exp_data = ExperimentData(experiment_type="qiskit_test")
         results = []
-        for idx in range(5):
+        result_ids = list(map(str, range(5)))
+        for idx in result_ids:
             res = mock.MagicMock()
             res.result_id = idx
             results.append(res)
             exp_data.add_analysis_results(res)
 
-        self.assertEqual(results, exp_data.analysis_results())
-        self.assertEqual(results[1], exp_data.analysis_results(1))
-        self.assertEqual(results[2:4], exp_data.analysis_results(slice(2, 4)))
-        self.assertEqual(results[4], exp_data.analysis_results(results[4].result_id))
+        # We cannot compare results with exp_data.analysis_results()
+        # This test is too hacky since it tris to compare MagicMock with AnalysisResult.
+        self.assertEqual(
+            [res.result_id for res in exp_data.analysis_results()],
+            result_ids,
+        )
+        self.assertEqual(
+            exp_data.analysis_results(1).result_id,
+            result_ids[1],
+        )
+        self.assertEqual(
+            [res.result_id for res in exp_data.analysis_results(slice(2, 4))],
+            result_ids[2:4],
+        )
 
     def test_add_get_analysis_results(self):
         """Test adding and getting a list of analysis results."""
         exp_data = ExperimentData(experiment_type="qiskit_test")
         results = []
-        for idx in range(5):
+        result_ids = list(map(str, range(5)))
+        for idx in result_ids:
             res = mock.MagicMock()
             res.result_id = idx
             results.append(res)
         exp_data.add_analysis_results(results)
+        get_result_ids = [res.result_id for res in exp_data.analysis_results()]
 
-        self.assertEqual(results, exp_data.analysis_results())
+        # We cannot compare results with exp_data.analysis_results()
+        # This test is too hacky since it tris to compare MagicMock with AnalysisResult.
+        self.assertEqual(get_result_ids, result_ids)
 
     def test_delete_analysis_result(self):
         """Test deleting analysis result."""