add test for skip api

python_tests/test_api.py

@@ -151,6 +151,30 @@ class APITestCase(TestCase):
         assert better.number == 2
         assert worse.number == 1
 
+    def test_skip_trial(self) -> None:
+        storage = optuna.storages.InMemoryStorage()
+        study = create_study(storage=storage)
+        trials: list[optuna.Trial] = []
+        for _ in range(3):
+            trial = study.ask()
+            study.mark_comparison_ready(trial)
+            trials.append(trial)
+
+        app = create_app(storage)
+        study_id = study._study._study_id
+        status, _, _ = send_request(
+            app,
+            f"/api/studies/{study_id}/{trials[1]._trial_id}/skip",
+            "POST",
+            content_type="application/json",
+        )
+        self.assertEqual(status, 204)
+
+        best_trials = study.best_trials
+        assert len(best_trials) == 2
+        assert best_trials[0].number == 0
+        assert best_trials[1].number == 2
+
     def test_create_study(self) -> None:
         for name, directions, expected_status in [
             ("single-objective success", ["minimize"], 201),