test(api): add test for validation error responses

Author: S1M0N38

tests/test_api_functions.py

@@ -231,6 +231,21 @@ def test_invalid_blind_action(self, udp_client: socket.socket) -> None:
             error_response, "Invalid action arg for skip_or_select_blind", ["action"]
         )
 
+    def test_skip_or_select_blind_invalid_state(self, udp_client: socket.socket) -> None:
+        """Test that skip_or_select_blind returns error when not in blind selection state."""
+        # Go to menu to ensure we're not in blind selection state
+        send_and_receive_api_message(udp_client, "go_to_menu", {})
+
+        # Try to select blind when not in blind selection state
+        error_response = send_and_receive_api_message(
+            udp_client, "skip_or_select_blind", {"action": "select"}
+        )
+
+        # Verify error response
+        assert_error_response(
+            error_response, "Cannot skip or select blind when not in blind selection", ["current_state"]
+        )
+
 
 class TestPlayHandOrDiscard:
     """Tests for the play_hand_or_discard API endpoint."""
@@ -407,6 +422,21 @@ def test_try_to_discard_when_no_discards_left(
             response, "No discards left to perform discard", ["discards_left"]
         )
 
+    def test_play_hand_or_discard_invalid_state(self, udp_client: socket.socket) -> None:
+        """Test that play_hand_or_discard returns error when not in selecting hand state."""
+        # Go to menu to ensure we're not in selecting hand state
+        send_and_receive_api_message(udp_client, "go_to_menu", {})
+
+        # Try to play hand when not in selecting hand state
+        error_response = send_and_receive_api_message(
+            udp_client, "play_hand_or_discard", {"action": "play_hand", "cards": [0, 1, 2, 3, 4]}
+        )
+
+        # Verify error response
+        assert_error_response(
+            error_response, "Cannot play hand or discard when not selecting hand", ["current_state"]
+        )
+
 
 class TestCashOut:
     """Tests for the cash_out API endpoint."""