Add test for StreamableHTTPReconnectionOptions validation

Author: felixweinberger

tests/shared/test_streamable_http.py

@@ -1897,6 +1897,25 @@ async def test_streamablehttp_client_with_reconnection_options(basic_server: Non
             assert isinstance(result, InitializeResult)
 
 
+def test_reconnection_options_validation():
+    """Test StreamableHTTPReconnectionOptions validates delay settings."""
+    from mcp.client.streamable_http import StreamableHTTPReconnectionOptions
+
+    # Valid options should work
+    valid = StreamableHTTPReconnectionOptions(
+        initial_reconnection_delay=1.0,
+        max_reconnection_delay=30.0,
+    )
+    assert valid.initial_reconnection_delay == 1.0
+
+    # Invalid options should raise
+    with pytest.raises(ValueError, match="initial_reconnection_delay cannot exceed"):
+        StreamableHTTPReconnectionOptions(
+            initial_reconnection_delay=60.0,
+            max_reconnection_delay=30.0,
+        )
+
+
 @pytest.mark.anyio
 async def test_streamablehttp_client_auto_reconnection(event_server: tuple[SimpleEventStore, str]):
     """Test automatic client reconnection when server closes SSE stream mid-operation."""