Add missing newline at end of test file

Author: pja-ant

tests/issues/test_1338_icons_and_metadata.py

@@ -127,4 +127,4 @@ def basic_tool() -> str:
     assert len(tools) == 1
     tool = tools[0]
     assert tool.name == "basic_tool"
-    assert tool.icons is None
+    assert tool.icons is None