Test error

Author: peterbrittain

.github/workflows/test.yml

@@ -26,6 +26,7 @@ jobs:
           setup_method: install
           reporter: github-check
           level: warning
+          fail_level: error
           install_types: false
           target: asciimatics
           workdir: .

asciimatics/event.py

@@ -57,7 +57,7 @@ def __init__(self, x: int, y: int, buttons: int):
         self.y = y
         self.buttons = buttons
 
-    def __repr__(self) -> str:
+    def __repr__(self) -> None:
         """
         :returns: a string representation of the mouse event.
         """