Delete unused helper method

Author: ardila

tests/helpers.py

@@ -184,8 +184,4 @@ def assert_polygon_prediction_matches_dict(
     assert_polygon_annotation_matches_dict(
         prediction_instance, prediction_dict
     )
-    assert prediction_instance.confidence == prediction_dict["confidence"]
-
-
-def test_repr(test_object: any):
-    assert eval(str(test_object)) == test_object
+    assert prediction_instance.confidence == prediction_dict["confidence"]