--- a/src/eric7/Testing/TestingWidget.py	Fri Sep 01 10:26:51 2023 +0200
+++ b/src/eric7/Testing/TestingWidget.py	Thu Oct 05 09:59:53 2023 +0200
@@ -94,6 +94,9 @@
             QComboBox.SizeAdjustPolicy.AdjustToMinimumContentsLengthWithIcon
         )
 
+        self.testComboBox.completer().setCaseSensitivity(
+            Qt.CaseSensitivity.CaseSensitive
+        )
         self.testComboBox.lineEdit().setClearButtonEnabled(True)
 
         # create some more dialog buttons for orchestration