Ensure test filtering is case insensitive

Author: bridadan

test/test/mbed_gt_cli.py

@@ -115,5 +115,13 @@ def test_create_filtered_test_list(self):
         expected = set(['mbed-drivers-test-c_strings', 'mbed-drivers-test-generic_tests'])
         self.assertEqual(set(test_list.keys()), expected)
 
+        # Should be case insensitive
+        test_list = mbed_greentea_cli.create_filtered_test_list(test_build.get_tests(),
+                                                                '*-DRIVERS-*',
+                                                                None,
+                                                                test_spec=test_spec)
+        expected = set(['mbed-drivers-test-c_strings', 'mbed-drivers-test-generic_tests'])
+        self.assertEqual(set(test_list.keys()), expected)
+
 if __name__ == '__main__':
     unittest.main()