diff --git a/tests/test_helperFunctions.c b/tests/test_helperFunctions.c
index 0b42d1a..aea1cf5 100644
--- a/tests/test_helperFunctions.c
+++ b/tests/test_helperFunctions.c
@@ -211,3 +211,18 @@ void test_generateCheckString()
 		TEST_ASSERT_EQUAL_STRING(result_3[i],generateCheckString(random_numbers[i],strings_3[i]));
 	}
 }
+
+void test_characterIsUpperCase()
+{
+	/*test values*/
+	char c1 = 'x', c2 = 'y', c3 = 'z';
+	char c4 = 'A',  c5 = 'B', c6 = 'C';
+	/*assertions*/
+	TEST_ASSERT_FALSE(characterIsUpperCase(c1));
+	TEST_ASSERT_FALSE(characterIsUpperCase(c2));
+	TEST_ASSERT_FALSE(characterIsUpperCase(c3));
+	TEST_ASSERT_TRUE(characterIsUpperCase(c4));
+	TEST_ASSERT_TRUE(characterIsUpperCase(c5));
+	TEST_ASSERT_TRUE(characterIsUpperCase(c6));
+
+}