testing with invalid input

test/test_input.c

@@ -66,3 +66,9 @@ void test_testg(void){
   char result = getTInput('g');
   TEST_ASSERT_EQUAL_CHAR('n', result);
 }
+
+//test input invalid
+void test_testg(void){
+  char result = getTInput('b');
+  TEST_ASSERT_EQUAL_CHAR('n', result);
+}