diff --git a/test/test_input.c b/test/test_input.c
index 3e1c960..e3511e9 100644
--- a/test/test_input.c
+++ b/test/test_input.c
@@ -73,6 +73,12 @@ void test_testb(void){
   TEST_ASSERT_EQUAL_CHAR('n', result);
 }
 
+//test input invalid
+void test_testc(void){
+  char result = getTInput('c');
+  TEST_ASSERT_EQUAL_CHAR('n', result);
+}
+
 void test_testkbhit(void){
   int result = kbhit();
   TEST_ASSERT_EQUAL_INT(0, result);