diff --git a/test/test_input.c b/test/test_input.c
index 76cb1cf..c086d80 100644
--- a/test/test_input.c
+++ b/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);
+}