diff --git a/test_numbers.c b/test_numbers.c
index a7e6872..b51492d 100644
--- a/test_numbers.c
+++ b/test_numbers.c
@@ -40,11 +40,21 @@ void test_for_triple(void)
     }
 }
 
+void test_getDuplicate (void)
+{
+    unsigned int numbers[] = {1,18,9,22,7,22,8};
+    unsigned int len = 7;
+
+    TEST_ASSERT_EQUAL_INT (22, getDuplicate(numbers, len)); 
+}
+
 int main(void)
 {
     printf("============================\nNumbers tests\n============================\n");
     UNITY_BEGIN();
     RUN_TEST(test_get_duplicate_error);
     RUN_TEST(test_for_triple);
+    RUN_TEST(test_getDuplicate);
+    
     return UNITY_END();
 }
\ No newline at end of file