Add test for withdrawSpecificAmount for failure

tests/test_withdrawMoney.c

@@ -63,6 +63,28 @@ void test_withdrawSpecificAmountSuccess(void) {
    
 }
 
+void test_withdrawSpecificAmountFailure(void) {
+
+   /* Arrange */
+
+   int user_id[3]   = {12034, 13027, 16606}; // Random wrong user_ids
+
+   bool result[3];
+
+   /* Act */
+   
+   for (int i = 0; i < 3; i++) {
+        result[i] = withdrawSpecificAmount(user_id[i], 50);
+    }   
+
+    /* Assert */
+    
+    for (int i = 0; i < 3; i++) {
+        TEST_ASSERT_FALSE(result[i]);     // Pass if withdrawal fails and function returns false
+    }
+   
+}
+