diff --git a/test/test_inputHandling.c b/test/test_inputHandling.c
index ac97c3d..3ba48da 100644
--- a/test/test_inputHandling.c
+++ b/test/test_inputHandling.c
@@ -106,4 +106,17 @@ void test_inputHandling_getNumbersAddFormular(void)
     TEST_ASSERT_EQUAL_DOUBLE(5.0, formula.inputNumbers[1]);
     TEST_ASSERT_EQUAL_INT(2, formula.arrayLength);
 }
+
+void test_inputHandling_getNumbersSubFormular(void)
+{
+    char* pnt = NULL;
+    char add[] = "4-5";
+    formula.functionsType = detectFunctionOperator(add,3);
+    pnt = getNumbers(add, 3, &formula);
+    showStruct(&formula);
+    TEST_ASSERT_NULL(pnt);
+    TEST_ASSERT_EQUAL_DOUBLE(4.0, formula.inputNumbers[0]);
+    TEST_ASSERT_EQUAL_DOUBLE(5.0, formula.inputNumbers[1]);
+    TEST_ASSERT_EQUAL_INT(2, formula.arrayLength);
+}
 #endif // TEST