added test for first number 0 and second number positive

test/ggT/test_ggT.c

@@ -16,3 +16,16 @@ void test_ggTOf5And10(){
     //assert
     TEST_ASSERT_EQUAL_INT(expected, result);
 }
+
+void test_ggTOf0AndPositiveNumber(){
+    //arrange
+    int a = 0;
+    int b = 5;
+    int expected = 5;
+
+    //act
+    int result = ggT(a,b);
+
+    //assert
+    TEST_ASSERT_EQUAL_INT(expected, result);
+}