added test for converting hex input to decimal

test/conversionOfNumbers/test_conversionOfNumbers.c

@@ -202,3 +202,15 @@ void test_convertBinaryStr10110ToInt22(){
     //assert
     TEST_ASSERT_EQUAL_UINT(expected, result);
 }
+
+void test_convertHexStr2A3ToInt675(){
+    //arrange
+    unsigned int result;
+    unsigned int expected = 675;
+
+    //act
+    result = convertHexStrToInt("2A3");
+
+    //assert
+    TEST_ASSERT_EQUAL_UINT(expected, result);
+}