added test for implementation of hexStrLen function into convertIntToHex function

test/conversionOfNumbers/test_conversionOfNumbers.c

@@ -177,3 +177,16 @@ void test_hexStringLengthOfInput0is1(){
     //assert
     TEST_ASSERT_EQUAL_INT(expected, result);
 }
+
+void test_convert234ToHexStrEA(){
+    //arrange
+    char* result;
+    char expected[] = "EA";
+
+    //act
+    result = convertIntToHex(234);
+
+    //assert
+    TEST_ASSERT_EQUAL_STRING(expected, result);
+    free(result);
+}