Gradle test case

I created a test unit that will simply print a String, that String value is "/UFFFD/UFFD0"(some non ascii characters). when I execute my test case using IntelliJ the result is the unicode characters but when I do it via gradle I got "??", investigating deeper it's not just a display issue in fact the byte code of the two character changed to be the ? ascii character. Any thoughts ? PS: adding

    compileJava {options.encoding = "UTF-8"}
compileTestJava {options.encoding = "UTF-8"}