Check if strings are rotations of each other or not - Java

public class RotatedOrNot {
    public boolean isRotated(String realString, String stringToTest){
        String helpingString = realString+realString;
        if(helpingString.contains(stringToTest))
            return true;        else return false;    }
}

public class RotatedOrNotTest {
    @Test    public void testNormalCase() {
        RotatedOrNot rotatedOrNot = new RotatedOrNot();        assertEquals(true,rotatedOrNot.isRotated("abcde","cdeab"));    }
}