* Return {@link TestGroup}'s system property assigned to a given annotation.
*/
public static String getGroupSysProperty(Class<? extends Annotation> annotationClass) {
TestGroup testGroup = annotationClass.getAnnotation(TestGroup.class);
String tmp = RandomizedRunner.emptyToNull(testGroup.sysProperty());
return (tmp != null ? tmp : SysGlobals.prefixProperty(getGroupName(annotationClass)));
}
}