The utility class name 'Tools' doesn't match '[A-Z][a-zA-Z0-9]+(Utils?|Helper)' Use equals() to compare strings instead of '==' or '!=' The JUnit 4 test method name 'addition_isCorrect' doesn't match '[a-z][a-zA-Z0-9]*' The JUnit 4 test method name 'getLabel_1' doesn't match '[a-z][a-zA-Z0-9]*' The JUnit 4 test method name 'getLabel_2' doesn't match '[a-z][a-zA-Z0-9]*'