question: public void verifyEqualsContractPositive ( Object x , Object y , Object z ) { Assert . assertTrue ( x . equals ( x ) ) ; Assert . assertTrue ( x . equals ( y ) && y . equals ( x ) ) ; Assert . assertTrue ( x . equals ( y ) && y . equals ( z ) && x . equals ( z ) ) ; Assert . assertTrue ( x . equals ( y ) ) ; Assert . assertTrue ( x . equals ( y ) ) ; Assert . assertTrue ( x . equals ( y ) ) ; Assert . assertTrue ( y . equals ( z ) ) ; Assert . assertTrue ( y . equals ( z ) ) ; Assert . assertTrue ( y . equals ( z ) ) ; Assert . assertFalse ( x . equals ( null ) ) ; Assert . assertFalse ( y . equals ( null ) ) ; Assert . assertFalse ( z . equals ( null ) ) ; }
target:  <p>verify that the objects passed as paremeters obey the general contract of equals(), as listed in Item 7 of Bloch's Effective Java.