??? ASSERT: Judging whether a condition is true
??? asserttrue: an alternative method of Assert, to determine if a condition is true
??? assertequals: It is used to determine whether the actual value and the expectation value are the same (Equals), which can be a variety of Java
Object.
??? assertnotnull: Decades whether an object is not empty
??? assertnull: Determine if an object is empty
??? assertsame: Determine if the actual value and the expected value are the same object (==), pay attention to Assertequals
distinguish
??? fail: Direct return failed, throw AssertionFaileDerror
