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Seems likes it might be useful to have the assert display a message when an assertion fails.
Currently an AssertionError gets thrown, can you specify a custom message for it?
Can you show an example mechanism for doing this (other than creating your own exception type and throwing it)?
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assert statement takes an expression and optional message. assert statement is used to check types, values of argument and the output of the function. assert statement is used as debugging tool as it halts the program at the point where an error occurs.
An assertion is a statement in Java which ensures the correctness of any assumptions which have been done in the program. When an assertion is executed, it is assumed to be true. If the assertion is false, the JVM will throw an Assertion error. It finds it application primarily in the testing purposes.
According to Sun Specification, assertion should not be used to check arguments in the public methods because it should result in appropriate runtime exception e.g. IllegalArgumentException, NullPointerException etc. Do not use assertion, if you don't want any error in any situation.
That an “Assert” is used only for validations, where an “If” clause is used for the logic within our code. We can use an “If” clause to determine whether our automation should follow one path or another, but an “Assert” statement to validate the elements within those paths.
You certainly can:
assert x > 0 : "x must be greater than zero, but x = " + x; See Programming with Assertions for more information.
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assert (condition) : "some message"; I'd recommend putting the conditional in brackets
assert (y > x): "y is too small. y = " + y; Imagine if you came across code like this...
assert isTrue() ? true : false : "some message"; Don't forget this has nothing to do with asserts you'd write in JUnit.
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