Junit Test exception

There are two ways of doing this:

First, the use of expectedexception

Supported only on junit4.7. You can test not only the catch to an exception, but also the exception message.

Examples of use are as follows:

@Rule PublicExpectedException exception =Expectedexception.none (); @Test Public voidShouldthrowexceptionwhensumgivenonenegativenumber ()throwsException {exception.expect (Exception.class); Exception.expectmessage (Containsstring ("Negatives not allowed")); Exception.expectmessage (Containsstring ("-1")); Stringcalculator.calculate (" -1,1"); } Public Static intCalculate (String numbers)throwsException {Throw NewException ("Negatives not allowed:-1"); }

Precautions:

1. ExpectedException must be public

Second, the use of annotation

This can only be measured in the presence of anomalies, not the exception message

How to use:

@Test (expected = Exception.  Class)    publicvoidthrows  Exception {        Stringcalculator.calculate (" -1,-1");    }

Junit Test exception