Testing for Exceptions
Let’s now look at writing exception tests. We could wrap the method in try-catch. If the method throws the expected exception—that is, if we land in the catch block—all is well.
If the code does not throw any exceptions, we’ll invoke fail to indicate the failure of the test, as shown here:
| UnitTestingWithGroovy/ExpectException.groovy | |
| | try { |
| | divide(2, 0) |
| | fail "Expected ArithmeticException ..." |
| | } catch(ArithmeticException ex) { |
| | assertTrue true // Success |
| | } |
The previous code is Java-style JUnit testing and works with Groovy, as well. However, Groovy makes it easier to write exception tests by providing a method shouldFail that elegantly wraps up the boilerplate code. Let’s use that to write an exception ...
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