Modular Programming in Java 9

Testing a Java 9 module

Let's examine how this works by testing the packt.sortutil from the sample address book viewer application. The code is available at the 12-build-tools-and-testing/02-testing location. The src folder contains the packt.sortutil module--the module under test.

To test this, we can create a new test module: packt.sortutil.test. A good convention to follow is to name the test modules with the name of the module being tested followed by .test. Here's the module definition for packt.sortutil.test:

    module packt.sortutil.test { 
      requires packt.sortutil; 
    } 

By declaring the dependency on the module, you can access its exported types and test them through code. Here's a sample class in the test module that verifies that the ...