JUnit4 – Ryan Chapin's Website

How To Spy and Verify a Static Void Method in Java

Posted on February 24, 2021 by rchapin

The Mockito and PowerMockito libraries for JUnit4 are not always the most intuitive.

Following is an example of how to spy and verify a static void method.

    @Test
    public void testAdd() {

        // Prepare the Utils class to be spied.
        PowerMockito.spy(Utils.class);

        // Run the test and get the actual value from the OUT
        int actualValue = App.add("Test1", 1, 1);

        /*
         * To verify the number of times that we called Utils.doSomething we
         * first need to tell the PowerMockito library

→ Continue reading

Unit Testing Private Static Methods With Primitive Array Arguments

Posted on March 19, 2015March 27, 2021 by rchapin

When writing unit tests to cover your entire program you will undoubtedly come across the need to test private methods. There are arguments that these methods should be tested via integration tests, but there are sometimes when it makes more sense to test all of the permutations in a unit test. This can be achieved using reflection in Java JUnit tests.

What is a little tricky, and was not completely obvious, was how to use reflection to test a private → Continue reading “Unit Testing Private Static Methods With Primitive Array Arguments”