[JAVA] I want to use PowerMock in a class that combines parameterized tests and ordinary tests

TL;DR

--Only @Runwith (Enclosed.class) for external classes --I will add the following to the inner class - @RunWith(PowerMockRunner.class) --@PrepareForTest ({tested class}) - @PowerMockRunnerDelegate(Parameterized.class) --@PowerMockRunnerDelegate (JUnit4.class) is not required

What I wanted to do

--static initializer I wanted to write a test of the processing to be executed --There was a mixture of parameterized tests and tests that you wanted to run only once. ――However, it is unpleasant to distribute the test code for one class in multiple places.

I looked it up

--Tests that interrupt static can be done with Mockito + PowerMock --Parameterized tests can be done using @RunWith (Theories.class) or @RunWith (Parameterized.class) --If it is Parameterized, it asserts for each parameter, so I adopted this one. --You can use @ RunWith (Enclosed.class) to combine multiple test classes into one class.

Library configuration

• junit: 4.12
• mockito-core: 1.10.19
• powermock-core: 1.7.3
• powermock-module-junit4: 1.7.3
• powermock-api-mockito: 1.7.3

verification code

Test target

public class StaticClass {
    public static String MESSAGE;

    static {
        int i = new Random().nextInt();
        if (0 <= i && i <= 10) {
            MESSAGE = "Parameter is inside of range, 0 to 10.";
        } else {
            MESSAGE = "Nmm...?";
            method();
        }
    }

    private static void method() {
        // to do any action
    }
}

test

@RunWith(Enclosed.class)
public class StaticClassTest {

    @RunWith(PowerMockRunner.class)
    @PrepareForTest({StaticClass.class})
    @PowerMockRunnerDelegate(Parameterized.class)
    public static class ParameterizeTest {
        @Parameterized.Parameter
        public Integer parameter;

        @Parameterized.Parameters(name = "parameter is {0}")
        public static Object[][] parameterSupplier() {
            return new Object[][]{
                    {0},
                    {1},
                    {2},
                    {3},
                    {4},
                    {5},
                    {6},
                    {7},
                    {8},
                    {9},
                    {10}
            };
        }


        @Test
        public void test() throws Exception {
            // given
            Random random = PowerMockito.mock(Random.class);
            PowerMockito.whenNew(Random.class).withNoArguments().thenReturn(random);
            PowerMockito.when(random.nextInt()).thenReturn(parameter);

            // expect
            assertEquals("Parameter is inside of range, 0 to 10.",
                    Whitebox.getInternalState(StaticClass.class, "MESSAGE"));
        }
    }

    @RunWith(PowerMockRunner.class)
    @PrepareForTest({StaticClass.class})
    public static class NormalTest {
        @Test
        public void test() throws Exception {
            // given
            Random random = PowerMockito.mock(Random.class);
            PowerMockito.whenNew(Random.class).withNoArguments().thenReturn(random);
            PowerMockito.when(random.nextInt()).thenReturn(99);

            // expect
            assertEquals("Nmm...?",
                    Whitebox.getInternalState(StaticClass.class, "MESSAGE"));
        }
    }
}

reference

http://tomoyamkung.net/2013/08/28/java-junit4-enclosed/ https://stackoverflow.com/questions/28027445/powermock-access-private-members