Examples of org.junit.runner.manipulation.Filter

org.junit.runner.manipulation.Filter
The canonical case of filtering is when you want to run a single test method in a class. Rather than introduce runner API just for that one case, JUnit provides a general filtering mechanism. If you want to filter the tests to be run, extend Filter and apply an instance of your filter to the {@link org.junit.runner.Request} before running it (see{@link org.junit.runner.JUnitCore#run(Request)}. Alternatively, apply a Filter to a {@link org.junit.runner.Runner} before running tests (for example, in conjunction with{@link org.junit.runner.RunWith}. @since 4.0


    @Test
    public void filterSingleMethodFromOldTestClass() throws Exception {
        final Description method = Description.createTestDescription(
                TwoOldTests.class, "testOne");
        Filter filter = Filter.matchMethodDescription(method);
        JUnit38ClassRunner child = new JUnit38ClassRunner(TwoOldTests.class);
        child.filter(filter);
        assertEquals(1, child.testCount());
    }

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        assertFilterLeavesTestUnscathed(AllTests.class);
    }


    private void assertFilterLeavesTestUnscathed(Class<?> testClass) {
        Request oneClass = Request.aClass(testClass);
        Request filtered = oneClass.filterWith(new Filter() {
            @Override
            public boolean shouldRun(Description description) {
                return true;
            }

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import org.junit.runners.model.InitializationError;
import org.junit.runners.model.RunnerBuilder;


public class ParentRunnerFilteringTest {
    private static Filter notThisMethodName(final String methodName) {
        return new Filter() {
            @Override
            public boolean shouldRun(Description description) {
                return description.getMethodName() == null
                        || !description.getMethodName().equals(methodName);
            }

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    }


    @Test
    public void testSuiteFiltering() throws Exception {
        Runner runner = Request.aClass(ExampleSuite.class).getRunner();
        Filter filter = notThisMethodName("test1");
        try {
            filter.apply(runner);
        } catch (NoTestsRemainException e) {
            return;
        }
        fail("Expected 'NoTestsRemainException' due to complete filtering");
    }

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    @Test
    public void testSuiteFilteringWithUnmodifyableChildList() throws Exception {
        Runner runner = Request.aClass(ExampleSuiteWithUnmodifyableChildList.class)
                .getRunner();
        Filter filter = notThisMethodName("test1");
        try {
            filter.apply(runner);
        } catch (NoTestsRemainException e) {
            return;
        }
        fail("Expected 'NoTestsRemainException' due to complete filtering");
    }

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        return Request.aClass(DummySuite.class);
    }


    @Test
    public void shouldCreateFilterWithArguments() throws Exception {
        Filter filter = FilterFactories.createFilterFromFilterSpec(
                createSuiteRequest(),
                ExcludeCategories.class.getName() + "=" + DummyCategory.class.getName());


        assertThat(filter.describe(), startsWith("excludes "));
    }

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        assertThat(filter.describe(), startsWith("excludes "));
    }


    @Test
    public void shouldCreateFilterWithNoArguments() throws Exception {
        Filter filter = FilterFactories.createFilterFromFilterSpec(
                createSuiteRequest(), FilterFactoryStub.class.getName());


        assertThat(filter, instanceOf(DummyFilter.class));
    }

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    @Test
    public void shouldPassOnDescriptionToFilterFactory() throws Exception {
        Request request = createSuiteRequest();
        Description description = request.getRunner().getDescription();
        Filter filter = FilterFactories.createFilterFromFilterSpec(
                request, FilterFactoryStub.class.getName());


        // This assumption tested in shouldCreateFilterWithNoArguments()
        assumeThat(filter, instanceOf(DummyFilter.class));

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        assertThat(dummyFilter.getTopLevelDescription(), is(description));
    }


    @Test
    public void shouldCreateFilter() throws Exception {
        Filter filter = FilterFactories.createFilter(
                FilterFactoryStub.class,
                new FilterFactoryParams(
                        Description.createSuiteDescription(testName.getMethodName()),
                        ""));

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    @Test
    public void shouldCreateFilter() throws Exception {
        FilterFactoryParams params = new FilterFactoryParams(
                createSuiteDescription(testName.getMethodName()),
                CategoryFilterFactoryStub.class.getName());
        Filter filter = categoryFilterFactory.createFilter(params);


        assertThat(filter, instanceOf(DummyFilter.class));
    }

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