BlockJUnit4ClassRunnerTest.java

package org.junit.tests.running.classes;

import static org.junit.Assert.assertEquals;

import java.util.List;

import org.junit.Test;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.InitializationError;

public class BlockJUnit4ClassRunnerTest {
    public static class OuterClass {
        public class Enclosed {
            @Test
            public void test() {
            }
        }
    }

    @Test
    public void detectNonStaticEnclosedClass() throws Exception {
        try {
            new BlockJUnit4ClassRunner(OuterClass.Enclosed.class);
        } catch (InitializationError e) {
            List<Throwable> causes = e.getCauses();
            assertEquals("Wrong number of causes.", 1, causes.size());
            assertEquals(
                    "Wrong exception.",
                    "The inner class org.junit.tests.running.classes.BlockJUnit4ClassRunnerTest$OuterClass$Enclosed is not static.",
                    causes.get(0).getMessage());
        }
    }
}