ExternalResourceRuleTest.java

package org.junit.tests.experimental.rules;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.junit.experimental.results.PrintableResult.testResult;
import static org.junit.experimental.results.ResultMatchers.isSuccessful;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExternalResource;

public class ExternalResourceRuleTest {
    private static String callSequence;

    public static class UsesExternalResource {
        @Rule
        public ExternalResource resource = new ExternalResource() {
            @Override
            protected void before() throws Throwable {
                callSequence += "before ";
            }

            ;

            @Override
            protected void after() {
                callSequence += "after ";
            }

            ;
        };

        @Test
        public void testFoo() {
            callSequence += "test ";
        }
    }

    @Test
    public void externalResourceGeneratesCorrectSequence() {
        callSequence = "";
        assertThat(testResult(UsesExternalResource.class), isSuccessful());
        assertEquals("before test after ", callSequence);
    }
}