VerifierRuleTest.java

package org.junit.tests.experimental.rules;

import static org.hamcrest.CoreMatchers.is;
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.hasFailureContaining;
import static org.junit.experimental.results.ResultMatchers.isSuccessful;

import java.util.concurrent.Callable;

import org.junit.Rule;
import org.junit.Test;
import org.junit.experimental.results.PrintableResult;
import org.junit.rules.ErrorCollector;
import org.junit.rules.Verifier;

public class VerifierRuleTest {
    public static class UsesErrorCollector {
        @Rule
        public ErrorCollector collector = new ErrorCollector();

        @Test
        public void example() {
            collector.addError(new Throwable("message"));
        }
    }

    @Test
    public void usedErrorCollectorShouldFail() {
        assertThat(testResult(UsesErrorCollector.class), hasFailureContaining("message"));
    }

    public static class UsesErrorCollectorTwice {
        @Rule
        public ErrorCollector collector = new ErrorCollector();

        @Test
        public void example() {
            collector.addError(new Throwable("first thing went wrong"));
            collector.addError(new Throwable("second thing went wrong"));
        }
    }

    @Test
    public void usedErrorCollectorTwiceShouldFail() {
        PrintableResult testResult = testResult(UsesErrorCollectorTwice.class);
        assertThat(testResult, hasFailureContaining("first thing went wrong"));
        assertThat(testResult, hasFailureContaining("second thing went wrong"));
    }

    public static class UsesErrorCollectorCheckThat {
        @Rule
        public ErrorCollector collector = new ErrorCollector();

        @Test
        public void example() {
            collector.checkThat(3, is(4));
            collector.checkThat(5, is(6));
            collector.checkThat("reason 1", 7, is(8));
            collector.checkThat("reason 2", 9, is(16));
        }
    }

    @Test
    public void usedErrorCollectorCheckThatShouldFail() {
        PrintableResult testResult = testResult(UsesErrorCollectorCheckThat.class);
        assertThat(testResult, hasFailureContaining("was <3>"));
        assertThat(testResult, hasFailureContaining("was <5>"));
        assertThat(testResult, hasFailureContaining("reason 1"));
        assertThat(testResult, hasFailureContaining("was <7>"));
        assertThat(testResult, hasFailureContaining("reason 2"));
        assertThat(testResult, hasFailureContaining("was <9>"));
    }

    public static class UsesErrorCollectorCheckSucceeds {
        @Rule
        public ErrorCollector collector = new ErrorCollector();

        @Test
        public void example() {
            collector.checkSucceeds(new Callable<Object>() {
                public Object call() throws Exception {
                    throw new RuntimeException("first!");
                }
            });
            collector.checkSucceeds(new Callable<Object>() {
                public Object call() throws Exception {
                    throw new RuntimeException("second!");
                }
            });
        }
    }

    @Test
    public void usedErrorCollectorCheckSucceedsShouldFail() {
        PrintableResult testResult = testResult(UsesErrorCollectorCheckSucceeds.class);
        assertThat(testResult, hasFailureContaining("first!"));
        assertThat(testResult, hasFailureContaining("second!"));
    }

    public static class UsesErrorCollectorCheckSucceedsPasses {
        @Rule
        public ErrorCollector collector = new ErrorCollector();

        @Test
        public void example() {
            assertEquals(3, collector.checkSucceeds(new Callable<Object>() {
                public Object call() throws Exception {
                    return 3;
                }
            }));
        }
    }

    @Test
    public void usedErrorCollectorCheckSucceedsShouldPass() {
        PrintableResult testResult = testResult(UsesErrorCollectorCheckSucceedsPasses.class);
        assertThat(testResult, isSuccessful());
    }

    private static String sequence;

    public static class UsesVerifier {
        @Rule
        public Verifier collector = new Verifier() {
            @Override
            protected void verify() {
                sequence += "verify ";
            }
        };

        @Test
        public void example() {
            sequence += "test ";
        }
    }

    @Test
    public void verifierRunsAfterTest() {
        sequence = "";
        assertThat(testResult(UsesVerifier.class), isSuccessful());
        assertEquals("test verify ", sequence);
    }
}