package org.junit.tests.assertion;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.lang.annotation.AnnotationFormatError;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.junit.Test;
import org.junit.runners.model.MultipleFailureException;

/**
 * Tests for {@link org.junit.runners.model.MultipleFailureException}
 *
 * @author kcooney@google.com (Kevin Cooney)
 */
public class MultipleFailureExceptionTest {

    @Test
    public void assertEmptyDoesNotThrowForEmptyList() throws Exception {
        MultipleFailureException.assertEmpty(Collections.<Throwable>emptyList());
    }

    @Test
    public void assertEmptyRethrowsSingleRuntimeException() throws Exception {
        Throwable exception= new ExpectedException("pesto");
        List<Throwable> errors= Collections.singletonList(exception);
        try {
            MultipleFailureException.assertEmpty(errors);
            fail();
        } catch (ExpectedException e) {
            assertSame(e, exception);
        }
    }
    
    @Test
    public void assertEmptyRethrowsSingleError() throws Exception {
        Throwable exception= new AnnotationFormatError("changeo");
        List<Throwable> errors= Collections.singletonList(exception);
        try {
            MultipleFailureException.assertEmpty(errors);
            fail();
        } catch (AnnotationFormatError e) {
            assertSame(e, exception);
        }
    }

    @Test
    public void assertEmptyThrowsMutipleFailureExceptionForManyThrowables() throws Exception {
        List<Throwable> errors = new ArrayList<Throwable>();
        errors.add(new ExpectedException("basil"));
        errors.add(new RuntimeException("garlic"));

        try {
            MultipleFailureException.assertEmpty(errors);
            fail();
        } catch (MultipleFailureException expected) {
            assertThat(expected.getFailures(), equalTo(errors));
            assertTrue(expected.getMessage().startsWith("There were 2 errors:\n"));
            assertTrue(expected.getMessage().contains("ExpectedException(basil)\n"));
            assertTrue(expected.getMessage().contains("RuntimeException(garlic)"));
        }
    }


    private static class ExpectedException extends RuntimeException {
        private static final long serialVersionUID = 1L;

        public ExpectedException(String message) {
            super(message);
        }
    }
}