storage/src/test/java/org/apache/james/mime4j/storage/MultiReferenceStorageTest.java

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package org.apache.james.mime4j.storage;

import org.junit.Assert;
import org.junit.Test;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

public class MultiReferenceStorageTest {

    @Test
    public void testForwardsGetInputStream() throws Exception {
        DummyStorage storage = new DummyStorage();
        MultiReferenceStorage multiReferenceStorage = new MultiReferenceStorage(
                storage);

        Assert.assertEquals(ByteArrayInputStream.class, multiReferenceStorage
                .getInputStream().getClass());
    }

    @Test
    public void testSingleReference() throws Exception {
        DummyStorage storage = new DummyStorage();
        MultiReferenceStorage multiReferenceStorage = new MultiReferenceStorage(
                storage);

        Assert.assertFalse(storage.deleted);

        multiReferenceStorage.delete();
        Assert.assertTrue(storage.deleted);
    }

    @Test
    public void testMultiReference() throws Exception {
        DummyStorage storage = new DummyStorage();
        MultiReferenceStorage multiReferenceStorage = new MultiReferenceStorage(
                storage);

        multiReferenceStorage.addReference();

        multiReferenceStorage.delete();
        Assert.assertFalse(storage.deleted);

        multiReferenceStorage.delete();
        Assert.assertTrue(storage.deleted);
    }

    @Test
    public void testGetInputStreamOnDeleted() throws Exception {
        DummyStorage storage = new DummyStorage();
        MultiReferenceStorage multiReferenceStorage = new MultiReferenceStorage(
                storage);

        multiReferenceStorage.delete();

        try {
            multiReferenceStorage.getInputStream();
            Assert.fail();
        } catch (IllegalStateException expected) {
        }
    }

    @Test
    public void testAddReferenceOnDeleted() throws Exception {
        DummyStorage storage = new DummyStorage();
        MultiReferenceStorage multiReferenceStorage = new MultiReferenceStorage(
                storage);

        multiReferenceStorage.delete();

        try {
            multiReferenceStorage.addReference();
            Assert.fail();
        } catch (IllegalStateException expected) {
        }
    }

    private static final class DummyStorage implements Storage {
        public boolean deleted = false;

        public InputStream getInputStream() throws IOException {
            if (deleted)
                throw new IllegalStateException("deleted");

            return new ByteArrayInputStream("dummy".getBytes());
        }

        public void delete() {
            deleted = true;
        }
    }

}