ObjectMessageConverterTest.java

/*
 * Copyright 2013-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.cloud.aws.messaging.support.converter;

import org.apache.commons.codec.binary.Base64;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.converter.MessageConversionException;
import org.springframework.messaging.converter.MessageConverter;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.util.MimeType;

import java.io.Serializable;
import java.nio.charset.Charset;
import java.nio.charset.UnsupportedCharsetException;
import java.util.Collections;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

/**
 *
 */
public class ObjectMessageConverterTest {

    @Rule
    public final ExpectedException expectedException = ExpectedException.none();

    @Test
    public void testToMessageAndFromMessage() throws Exception {
        String content = "stringwithspecialcharsöäü€a8";
        MySerializableClass sourceMessage = new MySerializableClass(content);
        MessageConverter messageConverter = new ObjectMessageConverter();
        Message<?> message = messageConverter.toMessage(sourceMessage, getMessageHeaders("UTF-8"));
        assertTrue(Base64.isBase64(message.getPayload().toString().getBytes("UTF-8")));
        MySerializableClass result = (MySerializableClass) messageConverter.fromMessage(message, MySerializableClass.class);
        assertEquals(content, result.getContent());
    }

    @Test
    public void testToMessageAndFromMessageWithCustomEncoding() throws Exception {
        String content = "stringwithspecialcharsöäü€a8";
        MySerializableClass sourceMessage = new MySerializableClass(content);
        MessageConverter messageConverter = new ObjectMessageConverter("ISO-8859-1");
        Message<?> message = messageConverter.toMessage(sourceMessage, getMessageHeaders("ISO-8859-1"));
        assertTrue(Base64.isBase64(message.getPayload().toString().getBytes("ISO-8859-1")));
        MySerializableClass result = (MySerializableClass) messageConverter.fromMessage(message, MySerializableClass.class);
        assertEquals(content, result.getContent());
    }

    @Test(expected = UnsupportedCharsetException.class)
    public void testWithWrongCharset() throws Exception {
        //noinspection ResultOfObjectAllocationIgnored
        new ObjectMessageConverter("someUnsupportedEncoding");
    }

    @Test
    public void testPayloadIsNotAValidBase64Payload() throws Exception {
        this.expectedException.expect(MessageConversionException.class);
        this.expectedException.expectMessage("not a valid base64 encoded stream");

        ObjectMessageConverter messageConverter = new ObjectMessageConverter();
        messageConverter.fromMessage(MessageBuilder.withPayload("test€").build(), null);
    }

    @Test
    public void testPayloadIsNotAValidObjectStream() throws Exception {
        this.expectedException.expect(MessageConversionException.class);
        this.expectedException.expectMessage("Error reading payload");

        ObjectMessageConverter messageConverter = new ObjectMessageConverter();
        messageConverter.fromMessage(MessageBuilder.withPayload("someStream").build(), null);
    }

    private static MessageHeaders getMessageHeaders(String charsetName) {
        return new MessageHeaders(Collections.<String, Object>singletonMap(MessageHeaders.CONTENT_TYPE,
                new MimeType("application", "x-java-serialized-object", Charset.forName(charsetName))));
    }

    private static class MySerializableClass implements Serializable {

        private final String content;

        private MySerializableClass(String content) {
            this.content = content;
        }

        public String getContent() {
            return this.content;
        }
    }
}