core/camel-core/src/test/java/org/apache/camel/component/file/FileProducerAllowNullBodyTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.camel.component.file;

import java.io.File;

import org.apache.camel.CamelExecutionException;
import org.apache.camel.ContextTestSupport;
import org.junit.Before;
import org.junit.Test;

/**
 * Unit tests to ensure that When the allowNullBody option is set to true it
 * will create an empty file and not throw an exception When the allowNullBody
 * option is set to false it will throw an exception of "Cannot write null body
 * to file."
 */
public class FileProducerAllowNullBodyTest extends ContextTestSupport {

    @Override
    @Before
    public void setUp() throws Exception {
        deleteDirectory("target/data/allow");
        super.setUp();
    }

    @Test
    public void testAllowNullBodyTrue() throws Exception {
        template.sendBody("file://target/data/allow?allowNullBody=true&fileName=allowNullBody.txt", null);
        assertFileExists("target/data/allow/allowNullBody.txt");
    }

    @Test
    public void testAllowNullBodyFalse() throws Exception {
        try {
            template.sendBody("file://target/data/allow?fileName=allowNullBody.txt", null);
            fail("Should have thrown a GenericFileOperationFailedException");
        } catch (CamelExecutionException e) {
            GenericFileOperationFailedException cause = assertIsInstanceOf(GenericFileOperationFailedException.class, e.getCause());
            assertTrue(cause.getMessage().endsWith("allowNullBody.txt"));
        }

        assertFalse("allowNullBody set to false with null body should not create a new file", new File("target/data/allow/allowNullBody.txt").exists());
    }
}