camel-core/src/test/java/org/apache/camel/processor/EvaluateExpressionProcessorTest.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.processor;

import org.apache.camel.CamelExecutionException;
import org.apache.camel.ContextTestSupport;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;

/**
 *
 */
public class EvaluateExpressionProcessorTest extends ContextTestSupport {

    public void testOk() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:result");
        mock.expectedBodiesReceived("World");
        mock.expectedPropertyReceived(Exchange.EVALUATE_EXPRESSION_RESULT, "Hello World");

        template.sendBody("direct:start", "World");

        assertMockEndpointsSatisfied();
    }

    public void testFail() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:result");
        mock.expectedMessageCount(0);

        try {
            template.sendBody("direct:fail", "World");
            fail("Should have thrown exception");
        } catch (CamelExecutionException e) {
            assertIsInstanceOf(IllegalArgumentException.class, e.getCause());
            assertEquals("Forced", e.getCause().getMessage());
        }

        assertMockEndpointsSatisfied();
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                from("direct:start")
                    .process(new EvaluateExpressionProcessor(body().prepend("Hello ")))
                    .to("mock:result");

                from("direct:fail")
                    .process(new EvaluateExpressionProcessor(new Expression() {
                        @Override
                        public <T> T evaluate(Exchange exchange, Class<T> type) {
                            throw new IllegalArgumentException("Forced");
                        }
                    }))
                    .to("mock:result");
            }
        };
    }
}