Unit testing with Apache Camel - apache-camel

Question

I want to test below camel route. All the example which i find online has route starting with file, where as in my case i have a spring bean method which is getting called every few minutes and finally message is transformed and moved to jms as well as audit directory.
I am clue less on write test for this route.
All i have currently in my test case is
Mockito.when(tradeService.searchTransaction()).thenReturn(dataWithSingleTransaction);
from("quartz2://tsTimer?cron=0/20+*+8-18+?+*+MON,TUE,WED,THU,FRI+*")
.bean(TradeService.class)
.marshal()
.jacksonxml(true)
.to("jms:queue:out-test")
.to("file:data/test/audit")
.end();

Answer 1

Testing with Apache Camel and Spring-Boot is really easy.
Just do the following (the example below is an abstract example just to give you a hint how you can do it):
Write a Testclass
Use the Spring-Boot Annotations to configure the test class.
#SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.NONE)
#RunWith(SpringRunner.class)
public class MyRouteTest {
#EndpointInject(uri = "{{sourceEndpoint}}")
private ProducerTemplate sourceEndpoint;
....
public void test() {
// send your body to the endpoint. See other provided methods too.
sourceEndpoint.sendBody([your input]);
}
}
In the src/test/application.properties:
Configure your Camel-Endpoints like the source and the target:
sourceEndpoint=direct:myTestSource
Hints:
It's good not to hardwire your start-Endpoint in the route directly when using spring-boot but to use the application.properties. That way it is easier to mock your endpoints for unit tests because you can change to the direct-Component without changing your source code.
This means instead of:
from("quartz2://tsTimer?cron=0/20+*+8-18+?+*+MON,TUE,WED,THU,FRI+*")
you should write:
from("{{sourceEndpoint}}")
and configure the sourceEndpoint in your application.properties:
sourceEndpoint=quartz2://tsTimer?cron=0/20+*+8-18+?+*+MON,TUE,WED,THU,FRI+*
That way you are also able to use your route for different situations.
Documentation
A good documentation about how to test with spring-boot can be found here: https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-testing.html
For Apache Camel: http://camel.apache.org/testing.html

Answer 2

#the hand of NOD Thanks for your hints, i was going into completely wrong direction. After reading your answer i was able to write the basic test and from this i think i can take it forward.
Appreciate your time, however i see that based on my route it should drop an XML file to audit directory which is not happening.
Look like intermediate steps are also getting mocked, without I specifying anything.
InterceptSendToMockEndpointStrategy - Adviced endpoint [xslt://trans.xslt] with mock endpoint [mock:xslt:trans.xslt]
INFO o.a.c.i.InterceptSendToMockEndpointStrategy - Adviced endpoint [file://test/data/audit/?fileName=%24%7Bheader.outFileName%7D] with mock endpoint [mock:file:test/data/audit/]
INFO o.a.camel.spring.SpringCamelContext - StreamCaching is not in use. If using streams then its recommended to enable stream caching. See more details at http://camel.apache.org/stream-caching.html
TradePublisherRoute.java
#Override
public void configure() throws Exception {
logger.info("TradePublisherRoute.configure() : trade-publisher started configuring camel route.");
from("{{trade-publisher.sourceEndpoint}}")
.doTry()
.bean(tradeService)
.process(new Processor() {
#Override
public void process(Exchange exchange) throws Exception {
String dateStr = Constant.dateFormatForFileName.format(new Date());
logger.info("this is getting executed : " + dateStr);
exchange.setProperty(Constant.KEY_INCOMING_XML_FILE_NAME, "REQ-" + dateStr + Constant.AUDIT_FILE_EXTENSION);
exchange.setProperty(Constant.KEY_OUTGOING_XML_FILE_NAME, "RESP-" + dateStr + Constant.AUDIT_FILE_EXTENSION);
}
})
.marshal()
.jacksonxml(true)
.wireTap("{{trade-publisher.requestAuditDir}}" + "${header.inFileName}")
.to("{{trade-publisher.xsltFile}}")
.to("{{trade-publisher.outboundQueue}}")
.to("{{trade-publisher.responseAuditDir}}" + "${header.outFileName}")
.bean(txnService, "markSuccess")
.endDoTry()
.doCatch(Exception.class)
.bean(txnService, "markFailure")
.log(LoggingLevel.ERROR, "EXCEPTION: ${exception.stacktrace}")
.end();
TradePublisherRouteTest.java
#ActiveProfiles("test")
#RunWith(CamelSpringBootRunner.class)
#SpringBootTest(classes = TradePublisherApplication.class)
#MockEndpoints
public class TradePublisherRouteTest {
#EndpointInject(uri = "{{trade-publisher.outboundQueue}}")
private MockEndpoint mockQueue;
#EndpointInject(uri = "{{trade-publisher.sourceEndpoint}}")
private ProducerTemplate producerTemplate;
#MockBean
TradeService tradeService;
private List<Transaction> transactions = new ArrayList<>();
#BeforeClass
public static void beforeClass() {
}
#Before
public void before() throws Exception {
Transaction txn = new Transaction("TEST001", "C001", "100", "JPM", new BigDecimal(100.50), new Date(), new Date(), 1000, "P");
transactions.add(txn);
}
#Test
public void testRouteConfiguration() throws Exception {
Mockito.when(tradeService.searchTransaction()).thenReturn(new Data(transactions));
producerTemplate.sendBody(transactions);
mockQueue.expectedMessageCount(1);
mockQueue.assertIsSatisfied(2000);
}
Please correct me if i am doing something wrong!