Asserting log entries in JUnit Jupiter is not as straight forward as one might want, but after some digging I found a way that worked for me. It should also me said that doing this i Jupiter is far easier than in previous versions of JUnit
The trick here is to use the SpringBoot OutputCaptureExtension on you test class. This can be accomplished with the @ExtendWith annotation in SpringBoot. This will inject a CapturedOutput object with output from our application
Example test class:
...
import org.springframework.boot.test.system.CapturedOutput;
import org.springframework.boot.test.system.OutputCaptureExtension;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.CoreMatchers.containsString;
@Test
@ExtendWith(OutputCaptureExtension.class)
public void testHappyCaseSendDataToSystem(CapturedOutput output) throws Exception {
MockEndpoint mock = camelContext.getEndpoint("mock:senddataToSystem", MockEndpoint.class);
// Setting expectations
mock.expectedMessageCount(1);
// Invoking consumer
producerTemplate.sendBody("direct:start", null);
// Asserting mock is satisfied
mock.assertIsSatisfied();
// Assert log message
assertThat(output.getOut(), containsString("LogMessage=Completed"));
}
Tested on SpringBoot v3.2.0 and JUnit 5.10.1
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