Bert Koorengevel created CAMEL-15401:
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Summary: Improve website documentation on testing with SpringBoot
& JUnit5
Key: CAMEL-15401
URL: https://issues.apache.org/jira/browse/CAMEL-15401
Project: Camel
Issue Type: Task
Components: camel-spring-boot, camel-test
Affects Versions: 3.4.2
Environment: Spring Boot 2.3.2, JUnit5 that comes with the former,
Java 11, Maven 3.6
Reporter: Bert Koorengevel
When searching online for strategies to test a fragment of a Camel route with
JUnit5 in the context of a Spring Boot application, the returned documentation
seems somewhat outdated (favouring xml instead of java config for both Spring
and Camel related aspects) and missing a major point.
Some top google hits for "apache camel test spring boot" are:
* [https://camel.apache.org/manual/latest/testing.html]
One (at least me) gets drawn to the "Spring Test With Java Config" example.
When rebuilding from that example in a SpringBoot app, it won't ever work
because the {{ProducerTemplate}} and {{MockEndpoint}} instances remain
{{null}}.
I happened to have an old working example of a project built with Camel v2.20
which had the annotation {{@ContextConfiguration(loader =
CamelSpringDelegatingTestContextLoader.class). }}Adding that (and a dependency
on {{camel-test-spring}} on top of {{camel-test-spring-junit5}}) made the
injections work but caused an NPE at
{{org.apache.camel.test.spring.CamelAnnotationsHandler.handleDisableJmx(CamelAnnotationsHandler.java:90)}}
which gets fixed by adding a static method that sets a dummy test class in
{{CamelSpringTestHelper}}.
After asking for assistance on gitter it was suggested to try to annotate the
test class with {{@CamelSpring*Boot*Test}} instead of {{@CamelSpringTest}} as
the example showed. As always with annotations: that "_magically_" solved all
issues. There was no way I could have known it existed.
* [https://camel.apache.org/manual/latest/spring-testing.html]
Using CamelSpringTestSupport and rolling your own implementation of an
AbstractApplicationContext does not sound very attractive.
The list of examples goes further with "Plain Spring tests" but only supported
by JUnit4. It is uncertain whether this has any chance to work with JUnit5.
* [https://camel.apache.org/components/latest/others/test-spring.html]
As already stated on the page: old and needs updating. Won't comment further.
This looks like the original example I built my Camel v2.20 project with, using
the {{CamelSpringDelegatingTestContextLoader}}
* [https://camel.apache.org/components/latest/others/test-spring-junit5.html]
It first suggests to extend CamelSpringTestSupport, but writing only my test
config in xml does not sound appealing.
Next comes an example again using {{@CamelSpringTest}} which has identical
issues as brought up in my first bullet.
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