What is the correct way to mock a declarative REST client when unit testing a Grails service?
Details
I am using Micronaut's declarative HTTP client in my Grails 4 app.
I tried to unit test the client using Ersatz, but I couldn't get it working after several days: How do I configure Micronaut @Client in a grails test environment?
Now, I'm trying to unit test a service that uses it, using the standard approach for mocking dependencies:
class MyServiceSpec extends Specification implements
ServiceUnitTest<MyService> {
MyRestClient myRestClient = Mock()
def setup() {
service.myRestClient = myRestClient
}
...
}
This gives me a NoSuchBeanDefinitionException.
I have found through trial and error that declarative client does not work with def myRestClient, like other Grails beans. It must be @Autowired.
at org.grails.testing.GrailsUnitTest$Trait$Helper.defineBeans(GrailsUnitTest.groovy:99)
at grails.testing.services.ServiceUnitTest$Trait$Helper.mockArtefact(ServiceUnitTest.groovy:58)
at org.grails.testing.ParameterizedGrailsUnitTest$Trait$Helper.getArtefactInstance(ParameterizedGrailsUnitTest.groovy:48)
at grails.testing.services.ServiceUnitTest$Trait$Helper.getService(ServiceUnitTest.groovy:85)
at com.mycompany.MyServiceSpec.setup(MyServiceSpec.groovy:##)
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mycompany.MyRestClient' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1662)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1221)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1175)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:595)
... 15 more
