In Groovy, the find method exists on Object. The find method is also an instance method on EntityManager which is commonly used in JPA to get an instance based on a database id. I was trying to create a Mock of EntityManager like:
def emMock = new MockFor(EntityManager)
emMock.demand.find { Class clazz, Object rquid -> return new Request(rqUID: rquid) }
def em = emMock.proxyDelegateInstance()
This gave me an error though:
groovy.lang.MissingMethodException: No signature of method: com.onelinefix.services.RequestRepositoryImplTest$_2_get_closure1.doCall() is applicable for argument types: (groovy.mock.interceptor.Demand) values: [groovy.mock.interceptor.Demand@a27ebd9]
Possible solutions: doCall(java.lang.Class, java.lang.Object), findAll(), findAll(), isCase(java.lang.Object), isCase(java.lang.Object)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:264) ~[groovy-all-1.8.6.jar:1.8.6]
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:877) ~[groovy-all-1.8.6.jar:1.8.6]
at groovy.lang.Closure.call(Closure.java:412) ~[groovy-all-1.8.6.jar:1.8.6]
at groovy.lang.Closure.call(Closure.java:425) ~[groovy-all-1.8.6.jar:1.8.6]
It ends up that find is a DefaultGroovyMethod that's added to all Objects and this was causing the mock.demand to get confused because it thought I was trying to call the Object.find.
Luckily there is a workaround and that's to use the ordinal argument for find.
emMock.demand.find(1) { Class clazz, Object rquid -> return new Request(rqUID: rquid) }That's enough of a change to invoke mock version instead of the DefaultGroovyMethod version. Now if I only knew why....