How to inject a mocked dependency into the tested instance?

Question

Hey
my StringGenerator class accesses the workspace being able to look up certain information from different files in the workspace. Now I'm writing an isolated unit test that should work without the eclipse workspace. Unfortunately I'm not able to inject the mocked dependency.
How do I inject the mocked instance of ResourceLookUp into the StringGenerator instance?
The class to be tested:
class StringGenerator {
@Inject extension ResourceLookUp resourceLookUp
def dispatch initStep(TestRequired o) '''
Test Case «o.name.testNameLookUp» (Test Case ID: «o.name») has been successfully performed.'''
The Test:
import static org.mockito.Mockito.*
@RunWith(JUnitParamsRunner)
class StringGeneratorInitialisationTest {
@Inject extension ValidationTestHelper validationTestHelper = new ValidationTestHelper
@Inject extension StringGenerator stringGenerator = new StringGenerator
@Inject extension ParseHelper<Model> parseHelper = new ParseHelper
@Before
def void before() {
var i = new TestStandaloneSetup().createInjectorAndDoEMFRegistration
i.injectMembers(parseHelper)
val resourceLookUp = mock(ResourceLookUp)
when(resourceLookUp.testNameLookUp("TEST XYZ")).thenReturn("TEST NAME AS STRING")
// how do I get this mocked ResourceLookUp instances injected into StringGenerator instance?
i.injectMembers(stringGenerator)
i.injectMembers(validationTestHelper)
// here comes my test ....
I was playing around with the debugger but could not find any solution
Thank you!
Kon

Answer 1

Hey,
noticed that the injection does not work completely as expected. The StringGenerator class gets the mocked ResourceLookUp instance.
class StringGenerator {
@Inject extension ResourceLookUp resourceLookUp
def dispatch initStep(TestRequired o) '''
Test Case «o.name.testNameLookUp» (Test Case ID: «o.name») has been successfully performed.'''
but if the test-case contains an error assertion like model.assertNoErrors my TestValidator gets called. Unfortunately the ResourceLookUp instance there is not the mocked one
class TestValidator extends AbstractTestValidator {
@Inject extension ResourceLookUp resourceLookUp
It somehow ignores my guice setup:
val mockedResourceLookUp = mock(ResourceLookUp)
when(mockedResourceLookUp.testNameLookUp("TEST XYZ")).thenReturn("TEST NAME AS STRING")
bind(ResourceLookUp).toInstance(mockedResourceLookUp)
and uses the "real" class for injection. Is there anything spezial about the dependency injection for the validator class?
Thank you.
Kon