Angular2 "Final" Unit Test Override Directive - unit-testing

Question

I am using Angular 2 Final, and using the TestBed for Unit tests
I have an issue when when using "overrideDirective" it seems that the actual directive is being called, as I am getting an error "No provider for Config!" which MyDirective that was replaced is dependent on.
Component View
<div>
<input myDirective>
// some more logic etc...
</div>
Directive to Replace
#Directive({
selector: "myDirective"
})
class MyDirective{
constructor(
private config: Config
) {
}
}
Spec File
#Component({
template: "<my-component></my-component>"
})
class TestComponent{
}
#Directive({
selector: "fake"
})
class FakeDirective {
}
beforeEach(() => {
TestBed.configureTestingModule({
declarations: [
MyComponent,
MyDirective,
TestComponent,
FakeDirective
]
});
});
beforeEach(async(() => {
TestBed
.overrideDirective(MyDirective, FakeDirective)
.compileComponents();
fixture = TestBed.createComponent(TestComponent);
}));
Any one encountered the issue and managed to fix it please?
Thanks