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kotlinlang

I'm trying to understand this piece of code in the samples:
```class TestFakes(
    @get:Provides val episodesDao: EpisodesDao = FakeEpisodesDao(),
    @get:Provides val songsDao: SongsDao = FakeSongsDao(),
)

@Component
@ApplicationScope
abstract class TestApplicationComponent(@Component val fakes: TestFakes = TestFakes())```
Why is `TestFakes` a class and not an interface implementing the "db module" interface? And what's that `@Component` on the `val fakes`? What does it mean?