Create Fake Agent Skill

internal class FakeCustomerRepository(
    private val paymentMethods: List<PaymentMethod> = emptyList(),
    private val customer: Customer? = null
) : CustomerRepository {
    // Implementation
}

internal class FakePaymentMethodVerticalLayoutInteractor(
    initialState: PaymentMethodVerticalLayoutInteractor.State,
    initialShowsWalletsHeader: Boolean = false,
    private val viewActionRecorder: ViewActionRecorder<PaymentMethodVerticalLayoutInteractor.ViewAction>
) : PaymentMethodVerticalLayoutInteractor {

    companion object {
        fun create(
            paymentMethodMetadata: PaymentMethodMetadata = PaymentMethodMetadataFactory.create(),
            initialShowsWalletsHeader: Boolean = true,
            viewActionRecorder: ViewActionRecorder<PaymentMethodVerticalLayoutInteractor.ViewAction> = ViewActionRecorder()
        ): FakePaymentMethodVerticalLayoutInteractor {
            // Complex initialization logic
            val initialState = /* construct complex state */
            return FakePaymentMethodVerticalLayoutInteractor(
                initialState = initialState,
                initialShowsWalletsHeader = initialShowsWalletsHeader,
                viewActionRecorder = viewActionRecorder
            )
        }
    }
}

internal class FakeEventReporter : EventReporter {
    val paymentFailureCalls = Turbine<PaymentFailureCall>()
    val paymentSuccessCalls = Turbine<PaymentSuccessCall>()

    override fun onPaymentFailure(error: Throwable, source: PaymentEventSource) {
        paymentFailureCalls.add(PaymentFailureCall(error, source))
    }

    override fun onPaymentSuccess(paymentMethod: PaymentMethod) {
        paymentSuccessCalls.add(PaymentSuccessCall(paymentMethod))
    }
}

data class PaymentFailureCall(val error: Throwable, val source: PaymentEventSource)
data class PaymentSuccessCall(val paymentMethod: PaymentMethod)
data class DetachRequest(val paymentMethodId: String, val customerId: String)

fun ensureAllEventsConsumed() {
    paymentFailureCalls.ensureAllEventsConsumed()
    paymentSuccessCalls.ensureAllEventsConsumed()
    detachRequests.ensureAllEventsConsumed()
    updateRequests.ensureAllEventsConsumed()
    // ... validate all turbines
}

@Test
fun `test payment flow`() = runTest {
    val fake = FakeEventReporter()

    // Perform operations
    fake.onPaymentSuccess(paymentMethod)

    // Verify calls
    assertThat(fake.paymentSuccessCalls.awaitItem()).isEqualTo(
        PaymentSuccessCall(paymentMethod)
    )

    // Validate all events consumed
    fake.ensureAllEventsConsumed()
}

internal class FakePaymentMethodVerticalLayoutInteractor(
    initialState: PaymentMethodVerticalLayoutInteractor.State,
    private val viewActionRecorder: ViewActionRecorder<PaymentMethodVerticalLayoutInteractor.ViewAction>
) : PaymentMethodVerticalLayoutInteractor {

    override fun handleViewAction(viewAction: PaymentMethodVerticalLayoutInteractor.ViewAction) {
        viewActionRecorder.record(viewAction)
        // Optional: implement state changes based on action
    }
}

companion object {
    fun create(
        paymentMethodMetadata: PaymentMethodMetadata = PaymentMethodMetadataFactory.create(),
        viewActionRecorder: ViewActionRecorder<PaymentMethodVerticalLayoutInteractor.ViewAction> = ViewActionRecorder()
    ): FakePaymentMethodVerticalLayoutInteractor {
        return FakePaymentMethodVerticalLayoutInteractor(
            initialState = /* ... */,
            viewActionRecorder = viewActionRecorder
        )
    }
}