class UncaughtExceptionHandlerIntegrationTest {
    // ...
    val scopes2 = mock<IScopes>()

    // test analogous to existing one (`multiple registrations do not cause the build-up of a tree of UncaughtExceptionHandlerIntegrations`):
    @Test
    fun `multiple registrations`() {
        val initialUncaughtExceptionHandler = Thread.UncaughtExceptionHandler { _, _ -> }

        var currentDefaultHandler: Thread.UncaughtExceptionHandler? = initialUncaughtExceptionHandler

        val handler = mock<UncaughtExceptionHandler>()
        whenever(handler.defaultUncaughtExceptionHandler).thenAnswer { currentDefaultHandler }

        whenever(handler.setDefaultUncaughtExceptionHandler(anyOrNull<Thread.UncaughtExceptionHandler>())).then {
            currentDefaultHandler = it.getArgument(0)
            null
        }

        val integration1 = UncaughtExceptionHandlerIntegration(handler)
        integration1.register(fixture.scopes, fixture.options)

        val integration2 = UncaughtExceptionHandlerIntegration(handler)
        integration2.register(fixture.scopes2, fixture.options)

        assertEquals(currentDefaultHandler, integration2)
        integration2.close()

        assertEquals(integration1, currentDefaultHandler)
    }
}