### Question:
ButtonMerchant { public static ButtonUserActivity activity() { return activity; } private  ButtonMerchant(); static void configure(@NonNull Context context, @NonNull String applicationId); static void trackIncomingIntent(@NonNull Context context, @NonNull Intent intent); @Deprecated static void trackOrder(@NonNull Context context, @NonNull Order order,
            @Nullable UserActivityListener userActivityListener); static void reportOrder(@NonNull Context context, @NonNull Order order,
            @Nullable OrderListener orderListener); @Nullable static String getAttributionToken(@NonNull Context context); static void addAttributionTokenListener(@NonNull Context context,
            @NonNull AttributionTokenListener listener); static void removeAttributionTokenListener(@NonNull Context context,
            @NonNull AttributionTokenListener listener); static void clearAllData(@NonNull Context context); static void handlePostInstallIntent(@NonNull Context context, @NonNull
            PostInstallIntentListener listener); static Features features(); static ButtonUserActivity activity();  }### Answer:
@Test public void activity_verifyInstanceType() { assertTrue(ButtonMerchant.activity() instanceof ButtonUserActivityImpl); }