b test

fix test fail because separate threads

tests/UI_slider.cpp

@@ -23,6 +23,7 @@ TEST(UI_slider, set_value)
 {
     UI_slider slider("slider_id", "slider_text", Color(255, 255, 255), Color(0, 0, 0), 0, 100, 50, on_change);
     slider.set_value(75);
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
     EXPECT_EQ(val, 75);
 }