Effect *mix_effect = tester.get_chain()->add_effect(new MixEffect(), input1, input2);
ASSERT_TRUE(mix_effect->set_float("strength_first", 1.0f));
ASSERT_TRUE(mix_effect->set_float("strength_second", -1.0f));
Effect *mix_effect = tester.get_chain()->add_effect(new MixEffect(), input1, input2);
ASSERT_TRUE(mix_effect->set_float("strength_first", 1.0f));
ASSERT_TRUE(mix_effect->set_float("strength_second", -1.0f));