added test to reproduce palette display bug

tests/test_show_palette.py

@@ -0,0 +1,32 @@
+import pytest
+
+from hydra import initialize, compose
+from loguru import logger
+from pytti.workhorse import _main as render_frames
+from omegaconf import OmegaConf, open_dict
+
+
+CONFIG_BASE_PATH = "config"
+CONFIG_DEFAULTS = "default.yaml"
+
+
+def run_cfg(cfg_str):
+    with initialize(config_path=CONFIG_BASE_PATH):
+        cfg_base = compose(
+            config_name=CONFIG_DEFAULTS,
+            overrides=[f"conf=_empty"],
+        )
+        cfg_this = OmegaConf.create(cfg_str)
+
+        with open_dict(cfg_base) as cfg:
+            cfg = OmegaConf.merge(cfg_base, cfg_this)
+        render_frames(cfg)
+
+
+def test_show_palette():
+    cfg_str = f"""# @package _global_
+scenes: a photograph of an apple
+image_model: Limited Palette
+show_palette: true
+"""
+    run_cfg(cfg_str)