feat(palette_viewer): added widget to display the current palette and accent colors

tests/unit_tests/test_palette_viewer.py

@@ -0,0 +1,37 @@
+import pytest
+from qtpy.QtCore import Qt
+
+from bec_widgets.qt_utils.palette_viewer import PaletteViewer
+from bec_widgets.widgets.dark_mode_button.dark_mode_button import DarkModeButton
+
+
+@pytest.fixture
+def palette_viewer(qtbot):
+    widget = PaletteViewer()
+    qtbot.addWidget(widget)
+    qtbot.waitExposed(widget)
+    yield widget
+
+
+def test_palette_viewer_renders_palette_and_accents(qtbot, palette_viewer):
+    assert palette_viewer.frame_layout.count() == 28
+    palette_viewer.clear_palette()
+    assert palette_viewer.frame_layout.count() == 0
+    palette_viewer.update_palette()
+    assert palette_viewer.frame_layout.count() == 28
+
+
+def test_palette_viewer_updates_on_theme_change(qtbot, palette_viewer):
+    light_window_text_color = palette_viewer.frame_layout.itemAt(1).itemAt(0).widget().text()
+    assert "(windowText)" in light_window_text_color
+    light_hex_color = light_window_text_color.split(" ")[0]
+
+    button = palette_viewer.findChild(DarkModeButton)
+    qtbot.mouseClick(button.mode_button, Qt.MouseButton.LeftButton)
+    qtbot.wait(100)
+
+    dark_window_text_color = palette_viewer.frame_layout.itemAt(1).itemAt(0).widget().text()
+    assert "(windowText)" in dark_window_text_color
+    dark_hex_color = dark_window_text_color.split(" ")[0]
+
+    assert light_hex_color != dark_hex_color