diff --git a/src/napari_matplotlib/tests/test_ui.py b/src/napari_matplotlib/tests/test_ui.py
new file mode 100644
index 00000000..3b30ad3a
--- /dev/null
+++ b/src/napari_matplotlib/tests/test_ui.py
@@ -0,0 +1,49 @@
+import pytest
+from qtpy.QtCore import QSize
+from qtpy.QtGui import QImage
+
+from napari_matplotlib import HistogramWidget, ScatterWidget, SliceWidget
+
+
+def _are_different(a: QImage, b: QImage) -> bool:
+ """
+ Check that a and b are identical, pixel by pixel. Via a stupid nested for loop.
+ """
+ assert not a.isNull()
+ assert not b.isNull()
+ assert a.size() == b.size()
+ for x in range(a.width()):
+ for y in range(a.height()):
+ if a.pixel(x, y) != b.pixel(x, y):
+ return True # exit quickly
+ return False
+
+
+@pytest.mark.parametrize(
+ "Widget", [HistogramWidget, ScatterWidget, SliceWidget]
+)
+def test_mpl_toolbar_buttons_checked(make_napari_viewer, Widget):
+ """Test that the icons for checkable actions change when when a tool is selected.
+
+ A simple test of NapariNavigationToolbar._update_buttons_checked. Make sure the
+ checked and unchecked icons are not the same.
+ """
+ checkable_actions = ["Zoom", "Pan"]
+
+ viewer = make_napari_viewer()
+ widget = Widget(viewer)
+
+ # search through all of the icons for the ones whose icons are expected to
+ # change when checked
+ for action in widget.toolbar.actions():
+ if action.text() in checkable_actions:
+ assert action.isChecked() is False
+ assert action.isCheckable() is True
+ unchecked = action.icon().pixmap(QSize(48, 48)).toImage()
+
+ # simulate the user click (QTest.mouseClick can't take a QAction)
+ action.trigger()
+
+ assert action.isChecked() is True
+ checked = action.icon().pixmap(QSize(48, 48)).toImage()
+ assert _are_different(unchecked, checked)
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