diff --git a/src/napari_matplotlib/tests/baseline/test_histogram_2D.png b/src/napari_matplotlib/tests/baseline/test_histogram_2D.png
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diff --git a/src/napari_matplotlib/tests/baseline/test_histogram_3D.png b/src/napari_matplotlib/tests/baseline/test_histogram_3D.png
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diff --git a/src/napari_matplotlib/tests/baseline/test_slice_2D.png b/src/napari_matplotlib/tests/baseline/test_slice_2D.png
new file mode 100644
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diff --git a/src/napari_matplotlib/tests/baseline/test_slice_3D.png b/src/napari_matplotlib/tests/baseline/test_slice_3D.png
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diff --git a/src/napari_matplotlib/tests/test_histogram.py b/src/napari_matplotlib/tests/test_histogram.py
index fa463642..e397029c 100644
--- a/src/napari_matplotlib/tests/test_histogram.py
+++ b/src/napari_matplotlib/tests/test_histogram.py
@@ -6,7 +6,7 @@
 
 
 @pytest.mark.mpl_image_compare
-def test_example_q_widget(make_napari_viewer, astronaut_data):
+def test_histogram_2D(make_napari_viewer, astronaut_data):
     # Smoke test adding a histogram widget
     viewer = make_napari_viewer()
     viewer.add_image(astronaut_data[0], **astronaut_data[1])
@@ -14,3 +14,14 @@ def test_example_q_widget(make_napari_viewer, astronaut_data):
     # Need to return a copy, as original figure is too eagerley garbage
     # collected by the widget
     return deepcopy(fig)
+
+
+@pytest.mark.mpl_image_compare
+def test_histogram_3D(make_napari_viewer, brain_data):
+    # Smoke test adding a histogram widget
+    viewer = make_napari_viewer()
+    viewer.add_image(brain_data[0], **brain_data[1])
+    fig = HistogramWidget(viewer).figure
+    # Need to return a copy, as original figure is too eagerley garbage
+    # collected by the widget
+    return deepcopy(fig)
diff --git a/src/napari_matplotlib/tests/test_slice.py b/src/napari_matplotlib/tests/test_slice.py
index 9905ad85..500d5ec0 100644
--- a/src/napari_matplotlib/tests/test_slice.py
+++ b/src/napari_matplotlib/tests/test_slice.py
@@ -6,10 +6,20 @@
 
 
 @pytest.mark.mpl_image_compare
-def test_slice(make_napari_viewer, brain_data):
+def test_slice_3D(make_napari_viewer, brain_data):
     viewer = make_napari_viewer()
     viewer.add_image(brain_data[0], **brain_data[1])
     fig = SliceWidget(viewer).figure
     # Need to return a copy, as original figure is too eagerley garbage
     # collected by the widget
     return deepcopy(fig)
+
+
+@pytest.mark.mpl_image_compare
+def test_slice_2D(make_napari_viewer, astronaut_data):
+    viewer = make_napari_viewer()
+    viewer.add_image(astronaut_data[0], **astronaut_data[1])
+    fig = SliceWidget(viewer).figure
+    # Need to return a copy, as original figure is too eagerley garbage
+    # collected by the widget
+    return deepcopy(fig)