Add slice test

Author: dstansby

src/napari_matplotlib/tests/test_slice.py

@@ -0,0 +1,10 @@
+import numpy as np
+
+from napari_matplotlib import SliceWidget
+
+
+def test_scatter(make_napari_viewer):
+    # Smoke test adding a histogram widget
+    viewer = make_napari_viewer()
+    viewer.add_image(np.random.random((100, 100, 100)))
+    SliceWidget(viewer)