Changed default slice to 9 for test histrogram and slice

Author: ruaridhg

src/napari_matplotlib/tests/baseline/test_histogram_3D.png

@@ -23,6 +23,9 @@ def test_histogram_2D(make_napari_viewer, astronaut_data):
 def test_histogram_3D(make_napari_viewer, brain_data):
     viewer = make_napari_viewer()
     viewer.add_image(brain_data[0], **brain_data[1])
+    axis = viewer.dims.last_used
+    slice_no = 9
+    viewer.dims.set_current_step(axis, slice_no)
     fig = HistogramWidget(viewer).figure
     # Need to return a copy, as original figure is too eagerley garbage
     # collected by the widget

src/napari_matplotlib/tests/baseline/test_slice_3D.png

@@ -9,6 +9,9 @@
 def test_slice_3D(make_napari_viewer, brain_data):
     viewer = make_napari_viewer()
     viewer.add_image(brain_data[0], **brain_data[1])
+    axis = viewer.dims.last_used
+    slice_no = 9
+    viewer.dims.set_current_step(axis, slice_no)
     fig = SliceWidget(viewer).figure
     # Need to return a copy, as original figure is too eagerley garbage
     # collected by the widget