Add a test setup helper function

Add a function to set up a skimage test

Switch to new test helper function

Import local packages that raise warnings in test setup function

More fixes to doctests

Fix regionprops doc test

Try and fix the test_rank failure.

Remove no longer needed RectangleSelector shim

Skip more doctests in _regionprops

Try importing another scipy subpackage

skimage/_shared/testing.py

@@ -10,6 +10,7 @@ from skimage import (
 from numpy import testing
 import numpy as np
 from skimage._shared.utils import all_warnings
+import warnings
 
 
 SKIP_RE = re.compile("(\s*>>>.*?)(\s*)#\s*skip\s+if\s+(.*)$")
@@ -177,6 +178,12 @@ def mono_check(plugin, fmt='png'):
     testing.assert_allclose(r5, img5)
 
 
+def setup_test():
+   from scipy import signal, ndimage, special, optimize, linalg
+   from skimage import filter, viewer
+   warnings.simplefilter('error')
+
+
 if __name__ == '__main__':
     color_check('pil')
     mono_check('pil')