MNT: Add pytest-doctestplus to ignore warnings in doctests

Author: effigies

.travis.yml

@@ -147,7 +147,7 @@ script:
           mkdir for_testing
           cd for_testing
           cp ../.coveragerc .
-          pytest --doctest-modules --cov nibabel -v --pyargs nibabel
+          pytest --doctest-modules --doctest-plus --cov nibabel -v --pyargs nibabel
       else
           false
       fi

nibabel/cifti2/cifti2.py

@@ -1492,7 +1492,7 @@ def update_headers(self):
 
         >>> import numpy as np
         >>> data = np.zeros((2,3,4))
-        >>> img = Cifti2Image(data)
+        >>> img = Cifti2Image(data)  # doctest: +IGNORE_WARNINGS
         >>> img.shape == (2, 3, 4)
         True
         >>> img.update_headers()

setup.cfg

@@ -58,6 +58,7 @@ test =
     coverage
     pytest !=5.3.4
     pytest-cov
+    pytest-doctestplus
 all =
     %(dicomfs)s
     %(dev)s