Replace nose with pytest

Attempt replacing `nose` (which has not been regularly supported for years) with `pytest` for better CI/CD experience.

Signed-off-by: Michael Tiemann <72577720+MichaelTiemannOSC@users.noreply.github.com>

INSTALL.txt

@@ -19,10 +19,4 @@ or, if additional access rights are needed (Unix):
 testing framework.  This can be achieved for instance with a command
 like
 
-  nosetests -sv uncertainties/
-
-or simply
-
-  nosetests uncertainties/
-
-(for a less verbose output).
+  pytest uncertainties/

appveyor.yml

@@ -47,7 +47,7 @@ install:
   - conda init cmd.exe
   - conda info -a
   # Create a conda virtual environement 
-  - "conda create -n uncty-env numpy nose python=%PYTHON_VERSION%"
+  - "conda create -n uncty-env numpy pytest python=%PYTHON_VERSION%"
   - activate uncty-env
 
 

setup.py

@@ -339,7 +339,7 @@
 
         install_requires=['future'],
 
-        tests_require=['nose', 'numpy'],
+        tests_require=['pytest', 'numpy'],
 
         # Optional dependencies install using:
         # `easy_install uncertainties[optional]`