Test setup - Centralize list of dependencies.

Creating central place for list of required test libs by listing them in
a dedicated 'extra_requires' section in the setup.py.
Now adding test libs can be done by using:
`pip install smrf[tests]`
and utilized by tox and the build scripts that way too.

.travis.yml

@@ -20,6 +20,7 @@ env:
     - CIBW_MANYLINUX_X86_64_IMAGE=manylinux2014
     - CIBW_TEST_REQUIRES=nose
     - CIBW_TEST_COMMAND="NOT_ON_GOLD_HOST=yup nosetests -vv --exe smrf"
+    - CIBW_TEST_EXTRAS=tests
     - CIBW_BUILD="cp3*-manylinux_x86_64 cp3*-macosx_x86_64"
     - CIBW_SKIP="?p27* pp* cp35*"
     - CIBW_BUILD_VERBOSITY=1
@@ -45,7 +46,7 @@ unittest: &unittest
       packages:
         - eccodes
         - gcc@7
-  install: 
+  install:
     - python3 --version
     - python3 -m pip install tox-travis cython
   script: tox
@@ -99,7 +100,7 @@ jobs:
       python: 3.6
       install: skip
       script: travis/build-sdist.sh
-          
+
     # Deploy on linux
     - <<: *ci-build-wheels
       name: Build and deploy Linux wheels

requirements_dev.txt

@@ -10,5 +10,4 @@ pydata-sphinx-theme
 sphinxcontrib-bibtex>=1.0
 sphinxcontrib-websupport>=1.0.1
 pygit2
-mock
 git+https://github.com/USDA-ARS-NWRC/goldmeister.git@main

setup.py

@@ -142,6 +142,9 @@ def finalize_options(self):
             'sphinxcontrib-bibtex',
             'sphinxcontrib-websupport',
             'pydata-sphinx-theme'
+        ],
+        'tests': [
+            'mock',
         ]
     },
     use_scm_version={

tox.ini

@@ -38,9 +38,11 @@ commands =
     make clean-build clean-pyc
     python3 setup.py test
 
+extras =
+    tests
+
 deps =
     -rrequirements.txt
-    mock
 
 whitelist_externals =
     make

travis/build-sdist.sh

@@ -9,4 +9,4 @@ if [ ! -z "$TRAVIS_TAG" ]
 then
     python3 -m pip install twine
     python3 -m twine upload --skip-existing dist/*.tar.gz
-fi
+fi