Run tests with pytest instead of nose (#863)

Official nose documentation recommends users migrate to a more supported
platform.

.github/workflows/ci.yaml

@@ -31,10 +31,10 @@ jobs:
           python -m pip install --upgrade pip setuptools
           python -m pip install PyYAML argparse rospkg vcstools catkin_pkg python-dateutil rosdistro
           python -m pip install -e .
-          python -m pip install nose coverage flake8 mock codecov
+          python -m pip install pytest pytest-cov flake8 mock codecov
       - name: Run tests
         run: |
-          python -m nose --with-coverage --cover-package=rosdep2 --with-xunit test
+          python -m pytest test --cov
       - name: Check coverage
         run: |
           python -m codecov

Makefile

@@ -27,4 +27,4 @@ testsetup:
 	echo "running rosdep tests"
 
 test: testsetup
-	nosetests --with-coverage --cover-package=rosdep2 --with-xunit test
+	cd test && pytest

doc/developers_guide.rst

@@ -121,11 +121,11 @@ Setup
 
 ::
 
-    pip install nose
+    pip install pytest
     pip install mock
 
 
-rosdep2 uses `Python nose <http://readthedocs.org/docs/nose/en/latest/>`_
+rosdep2 uses `pytest <http://docs.pytest.org>`_
 for testing, which is a fairly simple and straightfoward test
 framework.  You just have to write a function start with the name
 ``test`` and use normal ``assert`` statements for your tests.
@@ -138,7 +138,7 @@ You can run the tests, including coverage, as follows:
 ::
 
     cd rosdep2/test
-    nosetests
+    pytest
 
 
 Documentation

setup.cfg

@@ -0,0 +1,5 @@
+[tool:pytest]
+junit_suite_name = rosdep
+
+[coverage:run]
+source = rosdep2

setup.py

@@ -10,8 +10,7 @@
     'packages': ['rosdep2', 'rosdep2.ament_packages', 'rosdep2.platforms'],
     'package_dir': {'': 'src'},
     'install_requires': ['catkin_pkg >= 0.4.0', 'rospkg >= 1.3.0', 'rosdistro >= 0.7.5', 'PyYAML >= 3.1'],
-    'test_suite': 'nose.collector',
-    'test_requires': ['mock', 'nose >= 1.0'],
+    'test_requires': ['mock', 'pytest'],
     'author': 'Tully Foote, Ken Conley',
     'author_email': '[email protected]',
     'url': 'http://wiki.ros.org/rosdep',

test/__init__.py

@@ -0,0 +1,6 @@
+import os
+import sys
+
+sys.path.insert(0, os.path.join(
+    os.path.dirname(os.path.dirname(os.path.realpath(__file__))),
+    'src'))