Added tox.ini and fix unit testing

tests/test_obs_img_utils_api.py

@@ -24,7 +24,7 @@
 from obs_img_utils.exceptions import PackageVersionExceptionOBS
 
 
-class TestAPI(object):
+class TestAPI:
     def setup(self):
         self.downloader = OBSImageUtil(
             'https://provo-mirror.opensuse.org/repositories/',
@@ -33,6 +33,9 @@ def setup(self):
             target_directory='tests/data'
         )
 
+    def setup_method(self, cls):
+        self.setup()
+
     def test_version_compare(self):
         result = self.downloader._version_compare('1.0', '2.0', '<=')
         assert result

tests/test_obs_img_utils_cli.py

@@ -237,7 +237,7 @@ def test_image_download(
               'apparmor-parser\n'
               '\n'
               '2.12.2\n'
-              'lp150.6.14.1\n'
+              '\n'
               'n\n'
               'y\n'
               'GPL\n'

tox.ini

@@ -0,0 +1,52 @@
+[tox]
+minversion = 3.3.0
+isolated_build = True
+skip_missing_interpreters = True
+skipsdist = True
+envlist =
+    unit_py3,
+    check
+
+
+[testenv]
+whitelist_externals =
+    /bin/bash
+basepython =
+    check: python3
+    unit_py3: python3
+envdir =
+    check: {toxworkdir}/3
+    unit_py3: {toxworkdir}/3
+passenv =
+    *
+usedevelop = True
+deps =
+    -r requirements-dev.txt
+
+
+# Unit Test run with basepython set to 3.x
+[testenv:unit_py3]
+skip_install = True
+usedevelop = True
+setenv =
+    PYTHONPATH={toxinidir}/tests
+    PYTHONUNBUFFERED=yes
+    WITH_COVERAGE=yes
+passenv =
+    *
+deps = {[testenv]deps}
+commands =
+    python3 setup.py develop
+    py.test --no-cov-on-fail --cov=obs_img_utils \
+        --cov-report=term-missing --cov-fail-under=90 --cov-config .coveragerc
+
+
+
+# Source code quality/integrity check
+[testenv:check]
+deps = {[testenv]deps}
+skip_install = True
+usedevelop = True
+commands =
+    flake8 --statistics -j auto --count {toxinidir}/obs_img_utils
+    flake8 --statistics -j auto --count {toxinidir}/tests