Use testr instead of nosetests

This commit replaces the use of nosetests with testr to be consistent
with the tools used elsewhere in OpenStack. The required changes were
minimum.

A test was duplicated to avoid a duplication id error in testr. This
could be refactored using mixins in follow-up patches.

Change-Id: Ic854fec120992db99dcb47cc90e5ca785c9bd056

.testr.conf

@@ -2,6 +2,6 @@
 test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
              OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
              OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-60} \
-             ${PYTHON:-python} -m subunit.run discover -t ./ . $LISTOPT $IDOPTION
+             ${PYTHON:-python} -m subunit.run discover -t ${OS_TOP_LEVEL:-./} ${OS_TEST_PATH:-./tests/unit} $LISTOPT $IDOPTION
 test_id_option=--load-list $IDFILE
 test_list_option=--list

tests/unit/swift/storlet_middleware/handlers/__init__.py

@@ -44,12 +44,6 @@ class BaseTestStorletMiddleware(unittest.TestCase):
             factory = storlet_handler.filter_factory(global_conf, **local_conf)
             return factory(app)
 
-    def test_load_app(self):
-        try:
-            self.get_app(self.base_app, self.conf)
-        except Exception:
-            self.fail('Application loading got an error')
-
     def get_response(self, req):
         app = self.get_app(self.base_app, self.conf)
         return req.get_response(app)

tests/unit/swift/storlet_middleware/handlers/test_obj.py

@@ -27,6 +27,12 @@ class TestStorletMiddlewareObject(BaseTestStorletMiddleware):
     def setUp(self):
         super(TestStorletMiddlewareObject, self).setUp(exec_server='object')
 
+    def test_load_app(self):
+        try:
+            self.get_app(self.base_app, self.conf)
+        except Exception:
+            self.fail('Application loading got an error')
+
     def test_call_unsupported_method(self):
         def call(method):
             path = '/sda1/p/AUTH_a/c/o'

tests/unit/swift/storlet_middleware/handlers/test_proxy.py

@@ -44,6 +44,12 @@ class TestStorletMiddlewareProxy(BaseTestStorletMiddleware):
     def setUp(self):
         super(TestStorletMiddlewareProxy, self).setUp(exec_server='proxy')
 
+    def test_load_app(self):
+        try:
+            self.get_app(self.base_app, self.conf)
+        except Exception:
+            self.fail('Application loading got an error')
+
     def test_GET_without_storlets(self):
         def basic_get(path):
             req = Request.blank(

tox.ini

@@ -16,7 +16,7 @@ deps =
 commands =
     find . -type f -name "*.py[c|o]" -delete
     find . -type d -name "__pycache__" -delete
-    nosetests {posargs:tests/unit} -v
+    python setup.py testr --slowest --testr-args='--concurrency 1 {posargs:tests.unit}'
 
 whitelist_externals = bash
                       find
@@ -42,7 +42,7 @@ commands = ./.functests jenkins
 commands = {posargs}
 
 [testenv:cover]
-commands = python setup.py test --coverage --testr-args='{posargs}'
+commands = python setup.py testr --coverage --testr-args='{posargs}'
 
 [testenv:docs]
 commands = python setup.py build_sphinx