Switch to pytest

nose has not seen active development for many years now. With py310, we
can no longer use it due to import errors.

Also update lower contraints

Closes-Bug: #1993531
Change-Id: I215ba0d4654c9c637c3b97953d8659ac80892db8

.probetests

@@ -3,7 +3,7 @@
 SRC_DIR=$(dirname $(realpath "$0"))
 
 cd ${SRC_DIR}/test/probe
-nosetests --exe $@
+pytest $@
 rvalue=$?
 cd -
 

.unittests

@@ -3,7 +3,7 @@
 TOP_DIR=$(dirname $(realpath "$0"))
 
 cd $TOP_DIR/test/unit
-nosetests --exe --with-coverage --cover-package swift --cover-erase --cover-branches --cover-html --cover-html-dir="$TOP_DIR"/cover $@
+pytest --cov-report=html:"$TOP_DIR"/cover $@
 rvalue=$?
 rm -f .coverage
 cd -

.zuul.yaml

@@ -25,9 +25,6 @@
     vars:
       tox_envlist: py27
       python_version: 2.7
-      tox_environment:
-        NOSE_COVER_HTML: 1
-        NOSE_COVER_HTML_DIR: '{toxinidir}/cover'
     post-run: tools/playbooks/common/cover-post.yaml
 
 - job:
@@ -52,9 +49,6 @@
       tox_envlist: py36
       bindep_profile: test py36
       python_version: 3.6
-      tox_environment:
-        NOSE_COVER_HTML: 1
-        NOSE_COVER_HTML_DIR: '{toxinidir}/cover'
     post-run: tools/playbooks/common/cover-post.yaml
 
 - job:
@@ -76,9 +70,6 @@
       tox_envlist: py37
       bindep_profile: test py37
       python_version: 3.7
-      tox_environment:
-        NOSE_COVER_HTML: 1
-        NOSE_COVER_HTML_DIR: '{toxinidir}/cover'
     post-run: tools/playbooks/common/cover-post.yaml
 
 - job:
@@ -95,9 +86,6 @@
       tox_envlist: py38
       bindep_profile: test py38
       python_version: 3.8
-      tox_environment:
-        NOSE_COVER_HTML: 1
-        NOSE_COVER_HTML_DIR: '{toxinidir}/cover'
     post-run: tools/playbooks/common/cover-post.yaml
 
 - job:
@@ -130,9 +118,6 @@
       tox_envlist: py39
       bindep_profile: test py39
       python_version: 3.9
-      tox_environment:
-        NOSE_COVER_HTML: 1
-        NOSE_COVER_HTML_DIR: '{toxinidir}/cover'
     post-run: tools/playbooks/common/cover-post.yaml
 
 - job:

CONTRIBUTING.rst

@@ -145,11 +145,11 @@ Running the tests above against Swift in your development environment
 to be both tested and documented and all tests should pass.
 
 If you want to run just a subset of the tests while you are developing,
-you can use nosetests:
+you can use pytest:
 
 .. code-block:: console
 
-    cd test/unit/common/middleware/ && nosetests test_healthcheck.py
+    cd test/unit/common/middleware/ && pytest test_healthcheck.py
 
 To check which parts of your code are being exercised by a test, you can
 run tox and then point your browser to swift/cover/index.html:

doc/source/development_guidelines.rst

@@ -197,7 +197,7 @@ edited to provide AWS key IDs and secrets. Alternatively, an AWS CLI style
 credentials file can be loaded by setting the ``SWIFT_TEST_AWS_CONFIG_FILE``
 environment variable, e.g.::
 
-    SWIFT_TEST_AWS_CONFIG_FILE=~/.aws/credentials nosetests ./test/s3api
+    SWIFT_TEST_AWS_CONFIG_FILE=~/.aws/credentials pytest ./test/s3api
 
 .. note::
   When using ``SWIFT_TEST_AWS_CONFIG_FILE``, the region defaults to

lower-constraints.txt

@@ -11,7 +11,7 @@ cffi==1.11.5
 chardet==3.0.4
 cliff==2.11.0
 cmd2==0.8.1
-coverage==3.6
+coverage==5.0.4
 cryptography==2.0.2
 debtcollector==1.19.0
 dnspython==1.15.0
@@ -40,9 +40,6 @@ monotonic==1.4
 msgpack==0.5.6
 netaddr==0.7.19
 netifaces==0.8
-nose==1.3.7
-nosehtmloutput==0.0.3
-nosexcover==1.0.10
 oslo.config==4.0.0
 oslo.i18n==3.20.0
 oslo.log==3.22.0
@@ -57,6 +54,8 @@ pykmip==0.7.0
 Pygments==2.2.0
 pyparsing==2.2.0
 pyperclip==1.6.0
+pytest==4.6.11
+pytest-cov==2.12.1
 python-keystoneclient==2.0.0
 python-mimeparse==1.6.0
 python-subunit==1.2.0

py2-constraints.txt

@@ -8,11 +8,8 @@ alabaster===0.7.12
 pbr===5.4.5
 oslo.i18n===3.25.1
 fixtures===3.0.0
-nose===1.3.7
-nosehtmloutput===0.0.7
 sphinxcontrib-websupport===1.1.2
 ipaddress===1.0.23
-nosexcover===1.0.11
 debtcollector===1.22.0
 MarkupSafe===1.1.1
 netaddr===0.7.19
@@ -79,3 +76,5 @@ setuptools===44.1.1
 pycadf===2.10.0
 smmap===3.0.5
 PasteDeploy==2.1.1
+pytest==4.6.11
+pytest-cov==2.12.1

py36-constraints.txt

@@ -40,9 +40,6 @@ mock==4.0.3
 msgpack==1.0.3
 netaddr==0.8.0
 netifaces==0.11.0
-nose==1.3.7
-nosehtmloutput==0.0.7
-nosexcover==1.0.11
 os-service-types==1.7.0
 oslo.cache==2.11.0
 oslo.config==8.8.0

test-requirements.txt

@@ -4,10 +4,9 @@
 
 # Hacking already pins down pep8, pyflakes and flake8
 hacking>=2.0,<2.1.0 # Apache-2.0
-coverage>=3.6 # Apache-2.0
-nose>=1.3.7 # LGPL
-nosexcover>=1.0.10 # BSD
-nosehtmloutput>=0.0.3 # Apache-2.0
+coverage>=5.0.4 # Apache-2.0
+pytest>=4.6.11  # MIT
+pytest-cov>=2.12.1  # MIT
 stestr>=2.0.0 # Apache-2.0
 mock>=2.0 # BSD
 python-swiftclient>=3.2.0

test/probe/test_sharder.py

@@ -19,7 +19,7 @@ import subprocess
 import unittest
 import uuid
 
-from nose import SkipTest
+from unittest import SkipTest
 import six
 from six.moves.urllib.parse import quote
 

tools/playbooks/common/install_dependencies.yaml

@@ -35,14 +35,17 @@
     - name: install python modules with pip
       pip: name={{ item }} state=present extra_args='--upgrade'
       with_items:
+        # For some reason, pip on py2 isn't smart enough to prevent us
+        # trying to install a too-new mock or attrs??
+        - 'mock<4'
+        - 'attrs<22.1.0'
+        # Order matters; install constrained versions *first*, then unconstrained
         - crudini
         - eventlet
-        - nose
         - pyeclib
+        - pytest
+        - pytest-cov
         - python-swiftclient
-        # For some reason, pip on py2 isn't smart enough to prevent us
-        # trying to install a too-new mock??
-        - 'mock<4'
 
     - name: install PasteDeploy - CentOS 7
       pip: name={{ item }} state=present extra_args='--upgrade'

tools/playbooks/probetests/run.yaml

@@ -21,6 +21,6 @@
       shell:
         cmd: |
           source ~/.bashrc
-          nosetests test/probe/ --with-id || nosetests --failed
+          pytest test/probe/ || pytest --last-failed test/probe/
         executable: /bin/bash
         chdir: '{{ zuul.project.src_dir }}'

tox.ini

@@ -3,13 +3,13 @@ envlist = py37,py27,pep8
 minversion = 2.3.2
 skipsdist = True
 
+[pytest]
+addopts = --verbose --cov=swift --cov-branch --cov-report=html:cover --cov-report term
+
 [testenv]
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
-         NOSE_WITH_COVERAGE=1
-         NOSE_COVER_BRANCHES=1
-         NOSE_COVER_HTML_DIR={toxinidir}/cover
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
@@ -17,7 +17,7 @@ deps =
 commands =
   find {envdir} ( -type f -o -type l ) -name "*.py[co]" -delete
   find {envdir} -type d -name "__pycache__" -delete
-  bash -ec "nosetests {posargs:test/unit} --with-id || nosetests --failed"
+  bash -ec "pytest {posargs:test/unit} || pytest --last-failed {posargs:test/unit}"
 allowlist_externals =
   bash
   find
@@ -27,7 +27,7 @@ passenv = SWIFT_* *_proxy
 usedevelop = False
 deps = {[testenv:py36]deps}
 commands =
-  nosetests {posargs:test/s3api}
+  pytest {posargs:test/s3api}
 passenv = SWIFT_* *_proxy
 
 [testenv:py27]
@@ -47,10 +47,6 @@ deps = {[testenv:py36]deps}
 
 [testenv:cover]
 setenv = VIRTUAL_ENV={envdir}
-         NOSE_WITH_COVERAGE=1
-         NOSE_COVER_BRANCHES=1
-         NOSE_COVER_HTML=1
-         NOSE_COVER_HTML_DIR={toxinidir}/cover
 
 [testenv:pep8]
 commands =