add -pylib tox environment

Author: asottile

.github/workflows/test.yml

@@ -66,7 +66,7 @@ jobs:
           - name: "windows-py37-pluggy"
             python: "3.7"
             os: windows-latest
-            tox_env: "py37-pluggymain-xdist"
+            tox_env: "py37-pluggymain-pylib-xdist"
           - name: "windows-py38"
             python: "3.8"
             os: windows-latest
@@ -93,7 +93,7 @@ jobs:
           - name: "ubuntu-py37-pluggy"
             python: "3.7"
             os: ubuntu-latest
-            tox_env: "py37-pluggymain-xdist"
+            tox_env: "py37-pluggymain-pylib-xdist"
           - name: "ubuntu-py37-freeze"
             python: "3.7"
             os: ubuntu-latest

tox.ini

@@ -10,7 +10,7 @@ envlist =
     py310
     py311
     pypy3
-    py37-{pexpect,xdist,unittestextras,numpy,pluggymain}
+    py37-{pexpect,xdist,unittestextras,numpy,pluggymain,pylib}
     doctesting
     plugins
     py37-freeze
@@ -54,6 +54,7 @@ deps =
     numpy: numpy>=1.19.4
     pexpect: pexpect>=4.8.0
     pluggymain: pluggy @ git+https://github.com/pytest-dev/pluggy.git
+    pylib: py>=1.8.2
     unittestextras: twisted
     unittestextras: asynctest
     xdist: pytest-xdist>=2.1.0