Fix CI due to latest pip output change (tox-dev#1579)

Author: gaborbernat

tests/unit/test_z_cmdline.py

@@ -337,8 +337,8 @@ def test_venv_special_chars_issue252(cmd, initproj):
     )
     result = cmd()
     result.assert_success()
-    pattern = re.compile("special&&1 installed: .*pkg123==0.7.*")
-    assert any(pattern.match(line) for line in result.outlines), result.outlines
+    pattern = re.compile("special&&1 installed: .*pkg123 @ .*-0.7.zip.*")
+    assert any(pattern.match(line) for line in result.outlines), "\n".join(result.outlines)
 
 
 def test_unknown_environment(cmd, initproj):

tox.ini

@@ -11,7 +11,7 @@ envlist = py27,
           fix_lint,
           docs,
           package_description
-minversion = 3.7
+minversion = 3.12
 isolated_build = true
 skip_missing_interpreters = true
 
@@ -20,6 +20,7 @@ description = run the tests with pytest under {basepython}
 setenv =
     PIP_DISABLE_PIP_VERSION_CHECK = 1
     COVERAGE_FILE = {env:COVERAGE_FILE:{toxworkdir}/.coverage.{envname}}
+    {py27,pypy}: PYTHONWARNINGS=ignore:DEPRECATION::pip._internal.cli.base_command
 passenv =
     CURL_CA_BUNDLE
     http_proxy
@@ -30,7 +31,7 @@ passenv =
     PYTEST_*
     PIP_CACHE_DIR
 deps =
-    pip >= 19.3.1
+    pip >= 20.1
 extras = testing
 commands = pytest \
            --cov "{envsitepackagesdir}/tox" \