Merge pull request #983 from pypa/appveyor-debug-failures

Debug Appveyor failures

.travis.yml

@@ -48,6 +48,8 @@ jobs:
       arch: s390x
       env: PYTHON=python
 
-install: $PYTHON -m pip install -e ".[dev]" pytest-custom-exit-code
+install:
+- $PYTHON -m pip install -U pip
+- $PYTHON -m pip install -e ".[dev]" pytest-custom-exit-code
 
 script: $PYTHON ./bin/run_tests.py

appveyor.yml

@@ -18,6 +18,7 @@ init:
       if (-not ($BRANCH -eq 'main' -or $BRANCH.ToLower().StartsWith('appveyor-'))) {
         $env:PYTEST_ADDOPTS='-k "unit_test or test_0_basic" --suppress-no-test-exit-code'
       }
+      python -m pip install -U pip
 
 install: python -m pip install -e ".[dev]" pytest-custom-exit-code
 

test/test_dependency_versions.py

@@ -119,7 +119,7 @@ def test_dependency_constraints_file(tmp_path, build_frontend_env):
         "pip": "20.0.2",
         "setuptools": "53.0.0",
         "wheel": "0.34.2",
-        "virtualenv": "20.0.35",
+        "virtualenv": "20.11.2",
     }
 
     constraints_file = tmp_path / "constraints file.txt"