Skip failing build_env tests on Azure MacOS

Author: pradyunsg

.azure-pipelines/macos.yml

@@ -1,5 +1,6 @@
 variables:
   CI: true
+  PIP_CI_MACOS_AZURE: true
 
 jobs:
 - template: jobs/test.yml

tests/functional/test_build_env.py

@@ -3,7 +3,11 @@
 import pytest
 
 from pip._internal.build_env import BuildEnvironment
-from tests.lib import create_basic_wheel_for_package, make_test_finder
+from tests.lib import (
+    create_basic_wheel_for_package,
+    make_test_finder,
+    skip_if_azure_macos,
+)
 
 
 def indent(text, prefix):
@@ -91,6 +95,7 @@ def test_build_env_allow_only_one_install(script):
                 'installing in {prefix}'.format(**locals()))
 
 
+@skip_if_azure_macos
 def test_build_env_requirements_check(script):
 
     create_basic_wheel_for_package(script, 'foo', '2.0')
@@ -149,6 +154,7 @@ def test_build_env_requirements_check(script):
         ''')
 
 
+@skip_if_azure_macos
 def test_build_env_overlay_prefix_has_priority(script):
     create_basic_wheel_for_package(script, 'pkg', '2.0')
     create_basic_wheel_for_package(script, 'pkg', '4.3')
@@ -168,6 +174,7 @@ def test_build_env_overlay_prefix_has_priority(script):
     assert result.stdout.strip() == '2.0', str(result)
 
 
+@skip_if_azure_macos
 @pytest.mark.incompatible_with_test_venv
 def test_build_env_isolation(script):
 

tests/lib/__init__.py

@@ -1166,6 +1166,10 @@ def need_mercurial(fn):
 
 skip_if_python2 = pytest.mark.skipif(PY2, reason="Non-Python 2 only")
 skip_if_not_python2 = pytest.mark.skipif(not PY2, reason="Python 2 only")
+skip_if_azure_macos = pytest.mark.skipif(
+    "PIP_CI_MACOS_AZURE" in os.environ,
+    reason="MacOS on Azure Pipelines generates wrong temporary files"
+)
 
 
 # Workaround for test failures after new wheel release.