Set pip environment variables even if devmode is disabled.

repo_helper/files/testing.py

@@ -105,6 +105,29 @@ class ToxConfig(IniConfigurator):
 			"pytest",
 			]
 
+	def get_setenv(self, prefer_binary: bool = True, setuptools_stdlib=True) -> List[str]:
+		"""
+		Return environment variables to be set in the testenv.
+
+		:param prefer_binary: Whether pip should be configured to prefer older binary packages over newer source packages.
+		:param setuptools_stdlib: Whether setuptools should be configured to use the stdlib distutils.
+		"""
+
+		setenv = []
+
+		if self["enable_devmode"]:
+			setenv.append("PYTHONDEVMODE=1")
+
+		setenv.append("PIP_DISABLE_PIP_VERSION_CHECK=1")
+
+		if prefer_binary:
+			setenv.append("PIP_PREFER_BINARY=1")
+
+		if setuptools_stdlib:
+			setenv.append("SETUPTOOLS_USE_DISTUTILS=stdlib")
+
+		return setenv
+
 	def __init__(self, repo_path: pathlib.Path, templates: Environment):
 		self._globals = templates.globals
 
@@ -306,10 +329,7 @@ def testenv(self) -> None:
 		``[testenv]``.
 		"""
 
-		if self["enable_devmode"]:
-			self._ini["testenv"]["setenv"] = indent_join(
-					("PYTHONDEVMODE=1", "PIP_DISABLE_PIP_VERSION_CHECK=1", "SETUPTOOLS_USE_DISTUTILS=stdlib")
-					)
+		self._ini["testenv"]["setenv"] = indent_join(self.get_setenv(False))
 
 		if self["enable_tests"]:
 
@@ -391,19 +411,15 @@ def testenv_py312_dev(self) -> None:
 
 		for fixup_version in ["3.12-dev", "3.12", "3.13-dev"]:
 			if fixup_version in self["python_versions"]:
-				if self["enable_devmode"]:
-					env_name = f"testenv:py{fixup_version.replace('.', '')}"
-					if env_name in self._ini:
-						self._ini[env_name]["setenv"] = indent_join(
-								("PYTHONDEVMODE=1", "PIP_DISABLE_PIP_VERSION_CHECK=1")
-								)
+				setenv = self.get_setenv(False, False)
+				env_name = f"testenv:py{fixup_version.replace('.', '')}"
+				if env_name in self._ini:
+					self._ini[env_name]["setenv"] = indent_join(setenv)
 
-					for env in third_party_envs:
-						env_name = f"testenv:py{fixup_version.replace('.', '')}-{env}"
-						self._ini.add_section(env_name)
-						self._ini[env_name]["setenv"] = indent_join(
-								("PYTHONDEVMODE=1", "PIP_DISABLE_PIP_VERSION_CHECK=1")
-								)
+				for env in third_party_envs:
+					env_name = f"testenv:py{fixup_version.replace('.', '')}-{env}"
+					self._ini.add_section(env_name)
+					self._ini[env_name]["setenv"] = indent_join(setenv)
 
 			else:
 				self._ini.remove_section(f"testenv:py{fixup_version.replace('.', '')}")
@@ -416,10 +432,7 @@ def testenv__package(self) -> None:
 		"""
 
 		if self["enable_devmode"]:
-			self._ini["testenv:.package"]["setenv"] = indent_join(
-					("PYTHONDEVMODE=1", "PIP_DISABLE_PIP_VERSION_CHECK=1")
-					)
-
+			self._ini["testenv:.package"]["setenv"] = indent_join(self.get_setenv(False, False))
 		else:
 			self._ini.remove_section("testenv:.package")
 
@@ -456,11 +469,7 @@ def testenv_build(self) -> None:
 		``[testenv:build]``.
 		"""
 
-		if self["enable_devmode"]:
-			self._ini["testenv:build"]["setenv"] = indent_join(
-					("PYTHONDEVMODE=1", "PIP_DISABLE_PIP_VERSION_CHECK=1", "PIP_PREFER_BINARY=1")
-					)
-
+		self._ini["testenv:build"]["setenv"] = indent_join(self.get_setenv(setuptools_stdlib=False))
 		self._ini["testenv:build"]["skip_install"] = True
 		self._ini["testenv:build"]["changedir"] = "{toxinidir}"
 		self._ini["testenv:build"]["deps"] = indent_join([

tests/test_files/test_testing_/test_make_tox_matrix.ini

@@ -44,6 +44,9 @@ qa = mypy, lint
 cov = py36-attrs19.3, coverage
 
 [testenv]
+setenv =
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+    SETUPTOOLS_USE_DISTUTILS=stdlib
 deps =
     -r{toxinidir}/tests/requirements.txt
     attrs19.3: attrs~=19.3.0
@@ -55,6 +58,9 @@ commands =
     python -m pytest --cov=hello_world -r aR tests/ {posargs}
 
 [testenv:build]
+setenv =
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+    PIP_PREFER_BINARY=1
 skip_install = True
 changedir = {toxinidir}
 deps =

tests/test_files/test_testing_/test_tox_enable_devmode_no_devmode_.ini

@@ -36,6 +36,9 @@ qa = mypy, lint
 cov = py36, coverage
 
 [testenv]
+setenv =
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+    SETUPTOOLS_USE_DISTUTILS=stdlib
 deps = -r{toxinidir}/tests/requirements.txt
 commands =
     python --version
@@ -50,6 +53,9 @@ deps = -r{toxinidir}/doc-source/requirements.txt
 commands = sphinx-build -M {env:SPHINX_BUILDER:html} . ./build {posargs}
 
 [testenv:build]
+setenv =
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+    PIP_PREFER_BINARY=1
 skip_install = True
 changedir = {toxinidir}
 deps =