In test_build_ext, expose Path objects and use a path builder to buil…

…d content. Fixes some EncodingWarnings. Ref #232.

distutils/tests/test_build_ext.py

@@ -4,6 +4,7 @@
 import textwrap
 import site
 import contextlib
+import pathlib
 import platform
 import tempfile
 import importlib
@@ -12,6 +13,7 @@
 
 import path
 import pytest
+import jaraco.path
 
 from distutils.core import Distribution
 from distutils.command.build_ext import build_ext
@@ -38,6 +40,7 @@
 def user_site_dir(request):
     self = request.instance
     self.tmp_dir = self.mkdtemp()
+    self.tmp_path = path.Path(self.tmp_dir)
     from distutils.command import build_ext
 
     orig_user_base = site.USER_BASE
@@ -48,7 +51,7 @@ def user_site_dir(request):
     # bpo-30132: On Windows, a .pdb file may be created in the current
     # working directory. Create a temporary working directory to cleanup
     # everything at the end of the test.
-    with path.Path(self.tmp_dir):
+    with self.tmp_path:
         yield
 
     site.USER_BASE = orig_user_base
@@ -496,25 +499,22 @@ def _try_compile_deployment_target(self, operator, target):
         else:
             os.environ['MACOSX_DEPLOYMENT_TARGET'] = target
 
-        deptarget_c = os.path.join(self.tmp_dir, 'deptargetmodule.c')
+        jaraco.path.build(
+            {
+                'deptargetmodule.c': textwrap.dedent(f"""\
+                    #include <AvailabilityMacros.h>
 
-        with open(deptarget_c, 'w') as fp:
-            fp.write(
-                textwrap.dedent(
-                    """\
-                #include <AvailabilityMacros.h>
+                    int dummy;
 
-                int dummy;
+                    #if TARGET {operator} MAC_OS_X_VERSION_MIN_REQUIRED
+                    #else
+                    #error "Unexpected target"
+                    #endif
 
-                #if TARGET %s MAC_OS_X_VERSION_MIN_REQUIRED
-                #else
-                #error "Unexpected target"
-                #endif
-
-            """
-                    % operator
-                )
-            )
+                    """),
+            },
+            self.tmp_path,
+        )
 
         # get the deployment target that the interpreter was built with
         target = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
@@ -534,7 +534,7 @@ def _try_compile_deployment_target(self, operator, target):
                 target = '%02d0000' % target
         deptarget_ext = Extension(
             'deptarget',
-            [deptarget_c],
+            [self.tmp_path / 'deptargetmodule.c'],
             extra_compile_args=['-DTARGET={}'.format(target)],
         )
         dist = Distribution({'name': 'deptarget', 'ext_modules': [deptarget_ext]})