In test_build_py, rely on tree builder to build trees. Ref #232.

distutils/tests/test_build_py.py

@@ -4,6 +4,7 @@
 import sys
 
 import pytest
+import jaraco.path
 
 from distutils.command.build_py import build_py
 from distutils.core import Distribution
@@ -16,16 +17,13 @@
 class TestBuildPy(support.TempdirManager):
     def test_package_data(self):
         sources = self.mkdtemp()
-        f = open(os.path.join(sources, "__init__.py"), "w")
-        try:
-            f.write("# Pretend this is a package.")
-        finally:
-            f.close()
-        f = open(os.path.join(sources, "README.txt"), "w")
-        try:
-            f.write("Info about this package")
-        finally:
-            f.close()
+        jaraco.path.build(
+            {
+                '__init__.py': "# Pretend this is a package.",
+                'README.txt': 'Info about this package',
+            },
+            sources,
+        )
 
         destination = self.mkdtemp()
 
@@ -62,11 +60,7 @@ def test_package_data(self):
     def test_empty_package_dir(self):
         # See bugs #1668596/#1720897
         sources = self.mkdtemp()
-        open(os.path.join(sources, "__init__.py"), "w").close()
-
-        testdir = os.path.join(sources, "doc")
-        os.mkdir(testdir)
-        open(os.path.join(testdir, "testfile"), "w").close()
+        jaraco.path.build({'__init__.py': '', 'doc': {'testfile': ''}}, sources)
 
         os.chdir(sources)
         dist = Distribution({
@@ -124,17 +118,19 @@ def test_dir_in_package_data(self):
         """
         # See bug 19286
         sources = self.mkdtemp()
-        pkg_dir = os.path.join(sources, "pkg")
-
-        os.mkdir(pkg_dir)
-        open(os.path.join(pkg_dir, "__init__.py"), "w").close()
-
-        docdir = os.path.join(pkg_dir, "doc")
-        os.mkdir(docdir)
-        open(os.path.join(docdir, "testfile"), "w").close()
-
-        # create the directory that could be incorrectly detected as a file
-        os.mkdir(os.path.join(docdir, 'otherdir'))
+        jaraco.path.build(
+            {
+                'pkg': {
+                    '__init__.py': '',
+                    'doc': {
+                        'testfile': '',
+                        # create a directory that could be incorrectly detected as a file
+                        'otherdir': {},
+                    },
+                }
+            },
+            sources,
+        )
 
         os.chdir(sources)
         dist = Distribution({"packages": ["pkg"], "package_data": {"pkg": ["doc/*"]}})
@@ -174,9 +170,8 @@ def test_namespace_package_does_not_warn(self, caplog):
         """
         # Create a fake project structure with a package namespace:
         tmp = self.mkdtemp()
+        jaraco.path.build({'ns': {'pkg': {'module.py': ''}}}, tmp)
         os.chdir(tmp)
-        os.makedirs("ns/pkg")
-        open("ns/pkg/module.py", "w").close()
 
         # Configure the package:
         attrs = {