Issue #12120, Issue #12119: tests were missing a sys.dont_write_bytecode check

Lib/distutils/tests/test_build_py.py

@@ -58,7 +58,8 @@ class BuildPyTestCase(support.TempdirManager,
         pkgdest = os.path.join(destination, "pkg")
         files = os.listdir(pkgdest)
         self.assertTrue("__init__.py" in files)
-        self.assertTrue("__init__.pyc" in files)
+        if not sys.dont_write_bytecode:
+            self.assertTrue("__init__.pyc" in files)
         self.assertTrue("README.txt" in files)
 
     def test_empty_package_dir (self):

Lib/packaging/tests/test_command_build_py.py

@@ -61,7 +61,8 @@ class BuildPyTestCase(support.TempdirManager,
         pkgdest = os.path.join(destination, "pkg")
         files = os.listdir(pkgdest)
         self.assertIn("__init__.py", files)
-        self.assertIn("__init__.pyc", files)
+        if not sys.dont_write_bytecode:
+            self.assertIn("__init__.pyc", files)
         self.assertIn("README.txt", files)
 
     def test_empty_package_dir(self):

Misc/NEWS

@@ -153,6 +153,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #12120, #12119: skip a test in packaging and distutils
+  if sys.dont_write_bytecode is set to True.
+
 - Issue #12065: connect_ex() on an SSL socket now returns the original errno
   when the socket's timeout expires (it used to return None).