Skip failing tests on systems with ASCII locale

- closes #623

2 files changed, 15 insertions, 4 deletions

diff --git a/CHANGES.md b/CHANGES.md
index c11d2c9..f349ead 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -11,6 +11,8 @@ The released versions correspond to PyPi releases.
 
 ### Infrastructure
 * added test dependency check (see [#608](../../issues/608))
+* skip tests failing with ASCII locale
+  (see [#623](../../issues/623))
 
 ## [Version 4.5.0](https://pypi.python.org/pypi/pyfakefs/4.5.0) (2021-06-04)
 Adds some support for Python 3.10 and basic type checking.
diff --git a/pyfakefs/tests/fake_open_test.py b/pyfakefs/tests/fake_open_test.py
index 29345ea..9e942f9 100644
--- a/pyfakefs/tests/fake_open_test.py
+++ b/pyfakefs/tests/fake_open_test.py
@@ -93,8 +93,13 @@ class FakeFileOpenTest(FakeFileOpenTestBase):
         # by the locale preferred encoding - which under Windows is
         # usually not UTF-8, but something like Latin1, depending on the locale
         text_fractions = 'Ümläüts'
-        with self.open(file_path, 'w') as f:
-            f.write(text_fractions)
+        try:
+            with self.open(file_path, 'w') as f:
+                f.write(text_fractions)
+        except UnicodeEncodeError:
+            # see https://github.com/jmcgeheeiv/pyfakefs/issues/623
+            self.skipTest("This test does not work with an ASCII locale")
+
         with self.open(file_path) as f:
             contents = f.read()
         self.assertEqual(contents, text_fractions)
@@ -113,8 +118,12 @@ class FakeFileOpenTest(FakeFileOpenTestBase):
     def test_write_str_read_bytes(self):
         file_path = self.make_path('foo')
         str_contents = 'Äsgül'
-        with self.open(file_path, 'w') as f:
-            f.write(str_contents)
+        try:
+            with self.open(file_path, 'w') as f:
+                f.write(str_contents)
+        except UnicodeEncodeError:
+            # see https://github.com/jmcgeheeiv/pyfakefs/issues/623
+            self.skipTest("This test does not work with an ASCII locale")
         with self.open(file_path, 'rb') as f:
             contents = f.read()
         self.assertEqual(str_contents, contents.decode(