1 files changed, 46 insertions, 0 deletions
diff --git a/setuptools/_distutils/tests/test_log.py b/setuptools/_distutils/tests/test_log.py
new file mode 100644
index 00000000..75cf9006
--- /dev/null
+++ b/setuptools/_distutils/tests/test_log.py
@@ -0,0 +1,46 @@
+"""Tests for distutils.log"""
+
+import io
+import sys
+import unittest
+from test.support import swap_attr, run_unittest
+
+from distutils import log
+
+class TestLog(unittest.TestCase):
+    def test_non_ascii(self):
+        # Issues #8663, #34421: test that non-encodable text is escaped with
+        # backslashreplace error handler and encodable non-ASCII text is
+        # output as is.
+        for errors in ('strict', 'backslashreplace', 'surrogateescape',
+                       'replace', 'ignore'):
+            with self.subTest(errors=errors):
+                stdout = io.TextIOWrapper(io.BytesIO(),
+                                          encoding='cp437', errors=errors)
+                stderr = io.TextIOWrapper(io.BytesIO(),
+                                          encoding='cp437', errors=errors)
+                old_threshold = log.set_threshold(log.DEBUG)
+                try:
+                    with swap_attr(sys, 'stdout', stdout), \
+                         swap_attr(sys, 'stderr', stderr):
+                        log.debug('Dεbug\tMėssãge')
+                        log.fatal('Fαtal\tÈrrōr')
+                finally:
+                    log.set_threshold(old_threshold)
+
+                stdout.seek(0)
+                self.assertEqual(stdout.read().rstrip(),
+                        'Dεbug\tM?ss?ge' if errors == 'replace' else
+                        'Dεbug\tMssge' if errors == 'ignore' else
+                        'Dεbug\tM\\u0117ss\\xe3ge')
+                stderr.seek(0)
+                self.assertEqual(stderr.read().rstrip(),
+                        'Fαtal\t?rr?r' if errors == 'replace' else
+                        'Fαtal\trrr' if errors == 'ignore' else
+                        'Fαtal\t\\xc8rr\\u014dr')
+
+def test_suite():
+    return unittest.makeSuite(TestLog)
+
+if __name__ == "__main__":
+    run_unittest(test_suite())