Issue #15296: Fix minidom.toxml/toprettyxml for non-unicode encodings. Patch by Serhiy Storchaka, with some minor style adjustments by me.
diff --git a/Lib/test/test_minidom.py b/Lib/test/test_minidom.py
index cc4c95b..0427ba3 100644
--- a/Lib/test/test_minidom.py
+++ b/Lib/test/test_minidom.py
@@ -1067,6 +1067,11 @@
b'<?xml version="1.0" encoding="utf-8"?><foo>\xe2\x82\xac</foo>')
self.assertEqual(doc.toxml('iso-8859-15'),
b'<?xml version="1.0" encoding="iso-8859-15"?><foo>\xa4</foo>')
+ self.assertEqual(doc.toxml('us-ascii'),
+ b'<?xml version="1.0" encoding="us-ascii"?><foo>€</foo>')
+ self.assertEqual(doc.toxml('utf-16'),
+ '<?xml version="1.0" encoding="utf-16"?>'
+ '<foo>\u20ac</foo>'.encode('utf-16'))
# Verify that character decoding errors throw exceptions instead
# of crashing