SF #989185: Drop unicode.iswide() and unicode.width() and add
unicodedata.east_asian_width().  You can still implement your own
simple width() function using it like this:
    def width(u):
        w = 0
        for c in unicodedata.normalize('NFC', u):
            cwidth = unicodedata.east_asian_width(c)
            if cwidth in ('W', 'F'): w += 2
            else: w += 1
        return w
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 17c82ab..215c968 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -11,8 +11,7 @@
 
 class UnicodeTest(
     string_tests.CommonTest,
-    string_tests.MixinStrUnicodeUserStringTest,
-    string_tests.MixinUnicodeUserStringTest
+    string_tests.MixinStrUnicodeUserStringTest
     ):
     type2test = unicode