Issue #18037: 2to3 now escapes '\u' and '\U' in native strings.

1 files changed, 37 insertions, 0 deletions

diff --git a/Lib/lib2to3/tests/test_fixers.py b/Lib/lib2to3/tests/test_fixers.py
index 2d20b08..bffb741 100644
--- a/Lib/lib2to3/tests/test_fixers.py
+++ b/Lib/lib2to3/tests/test_fixers.py
@@ -2824,6 +2824,43 @@ class Test_unicode(FixerTestCase):
         a = """R'''x''' """
         self.check(b, a)
 
+    def test_native_literal_escape_u(self):
+        b = r"""'\\\u20ac\U0001d121\\u20ac'"""
+        a = r"""'\\\\u20ac\\U0001d121\\u20ac'"""
+        self.check(b, a)
+
+        b = r"""r'\\\u20ac\U0001d121\\u20ac'"""
+        a = r"""r'\\\\u20ac\\U0001d121\\u20ac'"""
+        self.check(b, a)
+
+    def test_bytes_literal_escape_u(self):
+        b = r"""b'\\\u20ac\U0001d121\\u20ac'"""
+        a = r"""b'\\\u20ac\U0001d121\\u20ac'"""
+        self.check(b, a)
+
+        b = r"""br'\\\u20ac\U0001d121\\u20ac'"""
+        a = r"""br'\\\u20ac\U0001d121\\u20ac'"""
+        self.check(b, a)
+
+    def test_unicode_literal_escape_u(self):
+        b = r"""u'\\\u20ac\U0001d121\\u20ac'"""
+        a = r"""'\\\u20ac\U0001d121\\u20ac'"""
+        self.check(b, a)
+
+        b = r"""ur'\\\u20ac\U0001d121\\u20ac'"""
+        a = r"""r'\\\u20ac\U0001d121\\u20ac'"""
+        self.check(b, a)
+
+    def test_native_unicode_literal_escape_u(self):
+        f = 'from __future__ import unicode_literals\n'
+        b = f + r"""'\\\u20ac\U0001d121\\u20ac'"""
+        a = f + r"""'\\\u20ac\U0001d121\\u20ac'"""
+        self.check(b, a)
+
+        b = f + r"""r'\\\u20ac\U0001d121\\u20ac'"""
+        a = f + r"""r'\\\u20ac\U0001d121\\u20ac'"""
+        self.check(b, a)
+
 class Test_callable(FixerTestCase):
     fixer = "callable"