py3: add b'' prefixes in tests/test-linerange.py

py3: add b'' prefixes in tests/test-linerange.py

This makes the test pass on Python 3.

# skip-blame because just b'' prefixes

Differential Revision: https://phab.mercurial-scm.org/D3282

--- a/tests/test-linerange.py	Thu Apr 12 15:23:36 2018 +0530
+++ b/tests/test-linerange.py	Thu Apr 12 16:52:32 2018 +0530
@@ -4,7 +4,7 @@
 from mercurial import error, mdiff
 
 # for readability, line numbers are 0-origin
-text1 = '''
+text1 = b'''
            00 at OLD
            01 at OLD
            02 at OLD
@@ -19,7 +19,7 @@
            11 at OLD
 '''[1:] # strip initial LF
 
-text2 = '''
+text2 = b'''
 00 at NEW
 01 at NEW
 02 at NEW, 03 at OLD
@@ -47,10 +47,10 @@
     def setUp(self):
         self.blocks = list(mdiff.allblocks(text1, text2))
         assert self.blocks == [
-            ([0, 3, 0, 2], '!'),
-            ((3, 7, 2, 6), '='),
-            ([7, 12, 6, 12], '!'),
-            ((12, 12, 12, 12), '='),
+            ([0, 3, 0, 2], b'!'),
+            ((3, 7, 2, 6), b'='),
+            ([7, 12, 6, 12], b'!'),
+            ((12, 12, 12, 12), b'='),
         ], self.blocks
 
     def testWithinEqual(self):