Normalize all source encoding declarations

testing/python/collect.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# coding: utf-8
 import os
 import sys
 import textwrap
@@ -119,7 +119,7 @@ class TestModule(object):
         """
         testdir.makepyfile(
             u"""
-            # -*- coding: utf-8 -*-
+            # coding: utf-8
             raise ImportError(u'Something bad happened ☺')
         """
         )
@@ -1244,7 +1244,7 @@ def test_syntax_error_with_non_ascii_chars(testdir):
     """
     testdir.makepyfile(
         u"""
-    # -*- coding: UTF-8 -*-
+    # coding: utf-8
 
     ☃
     """

testing/python/fixtures.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# coding: utf-8
 import sys
 import textwrap
 

testing/python/metafunc.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# coding: utf-8
 import re
 import sys
 import textwrap

testing/python/show_fixtures_per_test.py

@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# coding: utf-8
 
 
 def test_no_items_should_not_show_output(testdir):