Add test when using native strings with non-ascii chars

testing/test_runner.py

@@ -440,16 +440,19 @@ def test_pytest_fail_notrace(testdir):
     assert 'def teardown_function' not in result.stdout.str()
 
 
-def test_pytest_fail_notrace_unicode(testdir):
+@pytest.mark.parametrize('str_prefix', ['u', ''])
+def test_pytest_fail_notrace_non_ascii(testdir, str_prefix):
     """Fix pytest.fail with pytrace=False with non-ascii characters (#1178).
+
+    This tests with native and unicode strings containing non-ascii chars.
     """
     testdir.makepyfile(u"""
         # coding: utf-8
         import pytest
 
         def test_hello():
-            pytest.fail(u'oh oh: ☺', pytrace=False)
-    """)
+            pytest.fail(%s'oh oh: ☺', pytrace=False)
+    """ % str_prefix)
     result = testdir.runpytest()
     if sys.version_info[0] >= 3:
         result.stdout.fnmatch_lines(['*test_hello*', "oh oh: ☺"])