initial conversion of exit codes to enum

testing/test_runner.py

@@ -653,7 +653,7 @@ def test_pytest_fail_notrace_non_ascii(testdir):
 def test_pytest_no_tests_collected_exit_status(testdir):
     result = testdir.runpytest()
     result.stdout.fnmatch_lines(["*collected 0 items*"])
-    assert result.ret == main.EXIT_NOTESTSCOLLECTED
+    assert result.ret == main.ExitCode.NO_TESTS_COLLECTED
 
     testdir.makepyfile(
         test_foo="""
@@ -664,12 +664,12 @@ def test_pytest_no_tests_collected_exit_status(testdir):
     result = testdir.runpytest()
     result.stdout.fnmatch_lines(["*collected 1 item*"])
     result.stdout.fnmatch_lines(["*1 passed*"])
-    assert result.ret == main.EXIT_OK
+    assert result.ret == main.ExitCode.OK
 
     result = testdir.runpytest("-k nonmatch")
     result.stdout.fnmatch_lines(["*collected 1 item*"])
     result.stdout.fnmatch_lines(["*1 deselected*"])
-    assert result.ret == main.EXIT_NOTESTSCOLLECTED
+    assert result.ret == main.ExitCode.NO_TESTS_COLLECTED
 
 
 def test_exception_printing_skip():