Use simple assertions and pytest runner for test_markerlib.

setuptools/tests/test_markerlib.py

 import os
-import unittest
 
 import pytest
 
 
-class TestMarkerlib(unittest.TestCase):
+class TestMarkerlib:
 
     @pytest.mark.importorskip('ast')
     def test_markers(self):
@@ -12,32 +11,32 @@ class TestMarkerlib(unittest.TestCase):
 
         os_name = os.name
 
-        self.assertTrue(interpret(""))
-
-        self.assertTrue(interpret("os.name != 'buuuu'"))
-        self.assertTrue(interpret("os_name != 'buuuu'"))
-        self.assertTrue(interpret("python_version > '1.0'"))
-        self.assertTrue(interpret("python_version < '5.0'"))
-        self.assertTrue(interpret("python_version <= '5.0'"))
-        self.assertTrue(interpret("python_version >= '1.0'"))
-        self.assertTrue(interpret("'%s' in os.name" % os_name))
-        self.assertTrue(interpret("'%s' in os_name" % os_name))
-        self.assertTrue(interpret("'buuuu' not in os.name"))
-
-        self.assertFalse(interpret("os.name == 'buuuu'"))
-        self.assertFalse(interpret("os_name == 'buuuu'"))
-        self.assertFalse(interpret("python_version < '1.0'"))
-        self.assertFalse(interpret("python_version > '5.0'"))
-        self.assertFalse(interpret("python_version >= '5.0'"))
-        self.assertFalse(interpret("python_version <= '1.0'"))
-        self.assertFalse(interpret("'%s' not in os.name" % os_name))
-        self.assertFalse(interpret("'buuuu' in os.name and python_version >= '5.0'"))
-        self.assertFalse(interpret("'buuuu' in os_name and python_version >= '5.0'"))
+        assert interpret("")
+
+        assert interpret("os.name != 'buuuu'")
+        assert interpret("os_name != 'buuuu'")
+        assert interpret("python_version > '1.0'")
+        assert interpret("python_version < '5.0'")
+        assert interpret("python_version <= '5.0'")
+        assert interpret("python_version >= '1.0'")
+        assert interpret("'%s' in os.name" % os_name)
+        assert interpret("'%s' in os_name" % os_name)
+        assert interpret("'buuuu' not in os.name")
+
+        assert not interpret("os.name == 'buuuu'")
+        assert not interpret("os_name == 'buuuu'")
+        assert not interpret("python_version < '1.0'")
+        assert not interpret("python_version > '5.0'")
+        assert not interpret("python_version >= '5.0'")
+        assert not interpret("python_version <= '1.0'")
+        assert not interpret("'%s' not in os.name" % os_name)
+        assert not interpret("'buuuu' in os.name and python_version >= '5.0'")
+        assert not interpret("'buuuu' in os_name and python_version >= '5.0'")
 
         environment = default_environment()
         environment['extra'] = 'test'
-        self.assertTrue(interpret("extra == 'test'", environment))
-        self.assertFalse(interpret("extra == 'doc'", environment))
+        assert interpret("extra == 'test'", environment)
+        assert not interpret("extra == 'doc'", environment)
 
         def raises_nameError():
             try:
@@ -60,5 +59,5 @@ class TestMarkerlib(unittest.TestCase):
         raises_syntaxError()
 
         statement = "python_version == '5'"
-        self.assertEqual(compile(statement).__doc__, statement)
+        assert compile(statement).__doc__ == statement