test: convert util.selinux test to pytest

No semantic change in the test itself.

test/mod/test_util_selinux.py

@@ -3,40 +3,37 @@
 #
 
 import io
-import unittest
 
 from osbuild.util import selinux
 
 
-class TestObjectStore(unittest.TestCase):
+def test_selinux_config():
+    f = io.StringIO()
+    cfg = selinux.parse_config(f)
+    assert cfg is not None
+    policy = selinux.config_get_policy(cfg)
+    assert policy is None
 
-    def test_selinux_config(self):
-        f = io.StringIO()
-        cfg = selinux.parse_config(f)
-        self.assertIsNotNone(cfg)
-        policy = selinux.config_get_policy(cfg)
-        self.assertIsNone(policy)
+    example_good = """
+    # This file controls the state of SELinux on the system.
+    # SELINUX= can take one of these three values:
+    #     enforcing - SELinux security policy is enforced.
+    #     permissive - SELinux prints warnings instead of enforcing.
+    #     disabled - No SELinux policy is loaded.
+    SELINUX=enforcing
+    # SELINUXTYPE= can take one of these three values:
+    #     targeted - Targeted processes are protected,
+    #     minimum - Modification of targeted policy.
+    #     mls - Multi Level Security protection.
+    SELINUXTYPE=targeted
+    """
 
-        example_good = """
-        # This file controls the state of SELinux on the system.
-        # SELINUX= can take one of these three values:
-        #     enforcing - SELinux security policy is enforced.
-        #     permissive - SELinux prints warnings instead of enforcing.
-        #     disabled - No SELinux policy is loaded.
-        SELINUX=enforcing
-        # SELINUXTYPE= can take one of these three values:
-        #     targeted - Targeted processes are protected,
-        #     minimum - Modification of targeted policy.
-        #     mls - Multi Level Security protection.
-        SELINUXTYPE=targeted
-        """
+    f = io.StringIO(example_good)
+    cfg = selinux.parse_config(f)
+    assert 'SELINUX' in cfg
+    assert 'SELINUXTYPE' in cfg
+    assert cfg['SELINUX'] == 'enforcing'
+    assert cfg['SELINUXTYPE'] == 'targeted'
 
-        f = io.StringIO(example_good)
-        cfg = selinux.parse_config(f)
-        self.assertIn('SELINUX', cfg)
-        self.assertIn('SELINUXTYPE', cfg)
-        self.assertEqual(cfg['SELINUX'], 'enforcing')
-        self.assertEqual(cfg['SELINUXTYPE'], 'targeted')
-
-        policy = selinux.config_get_policy(cfg)
-        self.assertEqual(policy, 'targeted')
+    policy = selinux.config_get_policy(cfg)
+    assert policy == 'targeted'