tests: Convert ext test to pytests

tests/test_ext.py

@@ -1,35 +1,41 @@
 from __future__ import absolute_import, unicode_literals
 
-import unittest
+import pytest
 
 from mopidy import config, ext
 
 
-class ExtensionTest(unittest.TestCase):
+@pytest.fixture
+def extension():
+    return ext.Extension()
 
-    def setUp(self):  # noqa: N802
-        self.ext = ext.Extension()
 
-    def test_dist_name_is_none(self):
-        self.assertIsNone(self.ext.dist_name)
+def test_dist_name_is_none(extension):
+    assert extension.dist_name is None
 
-    def test_ext_name_is_none(self):
-        self.assertIsNone(self.ext.ext_name)
 
-    def test_version_is_none(self):
-        self.assertIsNone(self.ext.version)
+def test_ext_name_is_none(extension):
+    assert extension.ext_name is None
 
-    def test_get_default_config_raises_not_implemented(self):
-        with self.assertRaises(NotImplementedError):
-            self.ext.get_default_config()
 
-    def test_get_config_schema_returns_extension_schema(self):
-        schema = self.ext.get_config_schema()
-        self.assertIsInstance(schema['enabled'], config.Boolean)
+def test_version_is_none(extension):
+    assert extension.version is None
 
-    def test_validate_environment_does_nothing_by_default(self):
-        self.assertIsNone(self.ext.validate_environment())
 
-    def test_setup_raises_not_implemented(self):
-        with self.assertRaises(NotImplementedError):
-            self.ext.setup(None)
+def test_get_default_config_raises_not_implemented(extension):
+    with pytest.raises(NotImplementedError):
+        extension.get_default_config()
+
+
+def test_get_config_schema_returns_extension_schema(extension):
+    schema = extension.get_config_schema()
+    assert isinstance(schema['enabled'], config.Boolean)
+
+
+def test_validate_environment_does_nothing_by_default(extension):
+    assert extension.validate_environment() is None
+
+
+def test_setup_raises_not_implemented(extension):
+    with pytest.raises(NotImplementedError):
+        extension.setup(None)