Convert fan tests to pytest style (#41631)

tests/components/fan/test_init.py

@@ -1,7 +1,5 @@
 """Tests for fan platforms."""
 
-import unittest
-
 import pytest
 
 from homeassistant.components.fan import FanEntity
@@ -12,32 +10,20 @@ class BaseFan(FanEntity):
 
     def __init__(self):
         """Initialize the fan."""
-        pass
 
 
-class TestFanEntity(unittest.TestCase):
-    """Test coverage for base fan entity class."""
-
-    def setUp(self):
-        """Set up test data."""
-        self.fan = BaseFan()
-        self.addCleanup(self.tear_down_cleanup)
-
-    def tear_down_cleanup(self):
-        """Tear down unit test data."""
-        self.fan = None
-
-    def test_fanentity(self):
-        """Test fan entity methods."""
-        assert self.fan.state == "off"
-        assert len(self.fan.speed_list) == 0
-        assert self.fan.supported_features == 0
-        assert self.fan.capability_attributes == {}
-        # Test set_speed not required
-        self.fan.oscillate(True)
-        with pytest.raises(NotImplementedError):
-            self.fan.set_speed("slow")
-        with pytest.raises(NotImplementedError):
-            self.fan.turn_on()
-        with pytest.raises(NotImplementedError):
-            self.fan.turn_off()
+def test_fanentity():
+    """Test fan entity methods."""
+    fan = BaseFan()
+    assert fan.state == "off"
+    assert len(fan.speed_list) == 0
+    assert fan.supported_features == 0
+    assert fan.capability_attributes == {}
+    # Test set_speed not required
+    fan.oscillate(True)
+    with pytest.raises(NotImplementedError):
+        fan.set_speed("slow")
+    with pytest.raises(NotImplementedError):
+        fan.turn_on()
+    with pytest.raises(NotImplementedError):
+        fan.turn_off()