Add fan module (#764)

Co-authored-by: Steven B <51370195+sdb9696@users.noreply.github.com>

kasa/tests/smart/modules/test_fan.py

@@ -0,0 +1,43 @@
+from pytest_mock import MockerFixture
+
+from kasa import SmartDevice
+from kasa.smart.modules import FanModule
+from kasa.tests.device_fixtures import parametrize
+
+fan = parametrize(
+    "has fan", component_filter="fan_control", protocol_filter={"SMART.CHILD"}
+)
+
+
+@fan
+async def test_fan_speed(dev: SmartDevice, mocker: MockerFixture):
+    """Test fan speed feature."""
+    fan: FanModule = dev.modules["FanModule"]
+    level_feature = fan._module_features["fan_speed_level"]
+    assert level_feature.minimum_value <= level_feature.value <= level_feature.maximum_value
+
+    call = mocker.spy(fan, "call")
+    await fan.set_fan_speed_level(3)
+    call.assert_called_with("set_device_info", {"fan_sleep_level": 3})
+
+    await dev.update()
+
+    assert fan.fan_speed_level == 3
+    assert level_feature.value == 3
+
+
+@fan
+async def test_sleep_mode(dev: SmartDevice, mocker: MockerFixture):
+    """Test sleep mode feature."""
+    fan: FanModule = dev.modules["FanModule"]
+    sleep_feature = fan._module_features["fan_sleep_mode"]
+    assert isinstance(sleep_feature.value, bool)
+
+    call = mocker.spy(fan, "call")
+    await fan.set_sleep_mode(True)
+    call.assert_called_with("set_device_info", {"fan_sleep_mode_on": True})
+
+    await dev.update()
+
+    assert fan.sleep_mode is True
+    assert sleep_feature.value is True