Add first pass at Z-Wave light tests (#6483)

* Add first pass at Z-Wave light tests

* Remove unused SIGNAL_VALUE

* Lint

* Update test_init.py

tests/components/light/test_zwave.py

@@ -0,0 +1,62 @@
+"""Test Z-Wave lights."""
+from homeassistant.components.zwave import const
+from homeassistant.components.light import zwave, ATTR_BRIGHTNESS
+
+from tests.mock.zwave import MockNode, MockValue, value_changed
+
+
+def test_get_device_detects_dimmer(mock_openzwave):
+    """Test get_device returns a color light."""
+    node = MockNode()
+    value = MockValue(data=0, node=node)
+
+    device = zwave.get_device(node, value, {})
+    assert isinstance(device, zwave.ZwaveDimmer)
+
+
+def test_get_device_detects_colorlight(mock_openzwave):
+    """Test get_device returns a color light."""
+    node = MockNode(command_classes=[const.COMMAND_CLASS_SWITCH_COLOR])
+    value = MockValue(data=0, node=node)
+
+    device = zwave.get_device(node, value, {})
+    assert isinstance(device, zwave.ZwaveColorLight)
+
+
+def test_dimmer_turn_on(mock_openzwave):
+    """Test turning on a dimmable Z-Wave light."""
+    node = MockNode()
+    value = MockValue(data=0, node=node)
+    device = zwave.get_device(node, value, {})
+
+    device.turn_on()
+
+    assert node.set_dimmer.called
+    value_id, brightness = node.set_dimmer.mock_calls[0][1]
+    assert value_id == value.value_id
+    assert brightness == 255
+
+    node.reset_mock()
+
+    device.turn_on(**{ATTR_BRIGHTNESS: 120})
+
+    assert node.set_dimmer.called
+    value_id, brightness = node.set_dimmer.mock_calls[0][1]
+
+    assert value_id == value.value_id
+    assert brightness == 46  # int(120 / 255 * 99)
+
+
+def test_dimmer_value_changed(mock_openzwave):
+    """Test value changed for dimmer lights."""
+    node = MockNode()
+    value = MockValue(data=0, node=node)
+    device = zwave.get_device(node, value, {})
+
+    assert not device.is_on
+
+    value.data = 46
+    value_changed(value)
+
+    assert device.is_on
+    assert device.brightness == 118