Add a base to allow easier testing of devices

To demonstrate its functionality unittests for yeelight and plug
are included in this commit. It also allowed to spot a couple of bugs
in yeelight already..

miio/tests/dummies.py

@@ -0,0 +1,42 @@
+class DummyDevice:
+    """DummyDevice base class, you should inherit from this and call
+    `super().__init__(args, kwargs)` to save the original state.
+
+    This class provides helpers to test simple devices, for more complex
+    ones you will want to extend the `return_values` accordingly.
+    The basic idea is that the overloaded send() will read a wanted response
+    based on the call from `return_values`.
+
+    For changing values :func:`_set_state` will use :func:`pop()` to extract
+     the first parameter and set the state accordingly.
+
+    For a very simple device the following is enough, see :class:`TestPlug`
+     for complete code.
+
+    .. code-block::
+        self.return_values = {
+            "get_prop": self._get_state,
+            "power": lambda x: self._set_state("power", x)
+        }
+
+    """
+    def __init__(self, *args, **kwargs):
+        self.start_state = self.state.copy()
+
+    def send(self, command: str, parameters=None, retry_count=3):
+        """Overridden send() to return values from `self.return_values`."""
+        return self.return_values[command](parameters)
+
+    def _reset_state(self):
+        """Revert back to the original state."""
+        self.state = self.start_state.copy()
+
+    def _set_state(self, var, value):
+        """Set a state of a variable,
+        the value is expected to be an array with length of 1."""
+        # print("setting %s = %s" % (var, value))
+        self.state[var] = value.pop(0)
+
+    def _get_state(self, props):
+        """Return wanted properties"""
+        return [self.state[x] for x in props if x in self.state]

miio/tests/test_plug.py

@@ -0,0 +1,56 @@
+from unittest import TestCase
+from miio import Plug
+from .dummies import DummyDevice
+import pytest
+
+class DummyPlug(DummyDevice, Plug):
+    def __init__(self, *args, **kwargs):
+        self.state = {
+            'power': 'on',
+            'temperature': 32,
+            'current': 123,
+        }
+        self.return_values = {
+            'get_prop': self._get_state,
+            'set_power': lambda x: self._set_state("power", x),
+        }
+        super().__init__(args, kwargs)
+
+@pytest.fixture(scope="class")
+def plug(request):
+    request.cls.device = DummyPlug()
+    # TODO add ability to test on a real device
+
+@pytest.mark.usefixtures("plug")
+
+class TestPlug(TestCase):
+    def test_on(self):
+        self.device.off()  # ensure off
+        is_on = lambda: self.device.status().is_on
+        start_state = is_on()
+        assert start_state == False
+
+        self.device.on()
+        assert is_on() == True
+
+
+    def test_off(self):
+        self.device.on()  # ensure on
+        is_on = lambda: self.device.status().is_on
+        assert is_on() == True
+
+        self.device.off()
+        assert is_on() == False
+
+    def test_status(self):
+        self.device._reset_state()
+        state = lambda: self.device.status()
+        print(state())
+        assert state().is_on == True
+        assert state().temperature == self.device.start_state["temperature"]
+        assert state().load_power ==  self.device.start_state["current"] * 110
+
+    def test_status_without_current(self):
+        del self.device.state["current"]
+        state = lambda: self.device.status()
+        assert state().load_power is None

miio/tests/test_yeelight.py

@@ -0,0 +1,179 @@
+from unittest import TestCase
+from miio import Yeelight
+from miio.yeelight import YeelightMode, YeelightStatus, YeelightException
+import pytest
+from .dummies import DummyDevice
+
+class DummyLight(DummyDevice, Yeelight):
+    def __init__(self, *args, **kwargs):
+        self.state = {
+            'power': 'off',
+            'bright': '100',
+            'ct': '3584',
+            'rgb': '16711680',
+            'hue': '359',
+            'sat': '100',
+            'color_mode': '2',
+            'name': 'test name',
+            'lan_ctrl': '1',
+            'save_state': '1'
+        }
+
+        self.return_values = {
+            'get_prop': self._get_state,
+            'set_power': lambda x: self._set_state("power", x),
+            'set_bright': lambda x: self._set_state("bright", x),
+            'set_ct_abx': lambda x: self._set_state("ct", x),
+            'set_rgb': lambda x: self._set_state("rgb", x),
+            'set_hsv': lambda x: self._set_state("hsv", x),
+            'set_name': lambda x: self._set_state("name", x),
+            'set_ps': lambda x: self.set_config(x),
+            'toggle': self.toggle_power,
+            'set_default': lambda x: 'ok'
+        }
+
+        super().__init__(*args, **kwargs)
+
+    def set_config(self, x):
+        key, value = x
+        config_mapping = {
+            'cfg_lan_ctrl': 'lan_ctrl',
+            'cfg_save_state': 'save_state'
+        }
+
+        self._set_state(config_mapping[key], [value])
+
+    def toggle_power(self, _):
+        if self.state["power"] == "on":
+            self.state["power"] = "off"
+        else:
+            self.state["power"] = "on"
+
+
+@pytest.fixture(scope="class")
+def dummylight(request):
+    request.cls.device = DummyLight()
+    # TODO add ability to test on a real device
+
+@pytest.mark.usefixtures("dummylight")
+class TestYeelight(TestCase):
+    def test_status(self):
+        self.device._reset_state()
+        status = self.device.status()  # type: YeelightStatus
+        assert status.name == self.device.start_state["name"]
+        assert status.is_on == False
+        assert status.brightness == 100
+        assert status.color_temp == 3584
+        assert status.color_mode == YeelightMode.ColorTemperature
+        assert status.developer_mode == True
+        assert status.save_state_on_change == True
+
+        # following are tested in set mode tests
+        # assert status.rgb == 16711680
+        # assert status.hsv == (359, 100, 100)
+
+    def test_on(self):
+        self.device.off() # make sure we are off
+        assert self.device.status().is_on == False
+        self.device.on()
+        assert self.device.status().is_on == True
+
+    def test_off(self):
+        self.device.on() # make sure we are on
+        assert self.device.status().is_on == True
+        self.device.off()
+        assert self.device.status().is_on == False
+
+    def test_set_brightness(self):
+        brightness = lambda: self.device.status().brightness
+
+        self.device.set_brightness(50)
+        assert brightness() == 50
+        self.device.set_brightness(0)
+        assert brightness() == 0
+        self.device.set_brightness(100)
+
+        with pytest.raises(YeelightException):
+            self.device.set_brightness(-100)
+
+        with pytest.raises(YeelightException):
+            self.device.set_brightness(200)
+
+    def test_set_color_temp(self):
+        color_temp = lambda: self.device.status().color_temp
+        self.device.set_color_temp(2000)
+        assert color_temp() == 2000
+        self.device.set_color_temp(6500)
+        assert color_temp() == 6500
+
+        with pytest.raises(YeelightException):
+            self.device.set_color_temp(1000)
+
+        with pytest.raises(YeelightException):
+            self.device.set_color_temp(7000)
+
+    @pytest.mark.skip("rgb is not properly implemented")
+    def test_set_rgb(self):
+        self.device._reset_state()
+        assert self.device.status().rgb == 16711680
+
+        NEW_RGB = 16712222
+        self.set_rgb(NEW_RGB)
+        assert self.device.status().rgb == NEW_RGB
+
+    @pytest.mark.skip("hsv is not properly implemented")
+    def test_set_hsv(self):
+        self.reset_state()
+        hue, sat, val = self.device.status().hsv
+        assert hue == 359
+        assert sat == 100
+        assert val == 100
+
+        self.device.set_hsv()
+
+    def test_set_developer_mode(self):
+        dev_mode = lambda: self.device.status().developer_mode
+
+        orig_mode = dev_mode()
+        self.device.set_developer_mode(not orig_mode)
+        new_mode = dev_mode()
+        assert new_mode is not orig_mode
+        self.device.set_developer_mode(not new_mode)
+        assert new_mode is not dev_mode()
+
+    def test_set_save_state_on_change(self):
+        save_state = lambda: self.device.status().save_state_on_change
+        orig_state = save_state()
+        self.device.set_save_state_on_change(not orig_state)
+        new_state = save_state()
+        assert new_state is not orig_state
+        self.device.set_save_state_on_change(not new_state)
+        new_state = save_state()
+        assert new_state is orig_state
+
+    def test_set_name(self):
+        name = lambda: self.device.status().name
+
+        assert name() == "test name"
+        self.device.set_name("new test name")
+        assert name() == "new test name"
+
+    def test_toggle(self):
+        is_on = lambda: self.device.status().is_on
+
+        orig_state = is_on()
+        self.device.toggle()
+        new_state = is_on()
+        assert orig_state != new_state
+
+        self.device.toggle()
+        new_state = is_on()
+        assert new_state == orig_state
+
+    @pytest.mark.skip("cannot be tested easily")
+    def test_set_default(self):
+        self.fail()
+
+    @pytest.mark.skip("set_scene is not implemented")
+    def test_set_scene(self):
+        self.fail()

miio/yeelight.py

@@ -4,6 +4,10 @@
 import warnings
 
 
+class YeelightException(Exception):
+    pass
+
+
 class YeelightMode(IntEnum):
     RGB = 1
     ColorTemperature = 2
@@ -145,10 +149,14 @@ def off(self):
 
     def set_brightness(self, bright):
         """Set brightness."""
+        if bright < 0 or bright > 100:
+            raise YeelightException("Invalid brightness: %s" % bright)
         return self.send("set_bright", [bright])
 
     def set_color_temp(self, ct):
         """Set color temp in kelvin."""
+        if ct > 6500 or ct < 1700:
+            raise YeelightException("Invalid color temperature: %s" % ct)
         return self.send("set_ct_abx", [ct, "smooth", 500])
 
     def set_rgb(self, rgb):
@@ -165,7 +173,7 @@ def set_developer_mode(self, enable: bool) -> bool:
 
     def set_save_state_on_change(self, enable: bool) -> bool:
         """Enable or disable saving the state on changes."""
-        return self.send("set_ps", ["cfg_save_state"], str(int(enable)))
+        return self.send("set_ps", ["cfg_save_state", str(int(enable))])
 
     def set_name(self, name: str) -> bool:
         """Set an internal name for the bulb."""