Unit tests for the Xiaomi Air Quality Monitor added. (#135)

miio/airqualitymonitor.py

@@ -8,7 +8,7 @@
 class AirQualityMonitorStatus:
     """Container of air quality monitor status."""
     def __init__(self, data):
-        # ['power': 'on', 'aqi': 34, 'battery': 0, 'usb_state': 'on']
+        # {'power': 'on', 'aqi': 34, 'battery': 100, 'usb_state': 'off'}
         self.data = data
 
     @property

miio/tests/test_airqualitymonitor.py

@@ -0,0 +1,58 @@
+from unittest import TestCase
+from miio import AirQualityMonitor
+from .dummies import DummyDevice
+import pytest
+
+
+class DummyAirQualityMonitor(DummyDevice, AirQualityMonitor):
+    def __init__(self, *args, **kwargs):
+        self.state = {
+            'power': 'on',
+            'aqi': 34,
+            'battery': 100,
+            'usb_state': 'off'
+        }
+        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 airqualitymonitor(request):
+    request.cls.device = DummyAirQualityMonitor()
+    # TODO add ability to test on a real device
+
+
+@pytest.mark.usefixtures("airqualitymonitor")
+class TestAirQualityMonitor(TestCase):
+    def is_on(self):
+        return self.device.status().is_on
+
+    def state(self):
+        return self.device.status()
+
+    def test_on(self):
+        self.device.off()  # ensure off
+
+        start_state = self.is_on()
+        assert start_state is False
+
+        self.device.on()
+        assert self.is_on() is True
+
+    def test_off(self):
+        self.device.on()  # ensure on
+
+        assert self.is_on() is True
+        self.device.off()
+        assert self.is_on() is False
+
+    def test_status(self):
+        self.device._reset_state()
+
+        assert self.is_on() is True
+        assert self.state().aqi == self.device.start_state["aqi"]
+        assert self.state().battery == self.device.start_state["battery"]
+        assert self.state().usb_power == (self.device.start_state["usb_state"] == 'on')