diff --git a/tests/components/weather/test_yweather.py b/tests/components/weather/test_yweather.py
new file mode 100644
index 00000000000..1d4dfea6f43
--- /dev/null
+++ b/tests/components/weather/test_yweather.py
@@ -0,0 +1,186 @@
+"""The tests for the Yahoo weather component."""
+import json
+
+import unittest
+import requests_mock
+from unittest.mock import patch, MagicMock
+
+#from homeassistant.components import weather
+from homeassistant.components.weather import yweather
+from homeassistant.components.weather import (
+    ATTR_WEATHER_ATTRIBUTION, ATTR_WEATHER_HUMIDITY, ATTR_WEATHER_OZONE,
+    ATTR_WEATHER_PRESSURE, ATTR_WEATHER_TEMPERATURE, ATTR_WEATHER_WIND_BEARING,
+    ATTR_WEATHER_WIND_SPEED, ATTR_FORECAST, ATTR_FORECAST_TEMP)
+from homeassistant.util.unit_system import METRIC_SYSTEM
+from homeassistant.setup import setup_component
+
+from tests.common import get_test_home_assistant, load_fixture
+
+
+def mock_responses(mock):
+    """Mock responses for Yahoo Weather."""
+    base_url = 'https://query.yahooapis.com/v1/public/yql'
+    mock.get(base_url +
+             '?q=SELECT+woeid+FROM+geo.places+WHERE+text+%3D+%27%2832.87336'+
+             '%2C-117.22743%29%27&format=json',
+             text=load_fixture('yahooweather.json'))
+
+def _yql_queryMock(yql):
+    """Mock yahoo query language query."""
+    return ('{"query": {"count": 1, "created": "2017-11-17T13:40:47Z", '
+            '"lang": "en-US", "results": {"place": {"woeid": "23511632"}}}}')
+
+def get_woeidMock(lat, lon):
+    """Mock get woeid Where On Earth Identifiers."""
+    return '23511632'
+
+class YahooWeatherMock():
+    """Mock class for the YahooWeather object."""
+
+    def __init__(self, woeid, temp_unit):
+        """Initialize Telnet object."""
+        self.woeid = woeid
+        self.temp_unit = temp_unit
+        self._data = json.loads(load_fixture('yahooweather.json'))
+
+    def updateWeather(self):
+        """Return sample values."""
+        return True
+
+    @property
+    def RawData(self):
+        """Raw Data."""
+        if self.woeid == '12345':
+            return json.loads('[]')
+        return self._data
+
+    @property
+    def Now(self):
+        """Current weather data."""
+        if self.woeid == '111':
+            raise ValueError
+            return None
+        return self._data['query']['results']['channel']['item']['condition']
+
+    @property
+    def Atmosphere(self):
+        """Atmosphere weather data."""
+        return self._data['query']['results']['channel']['atmosphere']
+
+    @property
+    def Wind(self):
+        """Wind weather data."""
+        return self._data['query']['results']['channel']['wind']
+
+    @property
+    def Forecast(self):
+        """Forecast data 0-5 Days."""
+        if self.woeid == '123123':
+            raise ValueError
+        else:
+            return self._data['query']['results']['channel']['item']['forecast']
+        return None
+
+
+class TestWeather(unittest.TestCase):
+    """Test the Yahoo weather component."""
+
+    DEVICES = []
+
+    @requests_mock.Mocker()
+    def add_devices(self, devices, mock):
+        """Mock add devices."""
+        mock_responses(mock)
+        for device in devices:
+            device.update()
+            self.DEVICES.append(device)
+
+    def setUp(self):
+        """Setup things to be run when tests are started."""
+        self.hass = get_test_home_assistant()
+        self.hass.config.units = METRIC_SYSTEM
+
+    def tearDown(self):
+        """Stop down everything that was started."""
+        self.hass.stop()
+
+    @patch('yahooweather._yql_query', new=_yql_queryMock)
+    @patch('yahooweather.get_woeid', new=get_woeidMock)
+    @patch('yahooweather.YahooWeather', new=YahooWeatherMock)
+    @requests_mock.Mocker()
+    def test_setup(self, mock):
+        """Test for typical weather data attributes."""
+        mock_responses(mock)
+        self.assertTrue(
+            setup_component(self.hass, 'weather', {
+                'weather': {
+                    'platform': 'yweather',
+                    }
+                }))
+
+        state = self.hass.states.get('weather.yweather')
+        assert state is not None
+
+        assert state.state == 'cloudy'
+
+        data = state.attributes
+        self.assertEqual(data.get(ATTR_WEATHER_TEMPERATURE), 18.0)
+        self.assertEqual(data.get(ATTR_WEATHER_HUMIDITY), 71)
+        self.assertEqual(data.get(ATTR_WEATHER_PRESSURE), 34100.95)
+        self.assertEqual(data.get(ATTR_WEATHER_WIND_SPEED), 6.44)
+        self.assertEqual(data.get(ATTR_WEATHER_WIND_BEARING), 0)
+        self.assertEqual(state.attributes.get('friendly_name'), 'Yweather')
+
+    @patch('yahooweather._yql_query', new=_yql_queryMock)
+    @patch('yahooweather.get_woeid', new=get_woeidMock)
+    @patch('yahooweather.YahooWeather', new=YahooWeatherMock)
+    @requests_mock.Mocker()
+    def test_setup_no_data(self, mock):
+        """Test for note receiving data."""
+        mock_responses(mock)
+        self.assertTrue(
+            setup_component(self.hass, 'weather', {
+                'weather': {
+                    'platform': 'yweather',
+                    'woeid': '12345',
+                    }
+                }))
+
+        state = self.hass.states.get('weather.yweather')
+        assert state is not None
+
+    @patch('yahooweather._yql_query', new=_yql_queryMock)
+    @patch('yahooweather.get_woeid', new=get_woeidMock)
+    @patch('yahooweather.YahooWeather', new=YahooWeatherMock)
+    @requests_mock.Mocker()
+    def test_setup_bad_data(self, mock):
+        """Test for bad forecast data."""
+        mock_responses(mock)
+        self.assertTrue(
+            setup_component(self.hass, 'weather', {
+                'weather': {
+                    'platform': 'yweather',
+                    'woeid': '123123',
+                    }
+                }))
+
+        state = self.hass.states.get('weather.yweather')
+        assert state is None
+
+    @patch('yahooweather._yql_query', new=_yql_queryMock)
+    @patch('yahooweather.get_woeid', new=get_woeidMock)
+    @patch('yahooweather.YahooWeather', new=YahooWeatherMock)
+    @requests_mock.Mocker()
+    def test_setup_condition_error(self, mock):
+        """Test for bad forecast data."""
+        mock_responses(mock)
+        self.assertTrue(
+            setup_component(self.hass, 'weather', {
+                'weather': {
+                    'platform': 'yweather',
+                    'woeid': '111',
+                    }
+                }))
+
+        state = self.hass.states.get('weather.yweather')
+        assert state is None
diff --git a/tests/fixtures/yahooweather.json b/tests/fixtures/yahooweather.json
new file mode 100644
index 00000000000..f29e146873b
--- /dev/null
+++ b/tests/fixtures/yahooweather.json
@@ -0,0 +1,138 @@
+{
+  "query": {
+    "count": 1,
+    "created": "2017-11-17T13:40:47Z",
+    "lang": "en-US",
+    "results": {
+      "channel": {
+        "units": {
+          "distance": "km",
+          "pressure": "mb",
+          "speed": "km/h",
+          "temperature": "C"
+        },
+        "title": "Yahoo! Weather - San Diego, CA, US",
+        "link": "http://us.rd.yahoo.com/dailynews/rss/weather/Country__Country/*https://weather.yahoo.com/country/state/city-23511632/",
+        "description": "Yahoo! Weather for San Diego, CA, US",
+        "language": "en-us",
+        "lastBuildDate": "Fri, 17 Nov 2017 05:40 AM PST",
+        "ttl": "60",
+        "location": {
+          "city": "San Diego",
+          "country": "United States",
+          "region": " CA"
+        },
+        "wind": {
+          "chill": "66",
+          "direction": "0",
+          "speed": "6.44"
+        },
+        "atmosphere": {
+          "humidity": "71",
+          "pressure": "34100.95",
+          "rising": "0",
+          "visibility": "25.91"
+        },
+        "astronomy": {
+          "sunrise": "6:21 am",
+          "sunset": "4:47 pm"
+        },
+        "image": {
+          "title": "Yahoo! Weather",
+          "width": "142",
+          "height": "18",
+          "link": "http://weather.yahoo.com",
+          "url": "http://l.yimg.com/a/i/brand/purplelogo//uh/us/news-wea.gif"
+        },
+        "item": {
+          "title": "Conditions for San Diego, CA, US at 05:00 AM PST",
+          "lat": "32.878101",
+          "long": "-117.23497",
+          "link": "http://us.rd.yahoo.com/dailynews/rss/weather/Country__Country/*https://weather.yahoo.com/country/state/city-23511632/",
+          "pubDate": "Fri, 17 Nov 2017 05:00 AM PST",
+          "condition": {
+            "code": "26",
+            "date": "Fri, 17 Nov 2017 05:00 AM PST",
+            "temp": "18",
+            "text": "Cloudy"
+          },
+          "forecast": [{
+            "code": "28",
+            "date": "17 Nov 2017",
+            "day": "Fri",
+            "high": "23",
+            "low": "16",
+            "text": "Mostly Cloudy"
+          }, {
+            "code": "30",
+            "date": "18 Nov 2017",
+            "day": "Sat",
+            "high": "22",
+            "low": "13",
+            "text": "Partly Cloudy"
+          }, {
+            "code": "30",
+            "date": "19 Nov 2017",
+            "day": "Sun",
+            "high": "22",
+            "low": "12",
+            "text": "Partly Cloudy"
+          }, {
+            "code": "28",
+            "date": "20 Nov 2017",
+            "day": "Mon",
+            "high": "21",
+            "low": "11",
+            "text": "Mostly Cloudy"
+          }, {
+            "code": "28",
+            "date": "21 Nov 2017",
+            "day": "Tue",
+            "high": "24",
+            "low": "14",
+            "text": "Mostly Cloudy"
+          }, {
+            "code": "30",
+            "date": "22 Nov 2017",
+            "day": "Wed",
+            "high": "27",
+            "low": "15",
+            "text": "Partly Cloudy"
+          }, {
+            "code": "34",
+            "date": "23 Nov 2017",
+            "day": "Thu",
+            "high": "27",
+            "low": "15",
+            "text": "Mostly Sunny"
+          }, {
+            "code": "30",
+            "date": "24 Nov 2017",
+            "day": "Fri",
+            "high": "23",
+            "low": "16",
+            "text": "Partly Cloudy"
+          }, {
+            "code": "30",
+            "date": "25 Nov 2017",
+            "day": "Sat",
+            "high": "22",
+            "low": "15",
+            "text": "Partly Cloudy"
+          }, {
+            "code": "28",
+            "date": "26 Nov 2017",
+            "day": "Sun",
+            "high": "24",
+            "low": "13",
+            "text": "Mostly Cloudy"
+          }],
+          "description": "<![CDATA[<img src=\"http://l.yimg.com/a/i/us/we/52/26.gif\"/>\n<BR />\n<b>Current Conditions:</b>\n<BR />Cloudy\n<BR />\n<BR />\n<b>Forecast:</b>\n<BR /> Fri - Mostly Cloudy. High: 23Low: 16\n<BR /> Sat - Partly Cloudy. High: 22Low: 13\n<BR /> Sun - Partly Cloudy. High: 22Low: 12\n<BR /> Mon - Mostly Cloudy. High: 21Low: 11\n<BR /> Tue - Mostly Cloudy. High: 24Low: 14\n<BR />\n<BR />\n<a href=\"http://us.rd.yahoo.com/dailynews/rss/weather/Country__Country/*https://weather.yahoo.com/country/state/city-23511632/\">Full Forecast at Yahoo! Weather</a>\n<BR />\n<BR />\n<BR />\n]]>",
+          "guid": {
+            "isPermaLink": "false"
+          }
+        }
+      }
+    }
+  }
+}