Adds SigFox sensor (#13731)

* Create sigfox.py

* Create test_sigfox.py

* Update .coveragerc

* Fix lints

* Fix logger message string

* More lints

* Address reviewer comments

* edit exception handling

* Update sigfox.py

* Update sigfox.py

* Update sigfox.py

* Update sigfox.py

tests/components/sensor/test_sigfox.py

@@ -0,0 +1,68 @@
+"""Tests for the sigfox sensor."""
+import re
+import requests_mock
+import unittest
+
+from homeassistant.components.sensor.sigfox import (
+    API_URL, CONF_API_LOGIN, CONF_API_PASSWORD)
+from homeassistant.setup import setup_component
+from tests.common import get_test_home_assistant
+
+TEST_API_LOGIN = 'foo'
+TEST_API_PASSWORD = 'ebcd1234'
+
+VALID_CONFIG = {
+    'sensor': {
+        'platform': 'sigfox',
+        CONF_API_LOGIN: TEST_API_LOGIN,
+        CONF_API_PASSWORD: TEST_API_PASSWORD}}
+
+VALID_MESSAGE = """
+{"data":[{
+"time":1521879720,
+"data":"7061796c6f6164",
+"rinfos":[{"lat":"0.0","lng":"0.0"}],
+"snr":"50.0"}]}
+"""
+
+
+class TestSigfoxSensor(unittest.TestCase):
+    """Test the sigfox platform."""
+
+    def setUp(self):
+        """Initialize values for this testcase class."""
+        self.hass = get_test_home_assistant()
+
+    def tearDown(self):
+        """Stop everything that was started."""
+        self.hass.stop()
+
+    def test_invalid_credentials(self):
+        """Test for a invalid credentials."""
+        with requests_mock.Mocker() as mock_req:
+            url = re.compile(API_URL + 'devicetypes')
+            mock_req.get(url, text='{}', status_code=401)
+            self.assertTrue(
+                setup_component(self.hass, 'sensor', VALID_CONFIG))
+        assert len(self.hass.states.entity_ids()) == 0
+
+    def test_valid_credentials(self):
+        """Test for a valid credentials."""
+        with requests_mock.Mocker() as mock_req:
+            url1 = re.compile(API_URL + 'devicetypes')
+            mock_req.get(url1, text='{"data":[{"id":"fake_type"}]}',
+                         status_code=200)
+
+            url2 = re.compile(API_URL + 'devicetypes/fake_type/devices')
+            mock_req.get(url2, text='{"data":[{"id":"fake_id"}]}')
+
+            url3 = re.compile(API_URL + 'devices/fake_id/messages*')
+            mock_req.get(url3, text=VALID_MESSAGE)
+
+            self.assertTrue(
+                setup_component(self.hass, 'sensor', VALID_CONFIG))
+
+            assert len(self.hass.states.entity_ids()) == 1
+            state = self.hass.states.get('sensor.sigfox_fake_id')
+            assert state.state == 'payload'
+            assert state.attributes.get('snr') == '50.0'