Add closest template helper

tests/helpers/test_location.py

@@ -0,0 +1,53 @@
+"""Tests Home Assistant location helpers."""
+# pylint: disable=too-many-public-methods
+import unittest
+
+from homeassistant.const import ATTR_LATITUDE, ATTR_LONGITUDE
+from homeassistant.core import State
+from homeassistant.helpers import location
+
+
+class TestHelpersLocation(unittest.TestCase):
+    def test_has_location_with_invalid_states(self):
+        for state in (None, 1, "hello", object):
+            self.assertFalse(location.has_location(state))
+
+    def test_has_location_with_states_with_invalid_locations(self):
+        state = State('hello.world', 'invalid', {
+            ATTR_LATITUDE: 'no number',
+            ATTR_LONGITUDE: 123.12
+        })
+        self.assertFalse(location.has_location(state))
+
+    def test_has_location_with_states_with_valid_location(self):
+        state = State('hello.world', 'invalid', {
+            ATTR_LATITUDE: 123.12,
+            ATTR_LONGITUDE: 123.12
+        })
+        self.assertTrue(location.has_location(state))
+
+    def test_closest_with_no_states_with_location(self):
+        state = State('light.test', 'on')
+        state2 = State('light.test', 'on', {
+            ATTR_LATITUDE: 'invalid',
+            ATTR_LONGITUDE: 123.45,
+        })
+        state3 = State('light.test', 'on', {
+            ATTR_LONGITUDE: 123.45,
+        })
+
+        self.assertIsNone(
+            location.closest(123.45, 123.45, [state, state2, state3]))
+
+    def test_closest_returns_closest(self):
+        state = State('light.test', 'on', {
+            ATTR_LATITUDE: 124.45,
+            ATTR_LONGITUDE: 124.45,
+        })
+        state2 = State('light.test', 'on', {
+            ATTR_LATITUDE: 125.45,
+            ATTR_LONGITUDE: 125.45,
+        })
+
+        self.assertEqual(
+            state, location.closest(123.45, 123.45, [state, state2]))