Add DuckDNS component (#9556)

* Add DuckDNS component

* Address comments

tests/components/test_duckdns.py

@@ -0,0 +1,106 @@
+"""Test the DuckDNS component."""
+import asyncio
+from datetime import timedelta
+
+import pytest
+
+from homeassistant.setup import async_setup_component
+from homeassistant.components import duckdns
+from homeassistant.util.dt import utcnow
+
+from tests.common import async_fire_time_changed
+
+DOMAIN = 'bla'
+TOKEN = 'abcdefgh'
+
+
+@pytest.fixture
+def setup_duckdns(hass, aioclient_mock):
+    """Fixture that sets up DuckDNS."""
+    aioclient_mock.get(duckdns.UPDATE_URL, params={
+        'domains': DOMAIN,
+        'token': TOKEN
+    }, text='OK')
+
+    hass.loop.run_until_complete(async_setup_component(
+        hass, duckdns.DOMAIN, {
+            'duckdns': {
+                'domain': DOMAIN,
+                'access_token': TOKEN
+            }
+        }))
+
+
+@asyncio.coroutine
+def test_setup(hass, aioclient_mock):
+    """Test setup works if update passes."""
+    aioclient_mock.get(duckdns.UPDATE_URL, params={
+        'domains': DOMAIN,
+        'token': TOKEN
+    }, text='OK')
+
+    result = yield from async_setup_component(hass, duckdns.DOMAIN, {
+        'duckdns': {
+            'domain': DOMAIN,
+            'access_token': TOKEN
+        }
+    })
+    assert result
+    assert aioclient_mock.call_count == 1
+
+    async_fire_time_changed(hass, utcnow() + timedelta(minutes=5))
+    yield from hass.async_block_till_done()
+    assert aioclient_mock.call_count == 2
+
+
+@asyncio.coroutine
+def test_setup_fails_if_update_fails(hass, aioclient_mock):
+    """Test setup fails if first update fails."""
+    aioclient_mock.get(duckdns.UPDATE_URL, params={
+        'domains': DOMAIN,
+        'token': TOKEN
+    }, text='KO')
+
+    result = yield from async_setup_component(hass, duckdns.DOMAIN, {
+        'duckdns': {
+            'domain': DOMAIN,
+            'access_token': TOKEN
+        }
+    })
+    assert not result
+    assert aioclient_mock.call_count == 1
+
+
+@asyncio.coroutine
+def test_service_set_txt(hass, aioclient_mock, setup_duckdns):
+    """Test set txt service call."""
+    # Empty the fixture mock requests
+    aioclient_mock.clear_requests()
+
+    aioclient_mock.get(duckdns.UPDATE_URL, params={
+        'domains': DOMAIN,
+        'token': TOKEN,
+        'txt': 'some-txt',
+    }, text='OK')
+
+    assert aioclient_mock.call_count == 0
+    yield from hass.components.duckdns.async_set_txt('some-txt')
+    assert aioclient_mock.call_count == 1
+
+
+@asyncio.coroutine
+def test_service_clear_txt(hass, aioclient_mock, setup_duckdns):
+    """Test clear txt service call."""
+    # Empty the fixture mock requests
+    aioclient_mock.clear_requests()
+
+    aioclient_mock.get(duckdns.UPDATE_URL, params={
+        'domains': DOMAIN,
+        'token': TOKEN,
+        'txt': '',
+        'clear': 'true',
+    }, text='OK')
+
+    assert aioclient_mock.call_count == 0
+    yield from hass.components.duckdns.async_set_txt(None)
+    assert aioclient_mock.call_count == 1