Add check_config API (#5898)

* Add check_config API

* Add config panel to default config

* Add tests

* Lint

* lint

tests/components/config/test_core.py

@@ -0,0 +1,39 @@
+"""Test hassbian config."""
+import asyncio
+from unittest.mock import patch
+
+from homeassistant.bootstrap import async_setup_component
+from homeassistant.components import config
+from homeassistant.components.config.core import CheckConfigView
+from tests.common import mock_http_component_app, mock_coro
+
+
+@asyncio.coroutine
+def test_validate_config_ok(hass, test_client):
+    """Test getting suites."""
+    app = mock_http_component_app(hass)
+    with patch.object(config, 'SECTIONS', ['core']):
+        yield from async_setup_component(hass, 'config', {})
+
+    hass.http.views[CheckConfigView.name].register(app.router)
+    client = yield from test_client(app)
+
+    with patch(
+        'homeassistant.components.config.core.async_check_ha_config_file',
+            return_value=mock_coro(None)()):
+        resp = yield from client.post('/api/config/core/check_config')
+
+    assert resp.status == 200
+    result = yield from resp.json()
+    assert result['result'] == 'valid'
+    assert result['errors'] is None
+
+    with patch(
+        'homeassistant.components.config.core.async_check_ha_config_file',
+            return_value=mock_coro('beer')()):
+        resp = yield from client.post('/api/config/core/check_config')
+
+    assert resp.status == 200
+    result = yield from resp.json()
+    assert result['result'] == 'invalid'
+    assert result['errors'] == 'beer'