Remove homeassistant.remote (#16099)

* Remove homeassistant.remote

* Use direct import for API

* Fix docstring

tests/helpers/test_json.py

@@ -0,0 +1,21 @@
+"""Test Home Assistant remote methods and classes."""
+import pytest
+
+from homeassistant import core
+from homeassistant.helpers.json import JSONEncoder
+from homeassistant.util import dt as dt_util
+
+
+def test_json_encoder(hass):
+    """Test the JSON Encoder."""
+    ha_json_enc = JSONEncoder()
+    state = core.State('test.test', 'hello')
+
+    assert ha_json_enc.default(state) == state.as_dict()
+
+    # Default method raises TypeError if non HA object
+    with pytest.raises(TypeError):
+        ha_json_enc.default(1)
+
+    now = dt_util.utcnow()
+    assert ha_json_enc.default(now) == now.isoformat()