Move imports to top for fido (#29557)

* Move imports to top for fido

* Fix tests for fido by using patch

homeassistant/components/fido/sensor.py

@@ -7,21 +7,23 @@ https://www.fido.ca/pages/#/my-account/wireless
 For more details about this platform, please refer to the documentation at
 https://home-assistant.io/components/sensor.fido/
 """
-import logging
 from datetime import timedelta
+import logging
 
+from pyfido import FidoClient
+from pyfido.client import PyFidoError
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
 from homeassistant.const import (
-    CONF_USERNAME,
-    CONF_PASSWORD,
-    CONF_NAME,
     CONF_MONITORED_VARIABLES,
+    CONF_NAME,
+    CONF_PASSWORD,
+    CONF_USERNAME,
 )
+import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import Throttle
-import homeassistant.helpers.config_validation as cv
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -147,7 +149,6 @@ class FidoData:
 
     def __init__(self, username, password, httpsession):
         """Initialize the data object."""
-        from pyfido import FidoClient
 
         self.client = FidoClient(username, password, REQUESTS_TIMEOUT, httpsession)
         self.data = {}
@@ -155,7 +156,6 @@ class FidoData:
     @Throttle(MIN_TIME_BETWEEN_UPDATES)
     async def async_update(self):
         """Get the latest data from Fido."""
-        from pyfido.client import PyFidoError
 
         try:
             await self.client.fetch_data()

tests/components/fido/test_sensor.py

@@ -2,7 +2,7 @@
 import asyncio
 import logging
 import sys
-from unittest.mock import MagicMock
+from unittest.mock import MagicMock, patch
 
 from homeassistant.bootstrap import async_setup_component
 from homeassistant.components.fido import sensor as fido
@@ -66,29 +66,25 @@ def fake_async_add_entities(component, update_before_add=False):
 @asyncio.coroutine
 def test_fido_sensor(loop, hass):
     """Test the Fido number sensor."""
-    sys.modules["pyfido"] = MagicMock()
-    sys.modules["pyfido.client"] = MagicMock()
-    sys.modules["pyfido.client.PyFidoError"] = PyFidoErrorMock
-    import pyfido.client
-
-    pyfido.FidoClient = FidoClientMock
-    pyfido.client.PyFidoError = PyFidoErrorMock
-    config = {
-        "sensor": {
-            "platform": "fido",
-            "name": "fido",
-            "username": "myusername",
-            "password": "password",
-            "monitored_variables": ["balance", "data_remaining"],
+    with patch(
+        "homeassistant.components.fido.sensor.FidoClient", new=FidoClientMock
+    ), patch("homeassistant.components.fido.sensor.PyFidoError", new=PyFidoErrorMock):
+        config = {
+            "sensor": {
+                "platform": "fido",
+                "name": "fido",
+                "username": "myusername",
+                "password": "password",
+                "monitored_variables": ["balance", "data_remaining"],
+            }
         }
-    }
-    with assert_setup_component(1):
-        yield from async_setup_component(hass, "sensor", config)
-    state = hass.states.get("sensor.fido_1112223344_balance")
-    assert state.state == "160.12"
-    assert state.attributes.get("number") == "1112223344"
-    state = hass.states.get("sensor.fido_1112223344_data_remaining")
-    assert state.state == "100.33"
+        with assert_setup_component(1):
+            yield from async_setup_component(hass, "sensor", config)
+        state = hass.states.get("sensor.fido_1112223344_balance")
+        assert state.state == "160.12"
+        assert state.attributes.get("number") == "1112223344"
+        state = hass.states.get("sensor.fido_1112223344_data_remaining")
+        assert state.state == "100.33"
 
 
 @asyncio.coroutine