Refactory aiohttp clientsession handling in HA (#4602)

* Refactory aiohttp clientsession handling in HA

* remove from core / update platforms / rename file

tests/helpers/test_aiohttp_client.py

@@ -0,0 +1,81 @@
+"""Test the aiohttp client helper."""
+import unittest
+
+import aiohttp
+
+import homeassistant.helpers.aiohttp_client as client
+from homeassistant.util.async import run_callback_threadsafe
+
+from tests.common import get_test_home_assistant
+
+
+class TestHelpersAiohttpClient(unittest.TestCase):
+    """Test homeassistant.helpers.aiohttp_client module."""
+
+    def setup_method(self, method):
+        """Setup things to be run when tests are started."""
+        self.hass = get_test_home_assistant()
+
+    def teardown_method(self, method):
+        """Stop everything that was started."""
+        self.hass.stop()
+
+    def test_get_clientsession_with_ssl(self):
+        """Test init clientsession with ssl."""
+        run_callback_threadsafe(self.hass.loop, client.async_get_clientsession,
+                                self.hass).result()
+
+        assert isinstance(
+            self.hass.data[client.DATA_CLIENTSESSION], aiohttp.ClientSession)
+        assert isinstance(
+            self.hass.data[client.DATA_CONNECTOR], aiohttp.TCPConnector)
+
+    def test_get_clientsession_without_ssl(self):
+        """Test init clientsession without ssl."""
+        run_callback_threadsafe(self.hass.loop, client.async_get_clientsession,
+                                self.hass, False).result()
+
+        assert isinstance(
+            self.hass.data[client.DATA_CLIENTSESSION_NOTVERIFY],
+            aiohttp.ClientSession)
+        assert isinstance(
+            self.hass.data[client.DATA_CONNECTOR_NOTVERIFY],
+            aiohttp.TCPConnector)
+
+    def test_create_clientsession_with_ssl_and_cookies(self):
+        """Test create clientsession with ssl."""
+        def _async_helper():
+            return client.async_create_clientsession(
+                self.hass,
+                cookies={'bla': True}
+            )
+
+        session = run_callback_threadsafe(
+            self.hass.loop,
+            _async_helper,
+        ).result()
+
+        assert isinstance(
+            session, aiohttp.ClientSession)
+        assert isinstance(
+            self.hass.data[client.DATA_CONNECTOR], aiohttp.TCPConnector)
+
+    def test_create_clientsession_without_ssl_and_cookies(self):
+        """Test create clientsession without ssl."""
+        def _async_helper():
+            return client.async_create_clientsession(
+                self.hass,
+                False,
+                cookies={'bla': True}
+            )
+
+        session = run_callback_threadsafe(
+            self.hass.loop,
+            _async_helper,
+        ).result()
+
+        assert isinstance(
+            session, aiohttp.ClientSession)
+        assert isinstance(
+            self.hass.data[client.DATA_CONNECTOR_NOTVERIFY],
+            aiohttp.TCPConnector)