Apprise notifications (#43)

* issue #4 Adding settings screen for apprise URLS
* Adding test notification mechanism

* Move Worker module to own class file

* Adding basic notification URL runner

* Tests for notifications

* Tweak readme with notification info

* Move notification test to main test_backend.py

* Fix spacing

* Adding notifications screenshot

* Cleanup more files from test

* Offer send notification test on individual edits and main/default

* Process global notifications

* All branches test

* Wrap worker notification process in try/catch, use global if nothing set

* Fix syntax

* Handle exception, increase wait time for liveserver to come up

* Fixing test setup

* remove debug

* Split tests into their own totally isolated setups, if you know a better way to make live_server() work, MR :)

* Tidying up lint/imports

backend/tests/test_notification.py

@@ -0,0 +1,66 @@
+
+import time
+from flask import url_for
+from . util import set_original_response, set_modified_response, live_server_setup
+
+# Hard to just add more live server URLs when one test is already running (I think)
+# So we add our test here (was in a different file)
+def test_check_notification(client, live_server):
+
+    live_server_setup(live_server)
+    set_original_response()
+
+    # Give the endpoint time to spin up
+    time.sleep(3)
+
+    # Add our URL to the import page
+    test_url = url_for('test_endpoint', _external=True)
+    res = client.post(
+        url_for("import_page"),
+        data={"urls": test_url},
+        follow_redirects=True
+    )
+    assert b"1 Imported" in res.data
+
+    # Give the thread time to pick it up
+    time.sleep(3)
+
+    # Goto the edit page, add our ignore text
+    # Add our URL to the import page
+    url = url_for('test_notification_endpoint', _external=True)
+    notification_url = url.replace('http', 'json')
+
+    print (">>>> Notification URL: "+notification_url)
+    res = client.post(
+        url_for("edit_page", uuid="first"),
+        data={"notification_urls": notification_url, "url": test_url, "tag": "", "headers": ""},
+        follow_redirects=True
+    )
+    assert b"Updated watch." in res.data
+
+    # Hit the edit page, be sure that we saved it
+    res = client.get(
+        url_for("edit_page", uuid="first"))
+    assert bytes(notification_url.encode('utf-8')) in res.data
+
+    set_modified_response()
+
+    # Trigger a check
+    client.get(url_for("api_watch_checknow"), follow_redirects=True)
+
+    # Give the thread time to pick it up
+    time.sleep(3)
+
+    # Did the front end see it?
+    res = client.get(
+        url_for("index"))
+    assert bytes("just now".encode('utf-8')) in res.data
+
+
+    # Check it triggered
+    res = client.get(
+        url_for("test_notification_counter"),
+    )
+    print (res.data)
+
+    assert bytes("we hit it".encode('utf-8')) in res.data