Mirror test layout, domcontentloaded waits, backup DB writes outside threads

tests/unit/net_guard.py

@@ -0,0 +1,12 @@
+# retoor <retoor@molodetz.nl>
+import asyncio
+
+import pytest
+
+from molodetz.net_guard import UnsafeURL, guard_public_url
+
+
+@pytest.mark.parametrize("url", ["http://127.0.0.1/", "http://localhost:8088/", "http://10.0.0.1/", "http://169.254.169.254/", "file:///etc/passwd", "ftp://example.com/"])
+def test_private_and_odd_urls_are_refused(url):
+    with pytest.raises(UnsafeURL):
+        asyncio.run(guard_public_url(url))