Add instructions for testing locally

README.md

@@ -11,6 +11,14 @@ If there are rulesets that are broken and need to be disabled, add them to the `
     npm install
     npm run build
 
+## Testing locally
+
+1. Copy `out/httpse.leveldb.zip` into `~/BraveSoftware/Brave-Browser-Beta/oofiananboodjbbmdelgdommihjbkfag/*/*/` overwriting the existing file.
+2. Delete the `httpse.leveldb` directory.
+3. Unzip `httpse.leveldb.zip`.
+4. Start the browser and ensure that <https://https-everywhere.badssl.com/> works.
+5. Find a site that was added in the last release and check that it gets upgraded. Check it first with `curl --head` to make sure it doesn't redirect to HTTPS server-side.
+
 ## Releasing a new version
 
 1. Connect to the Brave VPN.