htaccess RewriteRule rewrite to subfolder - apache

Question

I am trying to rewrite the url 'test' to a subdirectory in /public. This is a Laravel App end I want to run the content in public/test independend of Laravel so I should be prevented to go through the Laravel router.
/test/whatever should be invisbly forwarded to /public/test/whatever (The url should stay /test/whatever).
I now have this:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/test/ [NC]
RewriteRule ^(.*)$ public/test/$1 [L]
RewriteRule ^(.*)$ public/$1 [L]
</IfModule>
So far this is forwarding to: /public/test/test/(index.php)
I think I am close...
Update:
In the public directory is also a .htaccess file (Original, from Laravel 5.4):
<IfModule mod_rewrite.c>
<IfModule mod_negotiation.c>
Options -MultiViews
</IfModule>
RewriteEngine On
# Redirect Trailing Slashes If Not A Folder...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/$ /$1 [L,R=301]
# Handle Front Controller...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]
# Handle Authorization Header
RewriteCond %{HTTP:Authorization} .
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
</IfModule>

Answer 1

You only need the last rule
RewriteRule ^(.*)$ public/$1 [L]
for the root dir .htaccess file. This will rewrite everything to the public/.htaccess, including requests starting with /test.
As long as public/test/ is a directory, and any requested URLs starting with /test/ are real files inside public/test, this will be sufficient, because the conditions
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
will prevent existing files and directories to be handled by index.php.
If test is not an existing directory, or the requests for /test/... are not real files, you need additional rules. Possibly in /public/.htaccess or in /public/test/.htaccess.
The reason for /test being rewritten to /public/test/test was the combination of
# /.htaccess
RewriteRule ^(.*)$ public/test/$1 [L]
where (.*) already includes test, which becomes public/test/test, and then
# /public/.htaccess
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]
because public/test/test is not an existing file or directory (-> RewriteCond), and is therefore handled by this rule.