Chef Recipe How To Check If File Exists

I just started using Chef and I'm trying to figure out how to first check if a file exists before doing anything.

I have the file part down for my current use case, where I'm removing a login file for the production server, ex:

file '/var/www/html/login.php' do
    action :delete
end

However, I'd like the abilty to first check if the file exists, ex.

if (file_exists === true)
    file '/var/www/html/login.php' do
        action :delete
    end
end