flysystem-dropbox | Dropbox Adapter for the flysystem | Cloud Storage library

I was facing an issue to install laravel in my ubuntu. Please help me.

I recently discovered a vulnerability in a package that I like to use in my Laravel projects. The package is a log viewer for Laravel: https://github.com/ARCANEDEV/LogViewer.

I put in an issue about the vulnerability and the owner said I can put in a Pull Request to try and rectify the issue, and I feel I could at least try.

My question is: is there a way to use the version of the package with my Pull Request in a testing environment, as if I were installing it via Composer?

Essentially, away from actual unit tests, is there a way to test run a package in a project?

Updates given research and available answers

After much Googling and reading of answers I tried the following:

• Fork the repo I'm looking to make a pull request for. The fork is here: https://github.com/blorange2/LogViewer
• Clone this forked repo onto my local machine and switch to the branch that's compatible with my current version of Laravel (which is v4.5 for Laravel 5.6)
• Update the composer.json in my local project to have a repositories array

I'm using this package (https://github.com/spatie/flysystem-dropbox) to storage and get images from Dropbox.

This works fine but images have to load everytime the page is refreshed. I wonder if you know any image cache solution that works in this case and if can please provide with a minimal working example.

Thanks.

Reference:
FatalErrorException in Inflector.php line 265: syntax error, unexpected ':', expecting ';' or '{'

I have Laravel 5.3.31 installed along with PHP 5.6.32, however, it seems that composer cannot install the correct version of Doctrine and Symfony as I continue to get the error referenced above even after removing the vendor directory and composer.lock file and running composer install.

I have even modified the composer.json file as shown below.

I can't figure out where I'm going wrong, with this. I've followed the Laravel docs by installing spatie/flysystem-dropbox via composer copied the DropboxServiceProvider from the Laravel Docs, added the service provided to the config\app.php, ran composer dump autoload but yet I am still getting the following error message: