override laravel application class

a override.md

        $app->useEnvironmentPath(realpath(__DIR__));

Application.php

<?php

namespace Artistan\ZeroNullDates\Tests;

use Illuminate\Foundation\Application as IllApplication;

class Application extends IllApplication
{
    /**
     * The custom configuration path defined by the developer.
     *
     * @var string
     */
    protected $configPath;

    /**
     * Get the path to the application configuration files.
     *
     * @param  string  $path Optionally, a path to append to the config path
     * @return string
     */
    public function configPath($path = '')
    {
        return ($this->configPath ?: $this->basePath.DIRECTORY_SEPARATOR.'config').($path ? DIRECTORY_SEPARATOR.$path : $path);
    }

    /**
     * Set the configuration directory.
     *
     * @param  string  $path
     * @return $this
     */
    public function useConfigPath($path)
    {
        $this->configPath = $path;

        $this->instance('path.config', $path);

        return $this;
    }

}

bootstrap.php

<?php

/*
|--------------------------------------------------------------------------
| Create The Application
|--------------------------------------------------------------------------
|
| The first thing we will do is create a new Laravel application instance
| which serves as the "glue" for all the components of Laravel, and is
| the IoC container for the system binding all of the various parts.
|
*/

$app = new \Artistan\ZeroNullDates\Tests\Application(
    realpath(__DIR__.'/')
);

// allow for custom configurations, not in the
// $app->useConfigPath(realpath(__DIR__.'/config/'));

/*
|--------------------------------------------------------------------------
| Bind Important Interfaces
|--------------------------------------------------------------------------
|
| Next, we need to bind some important interfaces into the container so
| we will be able to resolve them when needed. The kernels serve the
| incoming requests to this application from both the web and CLI.
|
*/

$app->singleton(
    Illuminate\Contracts\Http\Kernel::class,
    App\Http\Kernel::class
);

$app->singleton(
    Illuminate\Contracts\Console\Kernel::class,
    App\Console\Kernel::class
);

$app->singleton(
    Illuminate\Contracts\Debug\ExceptionHandler::class,
    App\Exceptions\Handler::class
);

/*
|--------------------------------------------------------------------------
| Return The Application
|--------------------------------------------------------------------------
|
| This script returns the application instance. The instance is given to
| the calling script so we can separate the building of the instances
| from the actual running of the application and sending responses.
|
*/

return $app;