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    <h3>Editing: InteractsWithAuthentication.php</h3>
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namespace Illuminate\Foundation\Testing\Concerns;

use Illuminate\Contracts\Auth\Authenticatable as UserContract;

trait InteractsWithAuthentication
{
    /**
     * Set the currently logged in user for the application.
     *
     * @param  \Illuminate\Contracts\Auth\Authenticatable  $user
     * @param  string|null  $guard
     * @return $this
     */
    public function actingAs(UserContract $user, $guard = null)
    {
        return $this-&gt;be($user, $guard);
    }

    /**
     * Set the currently logged in user for the application.
     *
     * @param  \Illuminate\Contracts\Auth\Authenticatable  $user
     * @param  string|null  $guard
     * @return $this
     */
    public function be(UserContract $user, $guard = null)
    {
        if (isset($user-&gt;wasRecentlyCreated) &amp;&amp; $user-&gt;wasRecentlyCreated) {
            $user-&gt;wasRecentlyCreated = false;
        }

        $this-&gt;app['auth']-&gt;guard($guard)-&gt;setUser($user);

        $this-&gt;app['auth']-&gt;shouldUse($guard);

        return $this;
    }

    /**
     * Assert that the user is authenticated.
     *
     * @param  string|null  $guard
     * @return $this
     */
    public function assertAuthenticated($guard = null)
    {
        $this-&gt;assertTrue($this-&gt;isAuthenticated($guard), 'The user is not authenticated');

        return $this;
    }

    /**
     * Assert that the user is not authenticated.
     *
     * @param  string|null  $guard
     * @return $this
     */
    public function assertGuest($guard = null)
    {
        $this-&gt;assertFalse($this-&gt;isAuthenticated($guard), 'The user is authenticated');

        return $this;
    }

    /**
     * Return true if the user is authenticated, false otherwise.
     *
     * @param  string|null  $guard
     * @return bool
     */
    protected function isAuthenticated($guard = null)
    {
        return $this-&gt;app-&gt;make('auth')-&gt;guard($guard)-&gt;check();
    }

    /**
     * Assert that the user is authenticated as the given user.
     *
     * @param  \Illuminate\Contracts\Auth\Authenticatable  $user
     * @param  string|null  $guard
     * @return $this
     */
    public function assertAuthenticatedAs($user, $guard = null)
    {
        $expected = $this-&gt;app-&gt;make('auth')-&gt;guard($guard)-&gt;user();

        $this-&gt;assertNotNull($expected, 'The current user is not authenticated.');

        $this-&gt;assertInstanceOf(
            get_class($expected), $user,
            'The currently authenticated user is not who was expected'
        );

        $this-&gt;assertSame(
            $expected-&gt;getAuthIdentifier(), $user-&gt;getAuthIdentifier(),
            'The currently authenticated user is not who was expected'
        );

        return $this;
    }

    /**
     * Assert that the given credentials are valid.
     *
     * @param  array  $credentials
     * @param  string|null  $guard
     * @return $this
     */
    public function assertCredentials(array $credentials, $guard = null)
    {
        $this-&gt;assertTrue(
            $this-&gt;hasCredentials($credentials, $guard), 'The given credentials are invalid.'
        );

        return $this;
    }

    /**
     * Assert that the given credentials are invalid.
     *
     * @param  array  $credentials
     * @param  string|null  $guard
     * @return $this
     */
    public function assertInvalidCredentials(array $credentials, $guard = null)
    {
        $this-&gt;assertFalse(
            $this-&gt;hasCredentials($credentials, $guard), 'The given credentials are valid.'
        );

        return $this;
    }

    /**
     * Return true if the credentials are valid, false otherwise.
     *
     * @param  array  $credentials
     * @param  string|null  $guard
     * @return bool
     */
    protected function hasCredentials(array $credentials, $guard = null)
    {
        $provider = $this-&gt;app-&gt;make('auth')-&gt;guard($guard)-&gt;getProvider();

        $user = $provider-&gt;retrieveByCredentials($credentials);

        return $user &amp;&amp; $provider-&gt;validateCredentials($user, $credentials);
    }
}
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