Simplify built-in testing in prep for Dusk. (#16667)

Simplifies built-in testing and cleans up architecture in prep for Dusk integration.

src/Illuminate/Foundation/Testing/Concerns/InteractsWithAuthentication.php

@@ -2,8 +2,38 @@
 
 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  $driver
+     * @return $this
+     */
+    public function actingAs(UserContract $user, $driver = null)
+    {
+        $this->be($user, $driver);
+
+        return $this;
+    }
+
+    /**
+     * Set the currently logged in user for the application.
+     *
+     * @param  \Illuminate\Contracts\Auth\Authenticatable  $user
+     * @param  string|null  $driver
+     * @return void
+     */
+    public function be(UserContract $user, $driver = null)
+    {
+        $this->app['auth']->guard($driver)->setUser($user);
+
+        $this->app['auth']->shouldUse($driver);
+    }
+
     /**
      * Assert that the user is authenticated.
      *

src/Illuminate/Foundation/Testing/Concerns/InteractsWithConsole.php

@@ -6,13 +6,6 @@
 
 trait InteractsWithConsole
 {
-    /**
-     * The last code returned by Artisan CLI.
-     *
-     * @var int
-     */
-    protected $code;
-
     /**
      * Call artisan command and return code.
      *
@@ -22,6 +15,6 @@ trait InteractsWithConsole
      */
     public function artisan($command, $parameters = [])
     {
-        return $this->code = $this->app[Kernel::class]->call($command, $parameters);
+        return $this->app[Kernel::class]->call($command, $parameters);
     }
 }

src/Illuminate/Foundation/Testing/Concerns/InteractsWithDatabase.php

@@ -27,19 +27,6 @@ protected function seeInDatabase($table, array $data, $connection = null)
         return $this;
     }
 
-    /**
-     * Assert that a given where condition does not exist in the database.
-     *
-     * @param  string  $table
-     * @param  array  $data
-     * @param  string  $connection
-     * @return $this
-     */
-    protected function missingFromDatabase($table, array $data, $connection = null)
-    {
-        return $this->notSeeInDatabase($table, $data, $connection);
-    }
-
     /**
      * Assert that a given where condition does not exist in the database.
      *
@@ -49,19 +36,6 @@ protected function missingFromDatabase($table, array $data, $connection = null)
      * @return $this
      */
     protected function dontSeeInDatabase($table, array $data, $connection = null)
-    {
-        return $this->notSeeInDatabase($table, $data, $connection);
-    }
-
-    /**
-     * Assert that a given where condition does not exist in the database.
-     *
-     * @param  string  $table
-     * @param  array  $data
-     * @param  string  $connection
-     * @return $this
-     */
-    protected function notSeeInDatabase($table, array $data, $connection = null)
     {
         $database = $this->app->make('db');