[5.6] Mysql integration test sample (#24672)

* Mysql integration test sample

* Style CI

.travis.yml

@@ -23,12 +23,14 @@ cache:
 services:
   - memcached
   - redis-server
+  - mysql
 
 before_install:
   - phpenv config-rm xdebug.ini || true
   - echo "extension = memcached.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - printf "\n" | pecl install -f redis
   - travis_retry composer self-update
+  - mysql -e 'CREATE DATABASE forge;'
 
 install:
   - if [[ $setup = 'stable' ]]; then travis_retry composer update --prefer-dist --no-interaction --prefer-stable --no-suggest; fi

tests/Integration/Database/Mysql/MysqlDatabaseTestCase.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Illuminate\Tests\Integration\Database\Mysql;
+
+use Orchestra\Testbench\TestCase;
+
+class MysqlDatabaseTestCase extends TestCase
+{
+    protected function getEnvironmentSetUp($app)
+    {
+        $app['config']->set('app.debug', 'true');
+
+        $app['config']->set('database.default', 'testbench');
+
+        $app['config']->set('database.connections.testbench', [
+            'driver' => 'mysql',
+            'host' => env('DB_HOST', '127.0.0.1'),
+            'username' => 'root',
+            'password' => '',
+            'database' => 'forge',
+            'prefix' => '',
+        ]);
+    }
+}

tests/Integration/Database/Mysql/MysqlEloquentCollectionFreshTest.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Illuminate\Tests\Integration\Database\Mysql;
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @group integration
+ */
+class MysqlEloquentCollectionFreshTest extends MysqlDatabaseTestCase
+{
+    public function setUp()
+    {
+        parent::setUp();
+
+        Schema::create('users', function ($table) {
+            $table->increments('id');
+            $table->string('email');
+        });
+    }
+
+    protected function tearDown()
+    {
+        Schema::drop('users');
+
+        parent::tearDown();
+    }
+
+    public function test_eloquent_collection_fresh()
+    {
+        User::insert([
+            ['email' => 'laravel@framework.com'],
+            ['email' => 'laravel@laravel.com'],
+        ]);
+
+        $collection = User::all();
+
+        User::whereKey($collection->pluck('id')->toArray())->delete();
+
+        $this->assertEmpty($collection->fresh()->filter());
+    }
+}
+
+class User extends Model
+{
+    protected $guarded = [];
+}