Fix connection resolver and static side effect

Fixes laravel#22133

Signed-off-by: Beau Hastings <beausy@gmail.com>

tests/Database/DatabaseEloquentGlobalScopesTest.php

@@ -4,12 +4,26 @@
 
 use Mockery as m;
 use PHPUnit\Framework\TestCase;
+use Illuminate\Database\Capsule\Manager as DB;
+use Illuminate\Database\Eloquent\Model as Eloquent;
 
 class DatabaseEloquentGlobalScopesTest extends TestCase
 {
+    public function setUp()
+    {
+        parent::setUp();
+
+        tap(new DB)->addConnection([
+            'driver'    => 'sqlite',
+            'database'  => ':memory:',
+        ])->bootEloquent();
+    }
+
     public function tearDown()
     {
         m::close();
+
+        Eloquent::unsetConnectionResolver();
     }
 
     public function testGlobalScopeIsApplied()

tests/Database/DatabaseEloquentIntegrationTest.php

@@ -125,6 +125,7 @@ public function tearDown()
         }
 
         Relation::morphMap([], false);
+        Eloquent::unsetConnectionResolver();
     }
 
     /**

tests/Database/DatabaseEloquentModelTest.php

@@ -202,6 +202,7 @@ public function testWithMethodCallsQueryBuilderCorrectly()
     public function testWithoutMethodRemovesEagerLoadedRelationshipCorrectly()
     {
         $model = new EloquentModelWithoutRelationStub;
+        $this->addMockConnection($model);
         $instance = $model->newInstance()->newQuery()->without('foo');
         $this->assertEmpty($instance->getEagerLoads());
     }
@@ -1832,6 +1833,15 @@ public function setIncrementing($value)
     {
         $this->incrementing = $value;
     }
+
+    public function getConnection()
+    {
+        $mock = m::mock('Illuminate\Database\Connection');
+        $mock->shouldReceive('getQueryGrammar')->andReturn(m::mock('Illuminate\Database\Query\Grammars\Grammar'));
+        $mock->shouldReceive('getPostProcessor')->andReturn(m::mock('Illuminate\Database\Query\Processors\Processor'));
+        $mock->shouldReceive('getName')->andReturn('name');
+        return $mock;
+    }
 }
 
 class EloquentKeyTypeModelStub extends EloquentModelStub