public function testDropAllSchemas()
 {
     $this->adapter->createSchema('foo');
     $this->adapter->createSchema('bar');
     $this->assertTrue($this->adapter->hasSchema('foo'));
     $this->assertTrue($this->adapter->hasSchema('bar'));
     $this->adapter->dropAllSchemas();
     $this->assertFalse($this->adapter->hasSchema('foo'));
     $this->assertFalse($this->adapter->hasSchema('bar'));
 }