eZ\Publish\Core\FieldType\Image\IO\Legacy::getInternalPath PHP Method

    public function getInternalPath($externalId)
    {
        return $this->publishedIOService->getInternalPath($externalId);
    }

 public function testGetInternalPath()
 {
     $id = 'path/file.png';
     $internalPath = 'var/test/storage/images/path/file.png';
     $this->publishedIoServiceMock->expects($this->once())->method('getInternalPath')->with($id)->will($this->returnValue($internalPath));
     $this->draftIoServiceMock->expects($this->never())->method('getInternalPath');
     self::assertEquals($internalPath, $this->service->getInternalPath($id));
 }