public function convertWithRemoveOptionDoesNotRemoveSource()
{
$this->converter->addMapping(['foo'], ['bar'], false);
$result = $this->converter->convert(['foo' => 'foobar']);
$this->assertCount(2, $result);
$this->assertSame('foobar', $result['foo']);
$this->assertSame('foobar', $result['bar']);
}