public function testFilePathKeyWorksProperly()
{
$encrypted = $this->signer->sign('aaa', $this->privateKeyFilePath);
$this->assertInternalType('bool', $this->signer->verify($this->publicKeyFilePath, $encrypted, 'aaa'));
$this->assertTrue($this->signer->verify($this->publicKeyFilePath, $encrypted, 'aaa'));
}