Lcobucci\JWT\Configuration::getSigner PHP Method

    public function getSigner() : Signer
    {
        if ($this->signer === null) {
            $this->signer = new Sha256();
        }
        return $this->signer;
    }

 /**
  * @test
  *
  * @covers \Lcobucci\JWT\Configuration
  * @covers \Lcobucci\JWT\Builder
  * @covers \Lcobucci\JWT\Token
  * @covers \Lcobucci\JWT\Signature
  * @covers \Lcobucci\JWT\Claim\Factory
  * @covers \Lcobucci\JWT\Claim\Basic
  * @covers \Lcobucci\JWT\Signer\Key
  * @covers \Lcobucci\JWT\Signer\BaseSigner
  * @covers \Lcobucci\JWT\Signer\Ecdsa
  * @covers \Lcobucci\JWT\Signer\Ecdsa\KeyParser
  * @covers \Lcobucci\JWT\Signer\Ecdsa\EccAdapter
  * @covers \Lcobucci\JWT\Signer\Ecdsa\SignatureSerializer
  * @covers \Lcobucci\JWT\Signer\Ecdsa\Sha256
  */
 public function everythingShouldWorkWithAKeyWithParams()
 {
     $builder = $this->config->createBuilder();
     $signer = $this->config->getSigner();
     $token = $builder->identifiedBy('1')->canOnlyBeUsedBy('http://client.abc.com')->issuedBy('http://api.abc.com')->with('user', ['name' => 'testing', 'email' => '*****@*****.**'])->withHeader('jki', '1234')->sign($signer, static::$ecdsaKeys['private-params'])->getToken();
     self::assertTrue($token->verify($signer, static::$ecdsaKeys['public-params']));
 }