Lcobucci\JWT\BuilderTest::signMustKeepAFluentInterface PHP Метод

    public function signMustKeepAFluentInterface() : Builder
    {
        $signer = $this->createMock(Signer::class);
        $signature = $this->createMock(Signature::class);
        $signer->expects($this->any())->method('sign')->willReturn($signature);
        $builder = $this->createBuilder();
        self::assertSame($builder, $builder->sign($signer, new Key('test')));
        return $builder;
    }