GuzzleHttp\Tests\Psr7\CachingStreamTest::testCanSeekToReadBytesWithPartialBodyReturned PHP Method

    public function testCanSeekToReadBytesWithPartialBodyReturned()
    {
        $stream = fopen('php://temp', 'r+');
        fwrite($stream, 'testing');
        fseek($stream, 0);
        $this->decorated = $this->getMockBuilder('\\GuzzleHttp\\Psr7\\Stream')->setConstructorArgs([$stream])->setMethods(['read'])->getMock();
        $this->decorated->expects($this->exactly(2))->method('read')->willReturnCallback(function ($length) use($stream) {
            return fread($stream, 2);
        });
        $this->body = new CachingStream($this->decorated);
        $this->assertEquals(0, $this->body->tell());
        $this->body->seek(4, SEEK_SET);
        $this->assertEquals(4, $this->body->tell());
        $this->body->seek(0);
        $this->assertEquals('test', $this->body->read(4));
    }