<?php
namespace GuzzleHttp\Tests\Stream;

use GuzzleHttp\Stream\BufferStream;
use GuzzleHttp\Stream\Exception\CannotAttachException;
use PHPUnit\Framework\TestCase;

class BufferStreamTest extends TestCase
{
public function testHasMetadata()
{
$b = new BufferStream(10);
$this->assertTrue($b->isReadable());
$this->assertTrue($b->isWritable());
$this->assertFalse($b->isSeekable());
$this->assertEquals(null, $b->getMetadata('foo'));
$this->assertEquals(10, $b->getMetadata('hwm'));
$this->assertEquals([], $b->getMetadata());
}

public function testRemovesReadDataFromBuffer()
{
$b = new BufferStream();
$this->assertEquals(3, $b->write('foo'));
$this->assertEquals(3, $b->getSize());
$this->assertFalse($b->eof());
$this->assertEquals('foo', $b->read(10));
$this->assertTrue($b->eof());
$this->assertEquals('', $b->read(10));
}

public function testCanCastToStringOrGetContents()
{
$b = new BufferStream();
$b->write('foo');
$b->write('baz');
$this->assertEquals('foo', $b->read(3));
$b->write('bar');
$this->assertEquals('bazbar', (string) $b);
$this->assertFalse($b->tell());
}

public function testDetachClearsBuffer()
{
$b = new BufferStream();
$b->write('foo');
$b->detach();
$this->assertEquals(0, $b->tell());
$this->assertTrue($b->eof());
$this->assertEquals(3, $b->write('abc'));
$this->assertEquals('abc', $b->read(10));
}

public function testExceedingHighwaterMarkReturnsFalseButStillBuffers()
{
$b = new BufferStream(5);
$this->assertEquals(3, $b->write('hi '));
$this->assertFalse($b->write('hello'));
$this->assertEquals('hi hello', (string) $b);
$this->assertEquals(4, $b->write('test'));
}

public function testCannotAttach()
{
$this->expectException(CannotAttachException::class);
$p = new BufferStream();
$p->attach('a');
}
}