React\Tests\Stream\BufferTest::testWriteInDrain PHP Метод

    public function testWriteInDrain()
    {
        $stream = fopen('php://temp', 'r+');
        $loop = $this->createWriteableLoopMock();
        $loop->preventWrites = true;
        $buffer = new Buffer($stream, $loop);
        $buffer->softLimit = 2;
        $buffer->on('error', $this->expectCallableNever());
        $buffer->once('drain', function ($buffer) {
            $buffer->listening = false;
            $buffer->write("bar\n");
        });
        $this->assertFalse($buffer->write("foo"));
        $loop->preventWrites = false;
        $buffer->listening = false;
        $buffer->write("\n");
        fseek($stream, 0);
        $this->assertSame("foo\nbar\n", stream_get_contents($stream));
    }