testEmitsBufferLevel

testEmitsBufferLevelTest.php

<?php
    public function testEmitsBufferLevel()
    {
        ob_start();
        echo "level". ob_get_level() . " "; // 2
        ob_start();
        echo "level". ob_get_level() . " "; // 3
        ob_start();
        echo "level". ob_get_level() . " "; // 4

        $response = (new Response())
            ->withStatus(200)
            ->withAddedHeader('Content-Type', 'text/plain');
        $response->getBody()->write('Content!');

        ob_start();
        $this->emitter->emit($response);
        $this->assertEquals('Content!', ob_get_contents());
        ob_end_clean();

        $this->assertEquals('level4 ', ob_get_contents(), 'current buffer level string must remains after emit');
        ob_end_clean();

        $this->emitter->emit($response, 2);
        $this->assertEquals('level2 level3 Content!', ob_get_contents(), 'must buffer until specified level');
        ob_end_clean();
    }