laravel with codeception unitTesting : can't check return echo when using assertEquals()

environment　

• laravel 5.0.33
• codeception 2.0.16
  

App/helpers.php

function sample($message)
{
  echo $message;
}

tests/herpersTest.php

function testsample()
{
  $this->assertEquals('○○○○',sample('test'));
}

I want to check echo, but i cant check echo and print.
I know only return check.

What am I doing wrong?

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