[PHPUnit] Testing output

Test contains not only unit test, integration test, but also the output of screen, including files etc.

For example, with the function exceptOutputString, we can test the string output by echo or print.

<?php
class OutputTest extends PHPUnit_Framework_TestCase
{
    public function testExpectFooActualFoo()
    {
        $this->outputString();    // Call my local function
        $this->expectOutputString('Hello world!');    // Comparaison
    }

    // local function 
    private function outputString()
    {
        echo "Hello world!";
    }
}
?>

Ref. Methods for output testing

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