PHPUnit Manual

<?php
require_once 'PHPUnit/Extensions/OutputTestCase.php';
 
class OutputTest extends PHPUnit_Extensions_OutputTestCase
{
    public function testExpectFooActualFoo()
    {
        $this->expectOutputString('foo');
        print 'foo';
    }
 
    public function testExpectBarActualBaz()
    {
        $this->expectOutputString('bar');
        print 'baz';
    }
}
?>

phpunit OutputTest
PHPUnit 3.4.14 by Sebastian Bergmann.

.F

Time: 0 seconds

There was 1 failure:

1) OutputTest::testExpectBarActualBaz
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ -1 +1 @@
-bar
+baz

FAILURES!
Tests: 2, Assertions: 2, Failures: 1.