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    <p>On how to test if the setting worked see @Gordons answer.</p> <h2>I'd like to argue that you don't <em>need</em> to test that though.</h2> <p>Your unit tests should make sure the <strong>public</strong> API of your class works as expected. You don't care (for the sake of testing) how your values are stored internally so you don't <em>need</em> to make assertions on it. Doing it that way also makes your tests only test <strong>what your class does</strong> and not <strong>how the class does it</strong></p> <p><strong>The point is that you shouldn't have to change your tests when you change your class without affecting what it does</strong></p> <p>For the sake of the argument let's say SomeClass is something that in the end spits out HTML.</p> <pre><code>class SomeClass { public function setValue($name, $value) { // do some stuff } public function doSomething(array $values) { foreach ($values as $name=&gt;$value) { $this-&gt;setValue($name, trim($value)); } } public function createHTML() { $return = ""; foreach($this-&gt;values as $key =&gt; $value) { $return .= "&lt;div is='$key'&gt;$value&lt;/div&gt;"; } return $return; } } </code></pre> <h2>If that is everything your class does an absolutely sufficient test for that class could look like this:</h2> <pre><code>class SomeClassTest extends PHPUnit_Framework_TestCase { public function testHtmlGenerationWithTwoValuesSet() { $o = new SomeClass(); $o-&gt;setValue("foo", "bar"); $o-&gt;setValue("x", "y"); $result = $o-&gt;createHTML(); $this-&gt;assertSame( 2, substr_count("&lt;div&gt;", $result), "There should be as many divs as there are values set" ); $this-&gt;assertTrue( strpos("&lt;div&gt;bar&lt;/div&gt;") !== false "String should contain a set value enclosed in divs" ); } } </code></pre> <p>Again: It is about testing <strong>behavior</strong> of your class, <strong>not testing every method on its own</strong>. Your test suite will be much more valuable if you got about it this way</p> <p>While the example with html might not be the right one it shows how to test behavior pretty nicely (i hope)</p>
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