PHPUnit ‘Error : Class “pathtoclassclassToTest” not found’

I’m trying to write some unit tests. However no matter what I do I keep getting this error:

Error : Class “pathtoclassclassToTest” not found

The test I’m trying to run has a simple structure:

<?php
namespace testsunit;

use pathtoclassclassToTest;
use PHPUnitFrameworkTestCase;

class className extends TestCase
{
  public function testname()
  {
    $classToTest = new classToTest;
    $result = $classToTest->test();
    $this->assertTrue($result);
  }
}

The classToTest looks like this:

<?php
namespace pathtoclass;

class classToTest
{
  public function test()
  {
    return true;
  }
}