Stuff

file: common.inc.test:

...

class CommonIncTestCase extends DrupalTestCase {
  function test_valid_email_address() {
    $this->assertTrue(valid_email_address("admin@example.com"));
    $this->assertFalse(valid_email_address("admin@"));
    ...
  }

  function test_t() {
    $string = 'Plain string';
    $this->assertEquals($string, t($string));

    $string = 'String with @placeholder';
    $this->assertEquals('String with monkey', t($string, array('@placeholder' => 'monkey'));
    ...
  }

  ...
}

...