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After build unit test for your function, may be you are not sure one test will applicable for all cases. You can test with several static values, make sure you write right function.

You can write like following code:

<?php

define('RATE', 0.05);

function interest_per_year($amount)
{
  return round($amount * RATE, 2);
}

// Include test library
require_once 'simpletest/unit_tester.php' ;
require_once 'simpletest/reporter.php' ;

class TestingTestCase extends UnitTestCase{

  function TestingTestCase($name = '')
  {
    $this->UnitTestCase( $name );
  }
	
  function TestInterest(){
    $this->assertEqual(5, interest_per_year(100));
    $this->assertEqual(2.2, interest_per_year(73));	
  }
	
}

// run test
$test = new TestingTestCase( 'Testing Unit Test' );
$test->run(new HTMLReporter());

?>

Following image show you one test success, one test fail.