Sample PHPUnit test for TDD, PHPUnit doubts

gistfile1.php

public function testMyObject()
{
  $TestObject = new OBJECT();
    $this->assertInstanceOf('OBJECT', $TestObject, 'Test the Object Created is the right class');
    $this->assertInstanceOf('PARENT_OBJECT', $TestObject, 'Test the Object Created is extended from the parent right class');
	
	$this->assertTrue(method_exists($TestObject, "ParentMethod"), "The parent method is expected and must exist.");
}

protected static function InvalidArguementsData()
{
	return array(
		array('ABC', 'Text String is Invalid'),
		array('1', 'Number passed as string is Invalid'),
		array(NULL, 'NULL is Invalid'),
	);
}

/**
 * @dataProvider InvalidArguementsData
 * @expectedException InvalidArgumentException
 */
public function testInvalidArguements($Parameter, $Description)
{
	$TestObject = new OBJECT($Parameter);
}

protected static function ValidArguementsData()
{
	return array(
		array(0, 0, 'Zero should return 0'),
		array(1, 10, 'One should return 10'),
		array('-1', 20, 'Negative Number returns 20'),
	);
}

/**
 * @dataProvider ValidArguementsData
 */
public function testValidArgument($Parameter, $ReturnValue, $Description)
{
	$TestObject = new OBJECT(Parameter);
	$this->assertEquals($ReturnValue, $TestObject->GetResult, $Description);
}