Test class for Case Close

Please post your test class which you are using. I hope you are using below code.

@isTest
private class CheckValidationonCaseCloseTest 
{
    static testMethod void myUnitTest() 
	{
		Case p = new Case();
		p.Status='New';
		p.subject='Test', 
		p.Signature_Required__c= true;
		insert p;
		try
		{	
			p.Status='Closed';
			update p;
		}Catch(Exception ee)
		{}	
	}
}