Thanks Bob.

But the puzzling thing is when I just run all tests in salesforce production today, the test cases work fine including the test class which is flagged as an error when I try deploying my test class into production.

It is as if things are fine till I move my class in as it it is tipping the scale over. But my test class cannot possibly be running more than 100 times. That being said, the existing test class is pretty huge but it is not having any issues as of today.

I am putting the code of my test class just in case:

@isTest
private class TestAccountDuplicateWebsiteTrigger {

    
    static testMethod void myUnitTest() {
    	try{
        // TO DO: implement unit test
        Account a1;      
        a1 = new Account();
		a1.name = 'GMSTest';	
		a1.Website = 'www.test.com';	        
		
		 
		
        Account a2;      
        a2 = new Account();
		a2.name = 'GMSTest2';	
		a2.Website = 'www.test.com';	        
		
        
        Account a3;      
        a3 = new Account();
		a3.name = 'GMSTest3';	
		a3.Website = 'www.test1.com';	        
		
		
		insert a1;
		insert a2;
		insert a3;
		
		
    	}
    	catch (Exception e)
    	{
    	}
    	
    }
}

 trigger being tested:

trigger osv_unique_website_for_account on Account (before insert, before update) {	
	
		//Map which has no duplicates with website as the key
		Map<String, Account> accountMap = new Map<String, Account>();
		
		for (Account account: System.Trigger.new)
		{
			//Ensure that during an update, if an website does not change - it should not be treated as a duplicate
			if ((account.Website != null) && (System.Trigger.isInsert ||			
				(account.Website != System.Trigger.oldMap.get(account.Id).Website))) 
				{
					//check for duplicates among the new accounts in case of a batch
					 if (accountMap.containsKey(account.Website)) 
					 {
	                	account.Website.addError('Cannot save account. Website already exists.');
	            	 } 
	            	 else 
	            	 {
						accountMap.put(account.Website, account);
	            	 }
					
				}		
		}
		
		//Now map containing new account websites has been created. 
		//Check them against the account websites that ALREADY EXIST in salesforce. If website exists, display error.
		for (Account account : [SELECT Website FROM Account WHERE Website IN :accountMap.KeySet()]) 
		{
			Account newAccount = accountMap.get(Account.Website);
			if (newAccount!=null)
			{
				newAccount.Website.addError('Cannot save account. Website already exists.');
			}
		}	
	
	
	
}