hello 

    i am using test,startTest()  and test.stopTest() method in test class.

   i am  facing a error   :

    Method does not exist or incorrect signature: Test.startTest() at line 16 column 9

    my code is : 

@isTest

private class testclass{

public static testMethod void TestOverwriteTestAccountDescriptions(){
// Perform our data preparation.
List<Account> accounts = new List<Account>{};

for(Integer i = 0; i < 200; i++){
Account a = new Account(Name = 'Test Account ' + i);
accounts.add(a);
}

// Start the test, this changes governor limit context to
// that of trigger rather than test.
Test.startTest();

// Insert the Account records that cause the trigger to execute.
insert accounts;

// Stop the test, this changes limit context back to test from trigger.
Test.stopTest();

// Query the database for the newly inserted records.
List<Account> insertedAccounts = [SELECT Name, Description
FROM Account
WHERE Id IN : accounts];

// Assert that the Description fields contains the proper value now.
for(Account a : insertedAccounts){
System.assertEquals(
'This Account is probably left over from testing. It should probably be deleted.',
a.Description);
}
}
}

Hi,

Make sure that your list of class should not contain class name as 'test',

if any of your class name is test please rename the class name