Exercise bulk trigger functionality--use at least 20 records in your tests.
B
Only test code using the Standard User profile.
C
Access live organization data to validate SOQL queries and DML operations.
D
Use the isTest annotation. Classes defined with the isTest annotation do not count against your organization limit of 3 MB for all Apex code. See IsTest Annotation.
E
Use the runAs method to test your application in different user contexts.