Chapter 32. Case Study: E-Mail Addresses
“Beware of bugs in the above code; I have only proved it correct, not tried it.”
Donald Knuth
This study involves breaking down a complex test, which represents a complex business rule, into simpler tests. The simpler tests can decrease time in understanding and implementing the rule.
Context
Almost every application that involves communication requires an e-mail address. When you enter an e-mail address, you should parse it to ensure that it is in a valid format. The process of verifying that an e-mail address is actually valid requires an exterior action, such as sending an e-mail to the address and checking that it was not rejected.
The testers for one company had a set of e-mail address examples ...
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