Many of us face this question on a daily basis. In many cases, the answer is yes. In certain cases, the answer is no or somewhere in between. It is important to weigh the benefits against the cost, and consider the extent to which code should be tested. A code coverage tool may report a line of code as covered, but that does not guarantee it has been thoroughly tested. Another consideration is the kinds of tests we write to begin with. For example, should a private function have tests? Or should it be covered by the tests of a public function that makes use of it? Should a function be covered by integration tests or end to end tests? We will explore these questions by examining several examples of code and determine whether and which types of tests are worth writing.

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