Python Testing with pytest

Creating Test Cases

As with determining the goals and scope of your test strategy, generating test cases is also easier if you take a methodical approach. For generating an initial set of test cases, these criteria will be helpful:

• Start with a non-trivial, “happy path” test case.

• Then look at test cases that represent

  • interesting sets of input,
  • interesting starting states,
  • interesting end states, or
  • all possible error states.

Some of these test cases will overlap. If a test case satisfies more than one of the above criteria, that’s fine. Let’s go through a few of the Cards features to get the hang of it.

For count, a happy path test case might be, “For an empty database, count returns 0.” However, I’d also consider this a trivial example. ...