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kward / shunit2

shUnit2 is a xUnit based unit test framework for Bourne based shell scripts.

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Testing CLI output

markand opened this issue · comments

commented

Hello,

I'm trying to create tests for checking that the program outputs correctly what I want. For example, I'd to check that the following output when I call my application:

name:    foo
version: 1.0

Since it's multilines output, it's pretty complicated to check line by line. Do you have some recommendation for that purpose?

I'm thinking about creating a file as output expectation and perhaps calling diff on it in an assert. The only problem is that I'd need to show the diff each time it fails.

commented

Call diff without assert, redirecting the output to a temporary file. Then check the result of diff explicitly. In case of a mismatch, cat the temporary file before you call fail. In case of a match, call one of the assert functions with static values, to record the success. Put all that into a custom assert function.

If you don't require diff output, can't you use the regular assertEquals with a multi-line string argument?

commented

The tests in shunit2_misc_test.sh (e.g. testIssue69()) show how this is done for testing shUnit2 itself.