Test Command Line Program

Question

So, I have this command line program binary (let's say its named ./prog) that I want to test. I want to use shunit2 as my testing framework. Unfortunately it asks the user for input. How can I test this? For example:

start ./prog
prog asks: Username:
Check/assert that the string is the expected string (string should be accessible to shunit2)
Now I need to specify an input, say John
prog prints something in response, say it echoes John
Check/assert that John is the expected output (string should be again accessible to shunit2)

How do I assert/verify/check this in shunit2, i.e. that the given input John results in the correct output string John?

I know there exist tools like 'expect' or 'expect-lite'. But, how would I test this using the shell only?

Or, how can I integrate expect or expect-lite so that I can verify the input using shunit2?

You wouldn't. Because you can't. Use expect.

Ignacio Vazquez-Abrams
– Ignacio Vazquez-Abrams

2013-11-19 12:19:14 +00:00
Commented Nov 19, 2013 at 12:19 — Ignacio Vazquez-Abrams
– Ignacio Vazquez-Abrams, Commented Nov 19, 2013 at 12:19

glenn jackman · Accepted Answer · 2013-11-19 14:37:57Z

1

You probably just need to pass the input to prog's stdin. Among many ways to do that is this:

{ echo "Username"; echo "John"; } | ./prog

answered Nov 19, 2013 at 14:37

glenn jackman

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