Question

I write some test cases for a function foo.

Some test cases fail, and to debug and find the problem, I wish to print some debug messages inside function foo.

My attempts are:

• Print to stdout, later I learned that Test::More does not want me to modify stdout.
• Print to stderr, my messages are not shown when I execute make test

I learned about diag note and explain, I did diag('test') inside foo however the message is not printed. Examples of them show that they are to be used inside test case function.

I really want to print a message in my foo when I run test case for it!

So what is the most correct way to achieve this?

Answer 1

Thanks for everyone’s attention.

I figured this out finally..

In my function

sub foo {
    diag('hahahah');
}

In my test:

ok(Package::foo());

And I did not see ‘hahahaha’ output when I ran perl Makefile.PL; make test

I read perldoc of Test::More and noticed that the example usages of diag/note are from the test file, not from the tested function,and that confused me little bit: I thought diag/note could ONLY be used in test case, not in the tested function.

Then why did not ‘hahahah’ print out at first place?

The reason is that… I did not use Test::More; in the package of foo. After put the line in there, I could see ‘hahahah’ in output.

I did not receive warning about diag not found.