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a framework to learn-by-doing for Perl, with a heavy emphasis on testing

tl;dr: run, fix test failures specified, repeat until all tests pass


to confirm your environment is working:
conor@box $ perl -c syntax OK


to get started:

* run 'perl', which calls each koan (about_*.pl) in order. you should see something like:

1.    $ perl
2.    not ok 1 - 1 is equal to itself
3.    #   Failed test '1 is equal to itself'
4.    #   at line 15.
5.    #          got: '1'
6.    #     expected: '2'
8.    Bail out!  he who asks a question is a fool for a minute; he who does not remains a fool forever

so you won't actually see the line numbers, but they're useful in explaining what's going on:

line 2 - provides test result 'not ok', test count '1', and test name '1 is equal to itself'
line 3 - provides a more human friendly representation of line 1
line 4 - provides the file and line number of the failing test
line 7 - displays your progression through the Koans
line 8 - some (hopefully) inspirational sayings

* now that you know which test is failing, and in which koan that test lives, go fix the test -- repeat until all tests pass:

Perl::Koans uses the string '__' to indicate where you should fill in your code, typically a value or variable.

  • for example, if you see: is (1, __, "1 is equal to itself test");

  • to pass the test, you would fill in '1': is (1, 1, "1 is equal to itself test");

in other cases, you may see a failing test without the '__', but the intent is the same: fix the test.

  • for example, if you see: is (1, 2, "1 is equal to itself test");

  • pass the test by replacing the 'expected' value to '1': is (1, 1, "1 is equal to itself test");

Perl::Koans provides some anchors for where you should be looking to fix tests:

# your code goes below this line

# your code goes above this line

you can walk the road (i.e. fix tests) in whatever editor you choose, here are a few suggestions:

* Windows - Notepad++, Eclipse
* Unix    - GEdit, Eclipse, vim
* OS X    - Text Wrangler, Eclipse, vim

Komodo Edit is another option, available for all platforms


tests aren't just used in 'if' statements!

Test::More is the de facto standard framework for testing in Perl.

the functions used in Perl::Koans:

* is(<got>, <expected>, <testname>) - successful if <got> is equal to <expected> 
* ok(<value>, <testname>) - successful if <value> is true
* like(<got>, <regular_expression>, <testname>) - successful if <got> matches <regular_expression>