Perl testing 101

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Made for $work to explain unit tests to old time COBOLers.

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Perl testing 101

  1. 1. Perl Testing 101 Craig Treptow, August, 2013
  2. 2. Unit Tests Goal Isolate each part of a program and show that the individual parts are correct.
  3. 3. Unit Tests Benefits ● Find problems earlier ● Facilitate code changes ○ Help ensure changes did not affect other behavior ● Makes integration testing easier ● Code becomes “self documenting” ○ Just look at the tests
  4. 4. Unit Tests Reality ● They do not “prove” software is correct ● They can be ○ wrong ○ hard to set up ● They do ○ increase programmer confidence ○ need to be treated like “real code”
  5. 5. Perl Testing What is test code? It’s just Perl code: #!/usr/bin/perl -w print "1..1n"; print 1 + 1 == 2 ? "ok 1n" : "not ok 1n"; Since 1 + 1 is 2, it prints: 1..1 ok 1
  6. 6. Perl Testing 1..1 ok 1 This says: ● I’m going to run 1 test ● The test passed
  7. 7. Perl Testing Writing that kind of code would get tedious. So, start with Test::Simple: #!/usr/bin/perl -w use Test::Simple tests => 1; ok( 1 + 1 == 2 ); That runs the same test as before.
  8. 8. Perl Testing Want more tests? #!/usr/bin/perl -w use Test::Simple tests => 2; ok( 1 + 1 == 2 ); ok( 2 + 2 == 5 ); Run the test: perl simple.t Produces: 1..2 ok 1 not ok 2 # Failed test (test.pl at line 5) # Looks like you failed 1 tests of 2.
  9. 9. Perl Testing Before we go on: a few conventions ● Test files are kept in folders called ‘t’ ● Test files are named <something>.t ○ 00-<test prerequisites>.t ○ 10-<module name>.t ○ 20-<module name>.t There aren’t “rules”, it’s Perl!!
  10. 10. Perl Testing Test::Simple ● Only provides ok() ● Can be awkward ○ Can’t tell what you got for a result ○ Only True/False (ok/not ok) There is hope...
  11. 11. Perl Testing Test::More ● ok(), is(), isnt() ● like(), unlike() ● cmp_ok(), can_ok(), isa_ok() ● use_ok(), require_ok() ● is_deeply() ● eq_array(), eq_hash(), eq_set

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