An overview of some methods of perl testing.

1. Intermediate Perl Testing
(or, Let’s Not Make A Mess Of Things, Shall We?)
Josh Heumann

2. Have you seen these tests?
is_deeply(
get_recipes(),
[qw/ lemon_curd pancakes enchiladas /],
‘all of the recipes are there’
);
SKIP: {
skip ‘No ingredients’, 2, if @ingredients < 1;
is( $number, 23, ‘and the number is 23’ );
};
dies_ok(
sub { eat_cake },
qr/Cake isn’t chocolate/,
‘only eat chocolate cake’
);

3. What this talk will do

4. What this talk won’t do

5. Why
Have
Altercations
That
Encourage
Violent
Excitable
Rants?

6. Why
Have
Altercations
That
Encourage
Violent
Excitable
Rants?

8. Make them easy to run

9. Run early, run often

10. Blackbox testing

11. Blackbox testing

12. Blackbox testing

13. Glassbox testing

14. Whatever.

15. Testing scripts
#!/usr/bin/perl
use strict;
use warnings;
get_jiggy();
sub get_jiggy {
# details, details
}

16. Testing scripts
__FILE__

17. Testing scripts
__FILE__
.pl
gy
g
ji
t_
ge
in/
b

18. Testing scripts
$0

19. Testing scripts
$0
AKA $PROGRAM_NAME

20. Testing scripts
$0
AKA $PROGRAM_NAME
pl
y.
g
jig
_
et
/g
in
b

21. Testing scripts
$0
AKA $PROGRAM_NAME
psl.t
.
ys
ge
jggin
i
ig
j_
et
t_
es g
/bin/
t
t

22. Testing scripts
$0 __FILE__
!=
<>
s.tne .pl
es ≠
in gy
igg g
ji
j t_
t_ ge
es
t in/
t/ b

23. Testing scripts
$0 __FILE__
eq
==
.pl
gy .pl
g
ji gy
t_ g
ji
ge t_
in/ ge
b in/
b

24. Testing scripts
#!/usr/bin/perl
use strict;
use warnings;
get_jiggy() if $0 eq __FILE__;
sub get_jiggy {
# details, details
}

25. Testing scripts
#!/usr/bin/perl
use strict;
use warnings;
use Test::More tests => 42;
require_ok( ‘bin/get_jiggy.pl’ );
can_ok( ‘main’, ‘get_jiggy’, ‘jigginess achieved’ );
# test the details

27. Code coverage

28. Code coverage
cover -test

29. Code coverage
cover -test
./Build testcover

30. Code coverage
cover -test
./Build testcover
HARNESS_PERL_SWITCHES=-MDevel::Cover make test

31. Demonstration time!

32. Version control

33. Version control

34. Version control

35. Testing and version control
?

36. Testing and version control

37. Testing and version control

38. Testing and version control

39. Testing and version control

40. Testing and version control

41. Testing and version control

42. Testing and version control

43. Testing and version control

44. Testing and version control

45. Testing and version control

46. Testing and version control

47. Version control

49. Reusing test code

50. Reusing test code
for(qw/ is_hilarious is_annoying is_bewildering /) {
can_ok( Child, $_ );
is( Child->$_, 1, “...and the child $_” );
}

51. Reusing test code
sub _test_accessor {
my ( $method ) = @_;
my $getter = quot;get_$methodquot;;
my $setter = quot;set_$methodquot;;
can_ok( 'Cat', $getter );
can_ok( 'Cat', $setter );
is( Cat->new->$getter, undef, quot;...and $method is
undef to start withquot; );
....
}
_test_accessor( ‘sleep’ );

52. Reusing test code
sub _test_accessor {
my ( $method ) = @_;
my $getter = quot;get_$methodquot;;
my $setter = quot;set_$methodquot;;
can_ok( 'Cat', $getter );
can_ok( 'Cat', $setter );
is( Cat->new->$getter, undef, quot;...and $method is
undef to start withquot; );
....
}
_test_accessor( $_ ) for(qw/ sleep eat purr /);

53. Whatever.

54. Custom test libraries

55. Custom test libraries
$ prove t
t/00_basics....ok
All tests successful.
Files=1, Tests=377, 1 wallclock secs ( 0.17 cusr +
0.02 csys = 0.19 CPU)

56. Custom test libraries
package Test::Clowns;
use Test::Builder;
use Perl6::Junction qw/ any /;
my $Test = Test::Builder->new;
sub test_clowns {
my($clown, $name) = @_;
$clown->hop_out_of_a_very_small_car();
$Test->ok( $clown->can_juggle, $name );
$Test->ok( $clown->has_pies, $name );
if( any($clown->faces) eq ‘scary’ ) {
$Test->fail( “clowns shouldn’t be scary” );
}
$Test->ok( $clown->is_scary, $name );
}

57. Custom test libraries
use TAP::Harness;
my $harness = TAP::Harness->new(
verbose => 1,
lib => [ 'lib', 'blib/lib' ],
);
$harness->runtests(@tests);
+

58. Fixtures

59. our %clients = (
1001 => {
client_id => 1001,
dob => '1926-05-25',
fname => 'Miles',
lname => 'Davis',
sex => 'Male',
race => 'Black',
marital_status => 'Divorced',
substance_abuse => 'Yes',
alcohol_abuse => 'Yes',
gambling_abuse => 'Unknown',
religion => 'Muslim',
},

60. 1002 => {
client_id => 1002,
dob => '1922-04-21',
fname => 'Charles',
lname => 'Mingus',
sex => 'Male',
race => 'Other',
marital_status => 'Married',
substance_abuse => 'No',
alcohol_abuse => 'Yes',
gambling_abuse => 'Unknown',
religion => 'Buddhist',
},
# etc,
# etc,
# etc.
);

61. for my $client_id (keys %clients) {
Test::Client->new(
id => $clients{ $client_id }
)->save;
}

62. for my $client_id (keys %clients) {
Test::Client->new(
id => $clients{ $client_id }
)->save;
}
Test::Client->new(1001)->save;

63. sub create_test_client {
Test::Client->new( %args )->save;
}
create_test_client(
id => 2,
dob => undef,
);

64. sub create_test_client {
$args{ dob } ||= ‘1970-01-01’;
Test::Client->new( %args )->save;
}
create_test_client(
id => 2,
dob => undef,
);

65. sub create_test_client {
$args{ dob } ||= ‘1970-01-01’;
$args{ shrink } ||= create_test_shrink;
Test::Client->new( %args )->save;
}
create_test_client(
id => 2,
dob => undef,
);

67. Mocking

68. Mocking

69. Mocking
Test::MockObject

70. Mocking
Test::MockObject
Test::MockClass

71. Mocking
Test::MockObject
Test::MockClass
Sub::Override

72. Mocking
Test::MockDBI
Test::Mock::LWP
Test::Mock::HTTP::Request
Test::Mock::HTTP::Response

74. Selenium

75. How to
win friends
and
convince
others to
test

76. Speeding up tests

77. Where to start?

78. Review

79. Review
Make your tests easy to run

80. Review
Make your tests easy to run
Run them often

81. Review
Make your tests easy to run
Run them often
Test your modules

82. Review
Make your tests easy to run
Run them often
Test your modules
Test your scripts

83. Review
Make your tests easy to run
Run them often
Test your modules
Test your scripts
Improve your code coverage with Devel::Cover

84. Review
Make your tests easy to run
Run them often
Test your modules
Test your scripts
Improve your code coverage with Devel::Cover
Use version control, and check in often

85. Review
Make your tests easy to run
Run them often
Test your modules
Test your scripts
Improve your code coverage with Devel::Cover
Use version control, and check in often
Reuse your test code

86. Review

87. Review
Make a test library

88. Review
Make a test library
Use fixtures

89. Review
Make a test library
Use fixtures
Mock when necessary

90. Review
Make a test library
Use fixtures
Mock when necessary
Test quietly if you don’t have support

91. Review
Make a test library
Use fixtures
Mock when necessary
Test quietly if you don’t have support
Start with the most-changed part of the code

92. Questions?

93. Thanks!
• Michael Schwern
• Kirrily Robert
• OSDC
• realestate.com.au
• you

94. Josh Heumann
josh@joshheumann.com