comment on

This is an out-of-the-box quick start for Devel::Cover.

Here is a simple Perl module file named Foo.pm:

package Foo;

use warnings;
use strict;

require Exporter;
our @ISA         = qw(Exporter);
our @EXPORT_OK   = qw(bar);

sub bar {
    my $x = shift;
    if ($x > 10) {
        return 'big';
    }
    else {
        print 'small';
    }
}

1;
[download]

Here is a single test, in a file named test.pl:

use warnings;
use strict;
use Foo qw(bar);
use Test::More tests => 2;

is(bar(77), 'big', 'check 77');
is(bar(22), 'big', 'check 22');
[download]

Both of these files are in the same directory. Run the test with coverage as follows:

perl -MDevel::Cover test.pl
[download]

I get this report as output:

1..2
Devel::Cover 0.65: Collecting coverage data for branch, condition, sta
+tement, subroutine and time.
    Pod coverage is unavailable.  Please install Pod::Coverage from CP
+AN.
Selecting packages matching:
Ignoring packages matching:
    /Devel/Cover[./]
Ignoring packages in:
    .
    C:/Perl-5.8/lib
    C:/Perl-5.8/site/lib
    C:/cpanfly-5.8/var/megalib
ok 1 - check 77
ok 2 - check 22
Devel::Cover: Writing coverage database to C:/Perl/cov/cover_db/runs/1
+273015783.352.06536
----------------------------------- ------ ------ ------ ------ ------
+ ------
File                                  stmt   bran   cond    sub   time
+  total
----------------------------------- ------ ------ ------ ------ ------
+ ------
C:/Perl/lib/ActivePerl/Config.pm       0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/ActiveState/Path.pm        0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/AutoLoader.pm              0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/B.pm                      14.6   16.7   16.7   12.5   95.7
+   15.0
C:/Perl/lib/B/Debug.pm                 0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/B/Deparse.pm               0.1    0.0    0.3    0.2    3.5
+    0.1
C:/Perl/lib/Carp.pm                    0.0    0.0    n/a    0.0    n/a
+    0.0
C:/Perl/lib/Config.pm                 52.6   40.0    n/a   40.0    0.0
+   47.1
C:/Perl/lib/Config_heavy.pl            0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/Data/Dumper.pm             0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/Digest/base.pm             0.0    0.0    n/a    0.0    n/a
+    0.0
C:/Perl/lib/DynaLoader.pm             70.0   46.4   66.7   50.0    0.7
+   61.2
C:/Perl/lib/Exporter.pm               52.1   42.9   32.4   44.4    0.0
+   43.5
C:/Perl/lib/Exporter/Heavy.pm         14.1    8.8   12.5   22.2    0.0
+   12.5
C:/Perl/lib/Fcntl.pm                   0.0    0.0    n/a    0.0    n/a
+    0.0
C:/Perl/lib/File/Basename.pm           0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/File/Glob.pm               0.0    0.0    n/a    0.0    n/a
+    0.0
C:/Perl/lib/File/Path.pm               0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/FileHandle.pm              0.0    0.0    n/a    0.0    n/a
+    0.0
C:/Perl/lib/IO.pm                      0.0    0.0    n/a    0.0    n/a
+    0.0
C:/Perl/lib/IO/File.pm                 0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/IO/Handle.pm               0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/IO/Seekable.pm             0.0    0.0    n/a    0.0    n/a
+    0.0
C:/Perl/lib/SelectSaver.pm             0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/Symbol.pm                  0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/Win32.pm                  26.9    0.0    0.0   16.7    0.0
+   17.2
C:/Perl/lib/XSLoader.pm                0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/base.pm                    0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/bytes.pm                   0.0    0.0    n/a    0.0    n/a
+    0.0
C:/Perl/lib/constant.pm                0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/overload.pm                0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/re.pm                      0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/lib/strict.pm                 84.6   50.0   50.0  100.0    0.0
+   73.1
C:/Perl/lib/vars.pm                   44.4   27.3    0.0  100.0    0.0
+   31.9
C:/Perl/lib/warnings.pm               24.2   17.1    0.0   25.0    0.0
+   18.2
C:/Perl/lib/warnings/register.pm       0.0    0.0    n/a    0.0    n/a
+    0.0
C:/Perl/site/lib/Cwd.pm                1.4    0.0    0.0    5.0    0.0
+    0.9
C:/Perl/site/lib/File/Spec/Unix.pm     0.0    0.0    0.0    0.0    n/a
+    0.0
C:/Perl/site/lib/File/Spec/Win32.pm   52.7   37.5   30.4   46.7    0.0
+   44.6
C:/Perl/site/lib/Storable.pm           0.0    n/a    n/a    0.0    n/a
+    0.0
C:/Perl/site/lib/Test/Builder.pm      42.5   21.9   18.2   54.1    0.0
+   35.9
.../site/lib/Test/Builder/Module.pm   87.9   75.0   33.3   83.3    0.0
+   82.6
C:/Perl/site/lib/Test/More.pm         12.1    0.6    2.0   20.8    0.0
+    8.8
Foo.pm                                90.0   50.0    n/a  100.0    0.0
+   86.7
test.pl                              100.0    n/a    n/a  100.0    0.0
+  100.0
Total                                 10.2    5.1    3.2   10.9  100.0
+    7.9
----------------------------------- ------ ------ ------ ------ ------
+ ------
[download]

It is a little verbose, but if you focus on the Foo.pm line, you'll see that only 50% of its branches were covered. This corresponds to the if branch inside the bar sub.

In reply to Re: Devel::Cover for Dummies (quick start) by toolic
in thread Devel::Cover for Dummies by Anonymous Monk

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