Forum: Ruby rcov 0.5.0: code coverage + callsite info, RubyGems, Rant...

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Mauricio F. (Guest)
on 2006-05-30 13:58
(Received via mailing list)
Source code, additional information, screenshots... available at
    http://eigenclass.org/hiki.rb?rcov
Release information:
    http://eigenclass.org/hiki.rb?rcov+0.5.0
Sample cross-referenced report generated by rcov:
    http://eigenclass.org/static/rcov-sample-report-crossref/

This release is the first to include RubyGems packages: both a binary
one for
Win32 and a platform-independent one for all those with a compiler, (or
a lot
of patience, if willing to run rcov in pure-Ruby mode), so
  gem install rcov
should work.

Overview
========
rcov is a code coverage tool for Ruby. It is commonly used for viewing
overall
test coverage of target code. It features:
* fast execution: 20-300 times faster than previous tools
* multiple analysis modes: standard, bogo-profile, "intentional
testing",
  dependency analysis...
* fairly accurate coverage information through code linkage inference
using
  simple heuristics
* cross-referenced XHTML and several kinds of text reports
* support for easy automation with Rake and Rant
* colorblind-friendliness

What's new in 0.5.0
===================
See http://eigenclass.org/hiki.rb?rcov+0.5.0 for the detailed change
summary.

The big feature introduced in this release is the ability to generate
cross-referenced reports showing where methods are called from. This
should
prove useful when you're attempting to optimize your program, or even
when
just trying to understand what is going on. You can view a sample report
at

  http://eigenclass.org/static/rcov-sample-report-crossref/

As usual, there are also some improvements in the heuristics (many
multi-line
quoted strings work now), a few additional features, more polishing of
the
existing ones and a bunch of bugfixes.

Downloading
===========
The last version is available at
  http://eigenclass.org/hiki.rb?rcov

How do I use it?
================
In the common scenario, your tests are under test/ and the target code
(whose coverage you want) is in lib/. In that case, all you have to do
is
use rcov to run the tests (instead of testrb), and a number of XHTML
files
with the code coverage information will be generated, e.g.

    rcov -Ilib test/*.rb

will execute all the .rb files under test/ and generate the code
coverage
report for the target code (i.e. for the files in lib/) under coverage/.
The
target code needs not be under lib/; rcov will detect is as long as it
is
require()d by the tests. rcov is smart enough to ignore "uninteresting"
files: the tests themselves, files installed in Ruby's standard
locations,
etc.  See  rcov --help  for the list of regexps rcov matches filenames
against.

rcov can also be used from Rake or Rant; see README.{rake,rant} or the
RDoc
documentation for more information.

rcov can output information in several formats, and perform different
kinds
of analyses in addition to plain code coverage.  See  rcov --help  for a
description of the available options.

Sample output
=============
See http://eigenclass.org/hiki.rb?rcov (once again) for screenshots.

The text report (also used by default in RcovTasks) resembles

+-----------------------------------------------------+-------+-------+--------+
|                  File                               | Lines |  LOC  |  COV   |
+-----------------------------------------------------+-------+-------+--------+
|lib/rcov.rb                                          |   572 |   358 |  91.3% |
+-----------------------------------------------------+-------+-------+--------+
|Total                                                |   572 |   358 |  91.3% |
+-----------------------------------------------------+-------+-------+--------+
91.3%   1 file(s)   572 Lines   358 LOC

The (undecorated) textual output with execution count information looks
like this:

 $ rcov --no-html --text-counts b.rb
 ================================================================================
 ./b.rb
 ================================================================================
                                                                       |
2
 a, b, c = (1..3).to_a                                                 |
2
 10.times do                                                           |
1
   a += 1                                                              |
10
   20.times do |i|                                                     |
10
     b += i                                                            |
200
     b.times do                                                        |
200
       c += (j = (b-a).abs) > 0 ? j : 0                                |
738800
     end                                                               |
0
   end                                                                 |
0
 end                                                                   |
0


License
-------
rcov is released under the terms of Ruby's license.
rcov includes xx 0.1.0, which is subject to the following conditions:

ePark Labs Public License version 1
Copyright (c) 2005, ePark Labs, Inc. and contributors
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification,
are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright
notice, this
     list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
notice,
     this list of conditions and the following disclaimer in the
documentation
     and/or other materials provided with the distribution.
  3. Neither the name of ePark Labs nor the names of its contributors
may be
     used to endorse or promote products derived from this software
without
     specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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