From: Diana Jaunzeikare <rozziite@...>
Date: 2009-06-30T00:53:36+09:00
Subject: How to interrupt unit tests if a library is not present.

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Hi all,

I am developing support for PhyloXML in BioRuby as Google Summer of Code
project. I have a question about unit testing.

My code depends on libxml-ruby library (other parts of BioRuby does not). So
I want to test if libxml-ruby is required and then if it is not, i want to
quit my unit test suite (a file tes_phyloxml.rb) nicely (don't perform any
unit tests related to phyloxml since they anyways gonna fail) but the rest
of unit test suites should continue running.

Right now the it completely exits, if can't load xml library, but I would
like the other tests to continue running.

#First let's test if xml library is here, since it will be required by
bio/db/phyloxml
begin
  require 'xml'
rescue LoadError
  puts "Please install libxml-ruby library. It is needed for Bio::PhyloXML
module. Unit tests will exit now.
  exit 1
end

require 'bio/db/phyloxml'


class TestPhyloXML1 < Test::Unit::TestCase

     def setup
      @phyloxml = Bio::PhyloXML.new(TestPhyloXMLData.example_xml)
    end

    def test_init
      assert_equal(@phyloxml.class, Bio::PhyloXML)
    end

   #[...]

end


Thanks,

Diana

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