Added rake tasks to generate rcov code coverage reports. rake -T test:coverage to...

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1744 e93f8b46-1217-0410-a6f0-8f06a7374b81

diff --git a/lib/tasks/testing.rake b/lib/tasks/testing.rake
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+++ b/lib/tasks/testing.rake
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+### From http://svn.geekdaily.org/public/rails/plugins/generally_useful/tasks/coverage_via_rcov.rake
+
+### Inspired by http://blog.labratz.net/articles/2006/12/2/a-rake-task-for-rcov
+begin
+  require 'rcov/rcovtask'
+
+  namespace :test do 
+    desc "Aggregate code coverage for all tests"
+    Rcov::RcovTask.new('coverage') do |t|
+      t.libs << 'test'
+      t.test_files = FileList['test/{unit,integration,functional}/*_test.rb']
+      t.verbose = true
+      t.rcov_opts << '--rails --aggregate test/coverage.data'
+    end
+
+    namespace :coverage do
+      desc "Delete coverage test data"
+      task :clean do
+        rm_f "test/coverage.data"
+        rm_rf "test/coverage"
+      end
+
+      desc "Aggregate code coverage for all tests with HTML output"
+      Rcov::RcovTask.new('html') do |t|
+        t.libs << 'test'
+        t.test_files = FileList['test/{unit,integration,functional}/*_test.rb']
+        t.output_dir = "test/coverage"
+        t.verbose = true
+        t.rcov_opts << '--rails --aggregate test/coverage.data'
+      end
+    
+      desc "Open the HTML coverage report"
+      task :show_results do
+        system "open test/coverage/index.html"
+      end
+
+      task :full => "test:coverage:clean"
+      task :full => "test:coverage:html"
+      task :full => "test:coverage:show_results"
+    end
+  end
+rescue LoadError
+  puts 'Rcov is not available. Proceeding without...'
+end