Allow passing specific BUNDLE_GEMFILE from the main test:* Rake tasks

Author: karmi

Rakefile

@@ -61,7 +61,9 @@ namespace :test do
     Rake::Task['test:ci_reporter'].invoke if ENV['CI']
     subprojects.each do |project|
       puts '-'*80
-      sh "cd #{__current__.join(project)} && unset BUNDLE_GEMFILE && bundle exec rake test:integration"
+      sh "cd #{__current__.join(project)} && unset BUNDLE_GEMFILE &&" +
+         %Q| #{ ENV['TEST_BUNDLE_GEMFILE'] ? "BUNDLE_GEMFILE=#{ENV['TEST_BUNDLE_GEMFILE']}" : '' }|  +
+         " bundle exec rake test:integration"
       puts "\n"
     end
     Rake::Task['test:coveralls'].invoke if ENV['CI'] && defined?(RUBY_VERSION) && RUBY_VERSION > '1.9'
@@ -72,7 +74,9 @@ namespace :test do
     Rake::Task['test:ci_reporter'].invoke if ENV['CI']
     subprojects.each do |project|
       puts '-'*80
-      sh "cd #{__current__.join(project)} && unset BUNDLE_GEMFILE && bundle exec rake test:all"
+      sh "cd #{__current__.join(project)} && unset BUNDLE_GEMFILE &&" +
+         %Q| #{ ENV['TEST_BUNDLE_GEMFILE'] ? "BUNDLE_GEMFILE=#{ENV['TEST_BUNDLE_GEMFILE']}" : '' }|  +
+         " bundle exec rake test:all"
       puts "\n"
     end
   end