travis: run rake tests in isolation

Author: palkan

.travis.yml

@@ -8,6 +8,9 @@ before_install:
   - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
   - gem install bundler -v '< 2'
 
+script:
+  - bundle exec rake test:ci
+
 matrix:
   fast_finish: true
   include:

Rakefile

@@ -15,4 +15,14 @@ Rake::TestTask.new(:test) do |t|
   t.test_files = FileList["test/**/*_test.rb"]
 end
 
+namespace :test do
+  task :isolated do
+    Dir.glob("test/**/*_test.rb").all? do |file|
+      sh(Gem.ruby, "-w", "-Ilib:test", file)
+    end || raise("Failures")
+  end
+
+  task ci: %w[rubocop test:isolated spec]
+end
+
 task default: [:rubocop, :test, :spec]