Look, it works.

Author: sj26

.buildkite/pipeline.yml

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+steps:
+  - command: bundle exec rake
+    env:
+      BUNDLE_AUTO_INSTALL: true

.gitignore

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+/.bundle/
+/.yardoc
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/
+
+# rspec failure tracking
+.rspec_status

.rspec

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+--format documentation
+--color
+--format RSpec::Buildkite::AnnotationFormatter
+--require spec_helper

.travis.yml

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+sudo: false
+language: ruby
+rvm:
+- 2.1
+- 2.2
+- 2.3
+- 2.3
+- 2.5
+gemfile:
+- gemfiles/rspec_3_0.gemfile
+- gemfiles/rspec_3_1.gemfile
+- gemfiles/rspec_3_2.gemfile
+- gemfiles/rspec_3_3.gemfile
+- gemfiles/rspec_3_4.gemfile
+- gemfiles/rspec_3_5.gemfile
+- gemfiles/rspec_3_6.gemfile
+- gemfiles/rspec_3_7.gemfile

Appraisals

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+appraise "rspec-3-0" do
+  gem "rspec", "~> 3.0.0"
+end
+
+appraise "rspec-3-1" do
+  gem "rspec", "~> 3.1.0"
+end
+
+appraise "rspec-3-2" do
+  gem "rspec", "~> 3.2.0"
+end
+
+appraise "rspec-3-3" do
+  gem "rspec", "~> 3.3.0"
+end
+
+appraise "rspec-3-4" do
+  gem "rspec", "~> 3.4.0"
+end
+
+appraise "rspec-3-5" do
+  gem "rspec", "~> 3.5.0"
+end
+
+appraise "rspec-3-6" do
+  gem "rspec", "~> 3.6.0"
+end
+
+appraise "rspec-3-7" do
+  gem "rspec", "~> 3.7.0"
+end

Gemfile

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+source "https://rubygems.org"
+
+git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+
+# Specify your gem's dependencies in rspec-buildkite.gemspec
+gemspec

Gemfile.lock

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+PATH
+  remote: .
+  specs:
+    rspec-buildkite (0.1.0)
+      rspec-core (~> 3.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    appraisal (2.2.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    coderay (1.1.2)
+    diff-lcs (1.3)
+    rake (12.3.1)
+    rspec (3.7.0)
+      rspec-core (~> 3.7.0)
+      rspec-expectations (~> 3.7.0)
+      rspec-mocks (~> 3.7.0)
+    rspec-core (3.7.1)
+      rspec-support (~> 3.7.0)
+    rspec-expectations (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.1)
+    thor (0.20.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  appraisal
+  bundler (~> 1.16)
+  coderay
+  rake
+  rspec (~> 3.0)
+  rspec-buildkite!
+
+BUNDLED WITH
+   1.16.2

LICENSE.txt

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+The MIT License (MIT)
+
+Copyright (c) 2018 Samuel Cochran
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# RSpec Buildkite
+
+Output [RSpec][rspec] failure messages as [Buildkite annotations][buildkite-annotations] as soon as they happen so you can fix them while your build finishes.
+
+![A Buildkite build still in progress with an annotation showing an RSpec failure][screenshot]
+
+  [rspec]: http://rspec.info
+  [buildkite-annotations]: https://buildkite.com/docs/agent/v3/cli-annotate
+  [screenshot]: https://user-images.githubusercontent.com/14028/40577709-5b839e8a-614d-11e8-898b-575bb0cc02ba.png
+
+## Installation
+
+Add the gem to your Gemfile, after rspec:
+
+```ruby
+gem "rspec"
+gem "rspec-buildkite"
+```
+
+And then bundle:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install rspec-buildkite
+
+## Usage
+
+Add it to your `.rspec` alongside your favorite formatter:
+
+```
+--color
+--require spec_helper
+--format documentation
+--format RSpec::Buildkite::AnnotationFormatter
+```
+
+Now run your specs on Buildkite!
+
+## Development
+
+After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+
+To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/sj26/rspec-buildkite.
+
+## License
+
+The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).

Rakefile

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+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+require "appraisal"
+
+RSpec::Core::RakeTask.new(:spec)
+
+task :default => :spec
+
+if !ENV["APPRAISAL_INITIALIZED"] && !ENV["TRAVIS"]
+  task :default => :appraisal
+end