feat!: Implement blank_gem that does nothing.

.gitignore

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

.versionrc.js

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+module.exports = config = {};
+
+config.bumpFiles = [
+  {
+    filename: "VERSION",
+    type: "plain-text"
+  }
+];

Gemfile

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+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in blank_gem.gemspec
+gemspec
+
+gem 'rake'

LICENSE

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+MIT License
+
+Copyright (c) 2020 Jim Myhrberg
+
+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.

Makefile

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+.PHONY: new-version
+new-version:
+	$(if $(shell command -v npx),, \
+		$(error No npx executable in PATH, please install NodeJS))
+	$(if $(shell command -v standard-version),, \
+		$(error No standard-version executable in PATH, \
+			install with: npm i -g standard-version))
+
+	npx standard-version

README.md

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+# BlankGem
+
+A blank/empty Ruby gem that does nothing. Useful for testing that only specific
+Bundler groups are loaded when using a dummy group.
+
+## Installation
+
+Add this line to your application's Gemfile, ideally under a group you'll never
+want:
+
+```ruby
+gem 'blank_gem', group: :never
+```
+
+And then execute:
+
+    $ bundle install
+
+## Usage
+
+Simply set Bundler's `without` option to exclude the group you've put the
+`blank_gem` within. For example:
+
+    $ bundle config set without 'never'
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at
+https://github.com/jimeh/blank_gem.

Rakefile

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+# frozen_string_literal: true
+
+require 'bundler/gem_tasks'

VERSION

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+0.0.1

blank_gem.gemspec

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+# frozen_string_literal: true
+
+require_relative 'lib/blank_gem/version'
+
+Gem::Specification.new do |spec|
+  spec.name = 'blank_gem'
+  spec.version = BlankGem::VERSION
+  spec.authors = ['Jim Myhrberg']
+  spec.email = ['contact@jimeh.me']
+
+  spec.summary = 'A blank/empty Ruby gem that does nothing.'
+  spec.description = 'A blank/empty Ruby gem that does nothing. Useful for ' \
+                     'testing that only specific Bundler groups are loaded ' \
+                     'when using a dummy group.'
+  spec.homepage = 'https://github.com/jimeh/blank_gem'
+  spec.required_ruby_version = Gem::Requirement.new('>= 2.0.0')
+
+  spec.metadata['homepage_uri'] = spec.homepage
+  spec.metadata['source_code_uri'] = spec.homepage
+  spec.metadata['changelog_uri'] = spec.homepage
+
+  spec.files = Dir.glob('lib/**/*') + [
+    'Gemfile',
+    'LICENSE',
+    'README.md',
+    'Rakefile',
+    'VERSION'
+  ]
+  spec.bindir = 'exe'
+  spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.require_paths = ['lib']
+end

lib/blank_gem.rb

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+# frozen_string_literal: true
+
+require 'blank_gem/version'
+
+module BlankGem; end

lib/blank_gem/version.rb

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+# frozen_string_literal: true
+
+module BlankGem
+  VERSION = File.read(
+    File.expand_path(File.join('..', '..', 'VERSION'), __dir__)
+  )
+end