Refactor specs

- Create `spec_helper` and `.rspec`
- Add `spec/examples.txt` to `.gitignore` and sort alphabetically.
  `spec/examples.txt` allows to run specs with `--only-failures` option
- Add SimpleCov for code coverage. Run specs with `COVERAGE` env
  variable set to any value

.gitignore

@@ -2,17 +2,18 @@
 *.rbc
 .bundle
 .config
+.ruby-*
 .yardoc
-Gemfile.lock
-InstalledFiles
-_yardoc
 coverage
 doc/
+Gemfile.lock
+InstalledFiles
 lib/bundler/man
 pkg
 rdoc
+spec/examples.txt
 spec/reports
 test/tmp
 test/version_tmp
 tmp
-.ruby-*
+_yardoc

.rspec

@@ -0,0 +1 @@
+--require spec_helper

Gemfile

@@ -15,3 +15,5 @@ gem "rubocop-packaging", "0.5.2", require: false
 gem "rubocop-performance", "1.23.0", require: false
 gem "rubocop-rake", "0.6.0", require: false
 gem "rubocop-rspec", "3.3.0", require: false
+
+gem "simplecov", require: false

spec/asset_file_spec.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
-require "inline_svg/finds_asset_paths"
-require "inline_svg/asset_file"
+require 'spec_helper'
 
 RSpec.describe InlineSvg::AssetFile do
   it "reads data from a file, after qualifying a full path" do

spec/cached_asset_file_spec.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
-require 'pathname'
-require "inline_svg"
+require 'spec_helper'
 
 RSpec.describe InlineSvg::CachedAssetFile do
   let(:fixture_path) { Pathname.new(File.expand_path('files/static_assets', __dir__)) }

spec/finds_asset_paths_spec.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
-require 'pathname'
-require "inline_svg"
+require 'spec_helper'
 
 RSpec.describe InlineSvg::FindsAssetPaths do
   after do

spec/helpers/inline_svg_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg'
+require 'spec_helper'
 
 class WorkingCustomTransform < InlineSvg::CustomTransformation
   def transform(doc)

spec/id_generator_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "inline_svg/id_generator"
+require 'spec_helper'
 
 RSpec.describe InlineSvg::IdGenerator do
   it "generates a hexencoded ID based on a salt and a random value" do

spec/inline_svg_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "inline_svg"
+require 'spec_helper'
 
 class MyCustomTransform
   def self.create_with_value(value); end

spec/io_resource_spec.rb

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
-require "inline_svg"
-require "stringio"
-require "tempfile"
+require 'tempfile'
+
+require 'spec_helper'
 
 RSpec.describe InlineSvg::IOResource do
   it "support api methods" do

spec/propshaft_asset_finder_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "inline_svg"
+require 'spec_helper'
 
 RSpec.describe InlineSvg::PropshaftAssetFinder do
   context "when the file is not found" do

spec/spec_helper.rb

@@ -0,0 +1,106 @@
+# frozen_string_literal: true
+
+if ENV.fetch('COVERAGE', false)
+  require 'simplecov'
+
+  SimpleCov.start do
+    add_filter %r{^/spec/}
+  end
+end
+
+require 'inline_svg'
+
+# This file was generated by the `rspec --init` command. Conventionally, all
+# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
+# The generated `.rspec` file contains `--require spec_helper` which will cause
+# this file to always be loaded, without a need to explicitly require it in any
+# files.
+#
+# Given that it is always loaded, you are encouraged to keep this file as
+# light-weight as possible. Requiring heavyweight dependencies from this file
+# will add to the boot time of your test suite on EVERY test run, even for an
+# individual file that may not need all of that loaded. Instead, consider making
+# a separate helper file that requires the additional dependencies and performs
+# the additional setup, and require it from the spec files that actually need
+# it.
+#
+# See https://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+RSpec.configure do |config|
+  # rspec-expectations config goes here. You can use an alternate
+  # assertion/expectation library such as wrong or the stdlib/minitest
+  # assertions if you prefer.
+  config.expect_with :rspec do |expectations|
+    # This option will default to `true` in RSpec 4. It makes the `description`
+    # and `failure_message` of custom matchers include text for helper methods
+    # defined using `chain`, e.g.:
+    #     be_bigger_than(2).and_smaller_than(4).description
+    #     # => "be bigger than 2 and smaller than 4"
+    # ...rather than:
+    #     # => "be bigger than 2"
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  # rspec-mocks config goes here. You can use an alternate test double
+  # library (such as bogus or mocha) by changing the `mock_with` option here.
+  config.mock_with :rspec do |mocks|
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object. This is generally recommended, and will default to
+    # `true` in RSpec 4.
+    mocks.verify_partial_doubles = true
+  end
+
+  # This option will default to `:apply_to_host_groups` in RSpec 4 (and will
+  # have no way to turn it off -- the option exists only for backwards
+  # compatibility in RSpec 3). It causes shared context metadata to be
+  # inherited by the metadata hash of host groups and examples, rather than
+  # triggering implicit auto-inclusion in groups with matching metadata.
+  config.shared_context_metadata_behavior = :apply_to_host_groups
+
+  # This allows you to limit a spec run to individual examples or groups
+  # you care about by tagging them with `:focus` metadata. When nothing
+  # is tagged with `:focus`, all examples get run. RSpec also provides
+  # aliases for `it`, `describe`, and `context` that include `:focus`
+  # metadata: `fit`, `fdescribe` and `fcontext`, respectively.
+  config.filter_run_when_matching :focus
+
+  # Allows RSpec to persist some state between runs in order to support
+  # the `--only-failures` and `--next-failure` CLI options. We recommend
+  # you configure your source control system to ignore this file.
+  config.example_status_persistence_file_path = "spec/examples.txt"
+
+  # Limits the available syntax to the non-monkey patched syntax that is
+  # recommended. For more details, see:
+  # https://rspec.info/features/3-12/rspec-core/configuration/zero-monkey-patching-mode/
+  config.disable_monkey_patching!
+
+  # This setting enables warnings. It's recommended, but in some cases may
+  # be too noisy due to issues in dependencies.
+  config.warnings = true
+
+  # Many RSpec users commonly either run the entire suite or an individual
+  # file, and it's useful to allow more verbose output when running an
+  # individual spec file.
+  if config.files_to_run.one?
+    # Use the documentation formatter for detailed output,
+    # unless a formatter has already been configured
+    # (e.g. via a command-line flag).
+    config.default_formatter = "doc"
+  end
+
+  # Print the 10 slowest examples and example groups at the
+  # end of the spec run, to help surface which specs are running
+  # particularly slow.
+  config.profile_examples = 10
+
+  # Run specs in random order to surface order dependencies. If you find an
+  # order dependency and want to debug it, you can fix the order by providing
+  # the seed, which is printed after each run.
+  #     --seed 1234
+  config.order = :random
+
+  # Seed global randomization in this process using the `--seed` CLI option.
+  # Setting this allows you to use `--seed` to deterministically reproduce
+  # test failures related to randomization by passing the same `--seed` value
+  # as the one that triggered the failure.
+  Kernel.srand config.seed
+end

spec/static_asset_finder_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "inline_svg"
+require 'spec_helper'
 
 RSpec.describe InlineSvg::StaticAssetFinder do
   context "when the file is not found" do

spec/transformation_pipeline/transformations/aria_attributes_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "inline_svg/transform_pipeline"
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::AriaAttributes do
   it "adds a role attribute to the SVG document" do

spec/transformation_pipeline/transformations/aria_hidden_attribute_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::AriaHiddenAttribute do
   it "adds an aria-hidden='true' attribute to a SVG document" do

spec/transformation_pipeline/transformations/class_attribute_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "inline_svg/transform_pipeline"
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::ClassAttribute do
   it "adds a class attribute to a SVG document" do

spec/transformation_pipeline/transformations/data_attributes_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::DataAttributes do
   it "adds a data attribute to a SVG document" do

spec/transformation_pipeline/transformations/description_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::Description do
   it "adds a desc element to the SVG document" do

spec/transformation_pipeline/transformations/height_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::Height do
   it "adds height attribute to a SVG document" do

spec/transformation_pipeline/transformations/id_attribute_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::IdAttribute do
   it "adds an id attribute to a SVG document" do

spec/transformation_pipeline/transformations/preserve_aspect_ratio_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::PreserveAspectRatio do
   it "adds preserveAspectRatio attribute to a SVG document" do

spec/transformation_pipeline/transformations/size_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::Size do
   it "adds width and height attributes to a SVG document" do

spec/transformation_pipeline/transformations/style_attribute_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "inline_svg/transform_pipeline"
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::ClassAttribute do
   it "adds a style attribute to a SVG document" do

spec/transformation_pipeline/transformations/title_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::Title do
   it "adds a title element as the first element in the SVG document" do

spec/transformation_pipeline/transformations/transformation_spec.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg'
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::Transformation do
   describe "#with_svg" do

spec/transformation_pipeline/transformations/view_box_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::ViewBox do
   it "adds viewBox attribute to a SVG document" do

spec/transformation_pipeline/transformations/width_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 RSpec.describe InlineSvg::TransformPipeline::Transformations::Width do
   it "adds width attribute to a SVG document" do

spec/transformation_pipeline/transformations_spec.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
-require 'inline_svg'
-require 'inline_svg/transform_pipeline'
+require 'spec_helper'
 
 class ACustomTransform < InlineSvg::CustomTransformation
   def transform(doc)

spec/webpack_asset_finder_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "inline_svg"
+require 'spec_helper'
 
 RSpec.describe InlineSvg::WebpackAssetFinder do
   context "when the file is not found" do