333 lines
9.6 KiB
Ruby
333 lines
9.6 KiB
Ruby
require 'morpher'
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require 'anima'
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require 'mutant'
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# @api private
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module MutantSpec
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ROOT = Pathname.new(__FILE__).parent.parent.parent
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# Namespace module for corpus testing
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#
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# rubocop:disable MethodLength
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module Corpus
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TMP = ROOT.join('tmp').freeze
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EXCLUDE_GLOB_FORMAT = '{%s}'.freeze
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# Not in the docs. Number from chatting with their support.
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# 2 processors allocated per container, 4 processes works well.
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CIRCLE_CI_CONTAINER_PROCESSES = 4
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private_constant(*constants(false))
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# Project under corpus test
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# rubocop:disable ClassLength
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class Project
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MUTEX = Mutex.new
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MUTATION_GENERATION_MESSAGE = 'Total Mutations/Time/Parse-Errors: %s/%0.2fs - %0.2f/s'.freeze
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START_MESSAGE = 'Starting - %s'.freeze
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FINISH_MESSAGE = 'Mutations - %4i - %s'.freeze
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DEFAULT_MUTATION_COUNT = 0
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include Adamantium, Anima.new(
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:expected_errors,
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:mutation_coverage,
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:mutation_generation,
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:name,
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:namespace,
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:repo_uri,
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:repo_ref,
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:ruby_glob_pattern,
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:exclude
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)
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# Verify mutation coverage
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#
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# @return [self]
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# if successful
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#
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# @raise [Exception]
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def verify_mutation_coverage
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checkout
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Dir.chdir(repo_path) do
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install_mutant
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system(
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%W[
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bundle exec mutant
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--use rspec
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--include lib
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--require #{name}
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#{namespace}*
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]
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)
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end
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end
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# Verify mutation generation
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#
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# @return [self]
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# if successful
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#
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# @raise [Exception]
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# otherwise
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def verify_mutation_generation
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checkout
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start = Time.now
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options = {
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finish: method(:finish),
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start: method(:start),
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in_processes: parallel_processes
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}
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total = Parallel.map(effective_ruby_paths, options, &method(:count_mutations_and_check_errors))
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.inject(DEFAULT_MUTATION_COUNT, :+)
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took = Time.now - start
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puts MUTATION_GENERATION_MESSAGE % [total, took, total / took]
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self
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end
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# Checkout repository
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#
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# @return [self]
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def checkout
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return self if noinstall?
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TMP.mkdir unless TMP.directory?
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if repo_path.exist?
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Dir.chdir(repo_path) do
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system(%w[git fetch origin])
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system(%w[git reset --hard])
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system(%w[git clean -f -d -x])
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end
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else
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system(%W[git clone #{repo_uri} #{repo_path}])
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end
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Dir.chdir(repo_path) do
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system(%W[git checkout #{repo_ref}])
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system(%w[git reset --hard])
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system(%w[git clean -f -d -x])
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end
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self
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end
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memoize :checkout
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private
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# Count mutations and check error results against whitelist
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#
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# @param path [Pathname] path responsible for exception
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#
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# @return [Integer] mutations generated
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def count_mutations_and_check_errors(path)
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relative_path = path.relative_path_from(repo_path)
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count = count_mutations(path)
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expected_errors.assert_success(relative_path)
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count
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rescue Exception => exception # rubocop:disable Lint/RescueException
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expected_errors.assert_error(relative_path, exception)
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DEFAULT_MUTATION_COUNT
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end
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# Count mutations generated for provided source file
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#
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# @param path [Pathname] path to a source file
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#
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# @raise [Exception] any error specified by integrations.yml
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#
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# @return [Integer] number of mutations generated
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def count_mutations(path)
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node = Parser::CurrentRuby.parse(path.read)
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return DEFAULT_MUTATION_COUNT unless node
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Mutant::Mutator.mutate(node).length
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end
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# Install mutant
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#
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# @return [undefined]
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def install_mutant
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return if noinstall?
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relative = ROOT.relative_path_from(repo_path)
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repo_path.join('Gemfile').open('a') do |file|
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file << "gem 'mutant', path: '#{relative}'\n"
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file << "gem 'mutant-rspec', path: '#{relative}'\n"
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file << "eval_gemfile File.expand_path('#{relative.join('Gemfile.shared')}')\n"
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end
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lockfile = repo_path.join('Gemfile.lock')
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lockfile.delete if lockfile.exist?
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system(%w[bundle])
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end
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# The effective ruby file paths
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#
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# @return [Array<Pathname>]
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def effective_ruby_paths
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Pathname
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.glob(repo_path.join(ruby_glob_pattern))
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.sort_by(&:size)
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.reverse
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.reject { |path| exclude.include?(path.relative_path_from(repo_path).to_s) }
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end
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# Number of parallel processes to use
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#
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# @return [Integer]
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def parallel_processes
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if ENV.key?('CI')
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CIRCLE_CI_CONTAINER_PROCESSES
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else
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Parallel.processor_count
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end
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end
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# Repository path
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#
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# @return [Pathname]
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def repo_path
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TMP.join(name)
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end
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# Test if installation should be skipped
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#
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# @return [Boolean]
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def noinstall?
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ENV.key?('NOINSTALL')
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end
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# Print start progress
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#
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# @param [Pathname] path
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# @param [Integer] _index
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#
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# @return [undefined]
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#
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def start(path, _index)
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MUTEX.synchronize do
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puts START_MESSAGE % path
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end
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end
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# Print finish progress
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#
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# @param [Pathname] path
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# @param [Integer] _index
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# @param [Integer] count
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#
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# @return [undefined]
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#
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def finish(path, _index, count)
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MUTEX.synchronize do
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puts FINISH_MESSAGE % [count, path]
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end
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end
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# Helper method to execute system commands
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#
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# @param [Array<String>] arguments
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#
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# rubocop:disable GuardClause - guard clause without else does not make sense
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def system(arguments)
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return if Kernel.system(*arguments)
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if block_given?
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yield
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else
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fail "System command failed!: #{arguments.join(' ')}"
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end
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end
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# Mapping of files which we expect to cause errors during mutation generation
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class ErrorWhitelist
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class UnnecessaryExpectation < StandardError
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MESSAGE = 'Expected to encounter %s while mutating "%s"'.freeze
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def initialize(*error_info)
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super(MESSAGE % error_info)
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end
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end # UnnecessaryExpectation
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include Concord.new(:map), Adamantium
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# Assert that we expect to encounter the provided exception for this path
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#
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# @param path [Pathname]
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# @param exception [Exception]
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#
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# @raise provided exception if we are not expecting this error
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#
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# This method is reraising exceptions but rubocop can't tell
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# rubocop:disable Style/SignalException
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#
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# @return [undefined]
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def assert_error(path, exception)
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original_error = exception.cause || exception
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raise exception unless map.fetch(original_error.inspect, []).include?(path)
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end
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# Assert that we expect to not encounter an error for the specified path
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#
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# @param path [Pathname]
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#
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# @raise [UnnecessaryExpectation] if we are expecting an exception for this path
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#
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# @return [undefined]
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def assert_success(path)
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map.each do |error, paths|
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fail UnnecessaryExpectation.new(error, path) if paths.include?(path)
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end
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end
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# Return representation as hash
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#
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# @note this method is necessary for morpher loader to be invertible
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#
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# @return [Hash{Pathname => String}]
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def to_h
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map
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end
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end # ErrorWhitelist
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LOADER = Morpher.build do
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s(:block,
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s(:guard, s(:primitive, Array)),
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s(:map,
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s(:block,
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s(:guard, s(:primitive, Hash)),
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s(:hash_transform,
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s(:key_symbolize, :repo_uri, s(:guard, s(:primitive, String))),
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s(:key_symbolize, :repo_ref, s(:guard, s(:primitive, String))),
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s(:key_symbolize, :ruby_glob_pattern, s(:guard, s(:primitive, String))),
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s(:key_symbolize, :name, s(:guard, s(:primitive, String))),
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s(:key_symbolize, :namespace, s(:guard, s(:primitive, String))),
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s(:key_symbolize, :mutation_coverage,
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s(:guard, s(:or, s(:primitive, TrueClass), s(:primitive, FalseClass)))),
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s(:key_symbolize, :mutation_generation,
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s(:guard, s(:or, s(:primitive, TrueClass), s(:primitive, FalseClass)))),
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s(:key_symbolize, :expected_errors,
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s(:block,
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s(:guard, s(:primitive, Hash)),
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s(:custom,
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[
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->(hash) { hash.map { |key, values| [key, values.map(&Pathname.method(:new))] }.to_h },
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->(hash) { hash.map { |key, values| [key, values.map(&:to_s)] }.to_h }
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]),
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s(:load_attribute_hash, s(:param, ErrorWhitelist)))),
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s(:key_symbolize, :exclude, s(:map, s(:guard, s(:primitive, String))))),
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s(:anima_load, Project))))
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end
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ALL = LOADER.call(YAML.load_file(ROOT.join('spec', 'integrations.yml')))
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end # Project
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end # Corpus
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end # MutantSpec
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