path: root/activesupport/lib/active_support/test_case.rb

# frozen_string_literal: true

gem "minitest" # make sure we get the gem, not stdlib
require "minitest"
require "active_support/testing/tagged_logging"
require "active_support/testing/setup_and_teardown"
require "active_support/testing/assertions"
require "active_support/testing/deprecation"
require "active_support/testing/declarative"
require "active_support/testing/isolation"
require "active_support/testing/constant_lookup"
require "active_support/testing/time_helpers"
require "active_support/testing/file_fixtures"
require "active_support/testing/parallelization"

module ActiveSupport
  class TestCase < ::Minitest::Test
    Assertion = Minitest::Assertion

    class << self
      # Sets the order in which test cases are run.
      #
      #   ActiveSupport::TestCase.test_order = :random # => :random
      #
      # Valid values are:
      # * +:random+   (to run tests in random order)
      # * +:parallel+ (to run tests in parallel)
      # * +:sorted+   (to run tests alphabetically by method name)
      # * +:alpha+    (equivalent to +:sorted+)
      def test_order=(new_order)
        ActiveSupport.test_order = new_order
      end

      # Returns the order in which test cases are run.
      #
      #   ActiveSupport::TestCase.test_order # => :random
      #
      # Possible values are +:random+, +:parallel+, +:alpha+, +:sorted+.
      # Defaults to +:random+.
      def test_order
        ActiveSupport.test_order ||= :random
      end

      # Parallelizes the test suite.
      #
      # Takes a `workers` argument that controls how many times the process
      # is forked. For each process a new database will be created suffixed
      # with the worker number.
      #
      #   test-database-0
      #   test-database-1
      #
      # If `ENV["PARALLEL_WORKERS"]` is set the workers argument will be ignored
      # and the environment variable will be used instead. This is useful for CI
      # environments, or other environments where you may need more workers than
      # you do for local testing.
      #
      # If the number of workers is set to `1` or fewer, the tests will not be
      # parallelized.
      #
      # The default parallelization method is to fork processes. If you'd like to
      # use threads instead you can pass `with: :threads` to the `parallelize`
      # method. Note the threaded parallelization does not create multiple
      # database and will not work with system tests at this time.
      #
      #   parallelize(workers: 2, with: :threads)
      #
      # The threaded parallelization uses Minitest's parallel exector directly.
      # The processes paralleliztion uses a Ruby Drb server.
      def parallelize(workers: 2, with: :processes)
        workers = ENV["PARALLEL_WORKERS"].to_i if ENV["PARALLEL_WORKERS"]

        return if workers <= 1

        executor = case with
                   when :processes
                     Testing::Parallelization.new(workers)
                   when :threads
                     Minitest::Parallel::Executor.new(workers)
                   else
                     raise ArgumentError, "#{with} is not a supported parallelization exectutor."
        end

        self.lock_threads = false if defined?(self.lock_threads) && with == :threads

        Minitest.parallel_executor = executor

        parallelize_me!
      end

      # Set up hook for parallel testing. This can be used if you have multiple
      # databases or any behavior that needs to be run after the process is forked
      # but before the tests run.
      #
      # Note: this feature is not available with the threaded parallelization.
      #
      # In your +test_helper.rb+ add the following:
      #
      #   class ActiveSupport::TestCase
      #     parallelize_setup do
      #       # create databases
      #     end
      #   end
      def parallelize_setup(&block)
        ActiveSupport::Testing::Parallelization.after_fork_hook do |worker|
          yield worker
        end
      end

      # Clean up hook for parallel testing. This can be used to drop databases
      # if your app uses multiple write/read databases or other clean up before
      # the tests finish. This runs before the forked process is closed.
      #
      # Note: this feature is not available with the threaded parallelization.
      #
      # In your +test_helper.rb+ add the following:
      #
      #   class ActiveSupport::TestCase
      #     parallelize_teardown do
      #       # drop databases
      #     end
      #   end
      def parallelize_teardown(&block)
        ActiveSupport::Testing::Parallelization.run_cleanup_hook do |worker|
          yield worker
        end
      end
    end

    alias_method :method_name, :name

    include ActiveSupport::Testing::TaggedLogging
    include ActiveSupport::Testing::SetupAndTeardown
    include ActiveSupport::Testing::Assertions
    include ActiveSupport::Testing::Deprecation
    include ActiveSupport::Testing::TimeHelpers
    include ActiveSupport::Testing::FileFixtures
    extend ActiveSupport::Testing::Declarative

    # test/unit backwards compatibility methods
    alias :assert_raise :assert_raises
    alias :assert_not_empty :refute_empty
    alias :assert_not_equal :refute_equal
    alias :assert_not_in_delta :refute_in_delta
    alias :assert_not_in_epsilon :refute_in_epsilon
    alias :assert_not_includes :refute_includes
    alias :assert_not_instance_of :refute_instance_of
    alias :assert_not_kind_of :refute_kind_of
    alias :assert_no_match :refute_match
    alias :assert_not_nil :refute_nil
    alias :assert_not_operator :refute_operator
    alias :assert_not_predicate :refute_predicate
    alias :assert_not_respond_to :refute_respond_to
    alias :assert_not_same :refute_same

    ActiveSupport.run_load_hooks(:active_support_test_case, self)
  end
end