Create helpers.rb

lib/parallel_tests/tasks/helpers.rb

@@ -0,0 +1,158 @@
+module ParallelTests
+  module Tasks
+    module Helpers
+      class << self
+        def rails_env
+          'test'
+        end
+
+        def load_lib
+          $LOAD_PATH << File.expand_path('..', __dir__)
+          require "parallel_tests"
+        end
+
+        def purge_before_load
+          if Gem::Version.new(Rails.version) > Gem::Version.new('4.2.0')
+            Rake::Task.task_defined?('db:purge') ? 'db:purge' : 'app:db:purge'
+          end
+        end
+
+        def run_in_parallel(cmd, options = {})
+          load_lib
+
+          # Using the relative path to find the binary allow to run a specific version of it
+          executable = File.expand_path('../../bin/parallel_test', __dir__)
+          command = ParallelTests.with_ruby_binary(executable)
+          command += ['--exec', Shellwords.join(cmd)]
+          command += ['-n', options[:count]] unless options[:count].to_s.empty?
+          command << '--non-parallel' if options[:non_parallel]
+
+          abort unless system(*command)
+        end
+
+        # this is a crazy-complex solution for a very simple problem:
+        # removing certain lines from the output without changing the exit-status
+        # normally I'd not do this, but it has been lots of fun and a great learning experience :)
+        #
+        # - sed does not support | without -r
+        # - grep changes 0 exitstatus to 1 if nothing matches
+        # - sed changes 1 exitstatus to 0
+        # - pipefail makes pipe fail with exitstatus of first failed command
+        # - pipefail is not supported in (zsh)
+        # - defining a new rake task like silence_schema would force users to load parallel_tests in test env
+        # - simple system "set -o pipefail" returns nil even though set -o pipefail exists with 0
+        def suppress_output(command, ignore_regex)
+          activate_pipefail = "set -o pipefail"
+          remove_ignored_lines = %{(grep -v #{Shellwords.escape(ignore_regex)} || true)}
+
+          # remove nil values (ex: #purge_before_load returns nil)
+          command.compact!
+
+          if system('/bin/bash', '-c', "#{activate_pipefail} 2>/dev/null")
+            shell_command = "#{activate_pipefail} && (#{Shellwords.shelljoin(command)}) | #{remove_ignored_lines}"
+            ['/bin/bash', '-c', shell_command]
+          else
+            command
+          end
+        end
+
+        def suppress_schema_load_output(command)
+          suppress_output(command, "^   ->\\|^-- ")
+        end
+
+        def check_for_pending_migrations
+          ["db:abort_if_pending_migrations", "app:db:abort_if_pending_migrations"].each do |abort_migrations|
+            if Rake::Task.task_defined?(abort_migrations)
+              Rake::Task[abort_migrations].invoke
+              break
+            end
+          end
+        end
+
+        # parallel:spec[:count, :pattern, :options, :pass_through]
+        def parse_args(args)
+          # order as given by user
+          args = [args[:count], args[:pattern], args[:options], args[:pass_through]]
+
+          # count given or empty ?
+          # parallel:spec[2,models,options]
+          # parallel:spec[,models,options]
+          count = args.shift if args.first.to_s =~ /^\d*$/
+          num_processes = (count.to_s.empty? ? nil : Integer(count))
+          pattern = args.shift
+          options = args.shift
+          pass_through = args.shift
+
+          [num_processes, pattern, options, pass_through]
+        end
+
+        def schema_format_based_on_rails_version
+          if rails_7_or_greater?
+            ActiveRecord.schema_format
+          else
+            ActiveRecord::Base.schema_format
+          end
+        end
+
+        def schema_type_based_on_rails_version
+          if rails_61_or_greater? || schema_format_based_on_rails_version == :ruby
+            "schema"
+          else
+            "structure"
+          end
+        end
+
+        def build_run_command(type, args)
+          count, pattern, options, pass_through = parse_args(args)
+          test_framework = {
+            'spec' => 'rspec',
+            'test' => 'test',
+            'features' => 'cucumber',
+            'features-spinach' => 'spinach'
+          }.fetch(type)
+
+          type = 'features' if test_framework == 'spinach'
+
+          # Using the relative path to find the binary allow to run a specific version of it
+          executable = File.expand_path('../../bin/parallel_test', __dir__)
+          executable = ParallelTests.with_ruby_binary(executable)
+
+          command = [*executable, type, '--type', test_framework]
+          command += ['-n', count.to_s] if count
+          command += ['--pattern', pattern] if pattern
+          command += ['--test-options', options] if options
+          command += Shellwords.shellsplit pass_through if pass_through
+          command
+        end
+
+        def configured_databases
+          return [] unless defined?(ActiveRecord) && rails_61_or_greater?
+
+          @@configured_databases ||= ActiveRecord::Tasks::DatabaseTasks.setup_initial_database_yaml
+        end
+
+        def for_each_database(&block)
+          # Use nil to represent all databases
+          block&.call(nil)
+
+          # skip if not rails or old rails version
+          return if !defined?(ActiveRecord::Tasks::DatabaseTasks) || !ActiveRecord::Tasks::DatabaseTasks.respond_to?(:for_each)
+
+          ActiveRecord::Tasks::DatabaseTasks.for_each(configured_databases) do |name|
+            block&.call(name)
+          end
+        end
+
+        private
+
+        def rails_7_or_greater?
+          Gem::Version.new(Rails.version) >= Gem::Version.new('7.0')
+        end
+
+        def rails_61_or_greater?
+          Gem::Version.new(Rails.version) >= Gem::Version.new('6.1.0')
+        end
+      end
+    end
+  end
+end