rails--rails/activesupport/test/isolation_test.rb

require 'abstract_unit'
require 'rbconfig'

if defined?(MiniTest) || defined?(Test::Unit::TestResultFailureSupport)
  $stderr.puts "Isolation tests can test test-unit 1 only"

else
  # Does awesome
  if ENV['CHILD']
    class ChildIsolationTest < ActiveSupport::TestCase
      include ActiveSupport::Testing::Isolation

      def self.setup
        File.open(File.join(File.dirname(__FILE__), "fixtures", "isolation_test"), "a") do |f|
          f.puts "hello"
        end
      end

      def setup
        @instance = "HELLO"
      end

      def teardown
        raise if @boom
      end

      test "runs the test" do
        assert true
      end

      test "captures errors" do
        raise
      end

      test "captures failures" do
        assert false
      end

      test "first runs in isolation" do
        assert_nil $x
        $x = 1
      end

      test "second runs in isolation" do
        assert_nil $x
        $x = 2
      end

      test "runs with slow tests" do
        sleep 0.3
        assert true
        sleep 0.2
      end

      test "runs setup" do
        assert "HELLO", @instance
      end

      test "runs teardown" do
        @boom = true
      end

      test "resets requires one" do
        assert !defined?(OmgOmg)
        assert_equal 0, $LOADED_FEATURES.grep(/fixtures\/omgomg/).size
        require File.expand_path(File.join(File.dirname(__FILE__), "fixtures", "omgomg"))
      end

      test "resets requires two" do
        assert !defined?(OmgOmg)
        assert_equal 0, $LOADED_FEATURES.grep(/fixtures\/omgomg/).size
        require File.expand_path(File.join(File.dirname(__FILE__), "fixtures", "omgomg"))
      end
    end
  else
    class ParentIsolationTest < ActiveSupport::TestCase

      File.open(File.join(File.dirname(__FILE__), "fixtures", "isolation_test"), "w") {}

      ENV["CHILD"] = "1"
      OUTPUT = `#{RbConfig::CONFIG["bindir"]}/#{RbConfig::CONFIG["ruby_install_name"]} -I#{File.dirname(__FILE__)} "#{File.expand_path(__FILE__)}" -v`
      ENV.delete("CHILD")

      def setup
        # Extract the results
        @results = {}
        OUTPUT[/Started\n\s*(.*)\s*\nFinished/mi, 1].to_s.split(/\s*\n\s*/).each do |result|
          result =~ %r'^(\w+)\(\w+\):\s*(\.|E|F)$'
          @results[$1] = { 'E' => :error, '.' => :success, 'F' => :failure }[$2]
        end

        # Extract the backtraces
        @backtraces = {}
        OUTPUT.scan(/^\s*\d+\).*?\n\n/m).each do |backtrace|
          # \n  1) Error:\ntest_captures_errors(ChildIsolationTest):
          backtrace =~ %r'\s*\d+\)\s*(Error|Failure):\n(\w+)'i
          @backtraces[$2] = { :type => $1, :output => backtrace }
        end
      end

      def assert_failing(name)
        assert_equal :failure, @results[name.to_s], "Test #{name} did not fail"
      end

      def assert_passing(name)
        assert_equal :success, @results[name.to_s], "Test #{name} did not pass"
      end

      def assert_erroring(name)
        assert_equal :error, @results[name.to_s], "Test #{name} did not error"
      end

      test "has all tests" do
        assert_equal 10, @results.length
      end

      test "passing tests are still reported" do
        assert_passing :test_runs_the_test
        assert_passing :test_runs_with_slow_tests
      end

      test "resets global variables" do
        assert_passing :test_first_runs_in_isolation
        assert_passing :test_second_runs_in_isolation
      end

      test "resets requires" do
        assert_passing :test_resets_requires_one
        assert_passing :test_resets_requires_two
      end

      test "erroring tests are still reported" do
        assert_erroring :test_captures_errors
      end

      test "runs setup and teardown methods" do
        assert_passing :test_runs_setup
        assert_erroring :test_runs_teardown
      end

      test "correct tests fail" do
        assert_failing :test_captures_failures
      end

      test "backtrace is printed for errors" do
        assert_equal 'Error', @backtraces["test_captures_errors"][:type]
        assert_match %r{isolation_test.rb:\d+:in `test_captures_errors'}, @backtraces["test_captures_errors"][:output]
      end

      test "backtrace is printed for failures" do
        assert_equal 'Failure', @backtraces["test_captures_failures"][:type]
        assert_match %r{isolation_test.rb:\d+:in `test_captures_failures'}, @backtraces["test_captures_failures"][:output]
      end

      test "self.setup is run only once" do
        text = File.read(File.join(File.dirname(__FILE__), "fixtures", "isolation_test"))
        assert_equal "hello\n", text
      end

    end
  end
end