- Fix autorun bug that affects fork exit status in tests. (dylanahsmi…

…th/jhawthorn)

[git-p4: depot-paths = "//src/minitest/dev/": change = 12350]

lib/minitest.rb

@@ -58,7 +58,9 @@ def self.autorun
 
       exit_code = nil
 
+      pid = Process.pid
       at_exit {
+        next if Process.pid != pid
         @@after_run.reverse_each(&:call)
         exit exit_code || false
       }

test/minitest/test_minitest_test.rb

@@ -901,6 +901,20 @@ def shitty_test_case.test_order; :lol end
       shitty_test_case.i_suck_and_my_tests_are_order_dependent!
     end
   end
+
+  def test_autorun_does_not_affect_fork_success_status
+    @assertion_count = 0
+    skip "windows doesn't have skip" unless Process.respond_to?(:fork)
+    Process.waitpid(fork {})
+    assert_equal true, $?.success?
+  end
+
+  def test_autorun_does_not_affect_fork_exit_status
+    @assertion_count = 0
+    skip "windows doesn't have skip" unless Process.respond_to?(:fork)
+    Process.waitpid(fork { exit 42 })
+    assert_equal 42, $?.exitstatus
+  end
 end
 
 class TestMinitestGuard < Minitest::Test