require File.expand_path('../../../spec_helper', __FILE__)

ruby_version_is "2.4" do
  describe "Thread.report_on_exception" do
    ruby_version_is "2.4"..."2.5" do
      it "defaults to false" do
        ruby_exe("p Thread.report_on_exception").should == "false\n"
      end
    end

    ruby_version_is "2.5" do
      it "defaults to true" do
        ruby_exe("p Thread.report_on_exception").should == "true\n"
      end
    end
  end

  describe "Thread.report_on_exception=" do
    before :each do
      @report_on_exception = Thread.report_on_exception
    end

    after :each do
      Thread.report_on_exception = @report_on_exception
    end

    it "changes the default value for new threads" do
      Thread.report_on_exception = true
      Thread.report_on_exception.should == true
      t = Thread.new {}
      t.join
      t.report_on_exception.should == true
    end
  end

  describe "Thread#report_on_exception" do
    ruby_version_is "2.5" do
      it "returns true for the main Thread" do
        Thread.current.report_on_exception.should == true
      end

      it "returns true for new Threads" do
        Thread.new { Thread.current.report_on_exception }.value.should == true
      end
    end

    it "returns whether the Thread will print a backtrace if it exits with an exception" do
      t = Thread.new { Thread.current.report_on_exception = true }
      t.join
      t.report_on_exception.should == true

      t = Thread.new { Thread.current.report_on_exception = false }
      t.join
      t.report_on_exception.should == false
    end
  end

  describe "Thread#report_on_exception=" do
    describe "when set to true" do
      it "prints a backtrace on $stderr if it terminates with an exception" do
        t = nil
        -> {
          t = Thread.new {
            Thread.current.report_on_exception = true
            raise RuntimeError, "Thread#report_on_exception specs"
          }
          Thread.pass while t.alive?
        }.should output("", /Thread.+terminated with exception.+Thread#report_on_exception specs/m)

        -> {
          t.join
        }.should raise_error(RuntimeError, "Thread#report_on_exception specs")
      end
    end

    describe "when set to false" do
      it "lets the thread terminates silently with an exception" do
        t = nil
        -> {
          t = Thread.new {
            Thread.current.report_on_exception = false
            raise RuntimeError, "Thread#report_on_exception specs"
          }
          Thread.pass while t.alive?
        }.should output("", "")

        -> {
          t.join
        }.should raise_error(RuntimeError, "Thread#report_on_exception specs")
      end
    end

    ruby_bug "#13163", "2.4"..."2.5" do
      describe "when used in conjunction with Thread#abort_on_exception" do
        it "first reports then send the exception back to the main Thread" do
          t = nil
          mutex = Mutex.new
          mutex.lock
          -> {
            t = Thread.new {
              Thread.current.abort_on_exception = true
              Thread.current.report_on_exception = true
              mutex.lock
              mutex.unlock
              raise RuntimeError, "Thread#report_on_exception specs"
            }

            -> {
              mutex.sleep(5)
            }.should raise_error(RuntimeError, "Thread#report_on_exception specs")
          }.should output("", /Thread.+terminated with exception.+Thread#report_on_exception specs/m)

          -> {
            t.join
          }.should raise_error(RuntimeError, "Thread#report_on_exception specs")
        end
      end
    end
  end
end