gistfile1.rb

describe "The raise method" do
  it "should clear $! and $@ if no exception is active" do
    $!.should be_nil
    $@.should be_nil
  end

  it "sets $! and $@ during the body of each rescue clause" do
    begin
      raise "ERROR"
    rescue
      $!.should_not be_nil
      $@.should_not be_nil
    end
  end

  it "clears $! and $@ after processing rescue clauses" do
    begin
      raise "ERROR"
    rescue
    end

    $!.should be_nil
    $@.should be_nil
  end

  it "clears $! and $@ before executing ensure clauses if the exception was handled" do
    begin
      raise "ERROR"
    rescue
      # nothing
    ensure
      $!.should be_nil
      $@.should be_nil
    end
  end

  it "clears $! and $@ if no exception was raised" do
    begin
      # nothing
    ensure
      $!.should be_nil
      $@.should be_nil
    end
  end

  it "sets $! and $@ in ensure clauses while propogating an exception up the stack" do
    begin
      begin
        raise "ERROR"
      ensure
        $!.should_not be_nil
        $@.should_not be_nil
      end
    rescue
      # eat exceptions
    ensure
      # Because of the rescue above, we should now be unset.
      $!.should be_nil
      $@.should be_nil
    end
  end

end