# File test/src/expression_test.rb, line 57
  def testPrefix
    parser = whitespace.many_ >> int.prefix(negate) << eof
    assertParser(' - -3 ', 3, parser)
    assertParser(' 3', 3, parser)
    assertParser('3 ', 3, parser)
    assertParser('-3', -3, parser)
    assertError(' - -', 'integer expected', parser, 4)
    assertError(' - -5 3', 'EOF expected', parser, 6)
  end