gistfile1.rb

      it "handles a math expression" do
        tokens = lexer.parse "1 + 2 * 3"
        expected = [
          Token.new(:Decimal, 1),
          Token.new(:Identifier, "+"),
          Token.new(:Decimal, 2),
          Token.new(:Identifier, "*"),
          Token.new(:Decimal, 3)
        ]
        tokens.should == expected
        
        #repeat without whitespace
        tokens = lexer.parse "1+2*3"
        tokens.should == expected
      end