     it "displays partial parentheses", ->
       exp = @exp_pos_builder(10, '*', [])
       actual = @to_html_string(exp)
-      expect(actual).toEqual "10 &times; "
+      expect(actual).toEqual "10 &times; ( "
 
     it "displays single sub-expressions with parentheses", ->
       exp = @exp_pos_builder(10, '*', [5])

  it "correctly displays pi", ->
    exp = @exp_pos_builder('pi')
    actual = @to_html_string(exp)
    expect(actual).toEqual "&pi;"

      power = []

      exp = @exp_pos_builder('^': [10, []])
      expect(@to_string(exp)).toEqual "10 ^ ( "
      expect(@to_html_string(exp)).toEqual "10 &circ; ( "

  describe "multiplication", ->
    it "", ->
