                   grade:
                     differentiation: df
                     mitoticCount: mc
-                    necrosis_score: nc
+                    necrosisScore: nc
                 expected = expectedSummaryGrade(tnm.grade)
                 actual = TNM.summaryGrade(tnm)
                 expect(actual, "The summary grade for" +

          else
            3

        # FIXME - the test case below once passed but now fails.
        # The test is disabled by using xit rather than it.
        # Change xit to it, fix the problem and remove this comment.
        xit 'should calculate the summary grade', ->
          for df in [1..3]
            for mc in [1..3]
              for nc in [1..2]

        # @returns the expected summary grade
        expectedSummaryGrade = (grade) ->
          cumulativeGrade = grade.differentiation + grade.mitoticCount +
            grade.necrosisScore
          if cumulativeGrade < 4
            1
          else if cumulativeGrade < 6
