Add level bonus calculation script

common/script/methods/statCalculations.js

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+'use strict';
+
+var Content = require('../content.coffee');
+
+function levelBonus(level) {
+  // Level bonus is derived by taking the level, subtracting one,
+  // taking the smaller of it or maxLevel (100),
+  // dividing that by two and then raising it to a whole number
+
+  // TODO: 100 is a magic number, extract from script.index into own module and call here
+  var levelOrMaxLevel = Math.min((level - 1), 100)
+  var levelDividedByTwo = levelOrMaxLevel / 2
+  var statBonus = Math.ceil(levelDividedByTwo )
+
+  return statBonus;
+}
+
+module.exports = {
+  levelBonus: levelBonus
+}

test/common/statCalculations.js

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+'use strict';
+var sinon = require('sinon');
+var chai = require("chai");
+chai.use(require("sinon-chai"));
+var expect = chai.expect;
+
+var statCalc = require('../../common/script/methods/statCalculations');
+
+describe('stat calculation functions', function() {
+  describe('calculateLevelStatBonus', function() {
+    it('calculates bonus as half of level for even numbered level under 100', function() {
+      var level = 50;
+      var bonus = statCalc.levelBonus(level);
+      expect(bonus).to.eql(25);
+    });
+
+    it('calculates bonus as half of level, rounded down, for odd numbered level under 100', function() {
+      var level = 51;
+      var bonus = statCalc.levelBonus(level);
+      expect(bonus).to.eql(25);
+    });
+
+    it('calculates bonus as 50 for levels >= 100', function() {
+      var level = 150;
+      var bonus = statCalc.levelBonus(level);
+      expect(bonus).to.eql(50);
+    });
+
+    it('calculates bonus as 0 for level 1', function() {
+      var level = 1;
+      var bonus = statCalc.levelBonus(level);
+      expect(bonus).to.eql(0);
+    });
+  });
+});