wip(shared): adapt to v3

test/common_old/statHelpers.test.js

@@ -0,0 +1,66 @@
+import {
+  maxHealth,
+  maxLevel,
+  capByLevel,
+  tnl,
+  diminishingReturns,
+} from '../../common/script/index';
+
+describe('helper functions used in stat calculations', () => {
+  describe('maxHealth', () => {
+    it('provides a maximum Health value', () => {
+      const HEALTH_CAP = 50;
+
+      expect(maxHealth).to.eql(HEALTH_CAP);
+    });
+  });
+
+  const LEVEL_CAP = 100;
+  const LEVEL = 57;
+
+  describe('maxLevel', () => {
+    it('returns a maximum level for attribute gain', () => {
+      expect(maxLevel).to.eql(LEVEL_CAP);
+    });
+  });
+
+  describe('capByLevel', () => {
+    it('returns level given if below cap', () => {
+      expect(capByLevel(LEVEL)).to.eql(LEVEL);
+    });
+
+    it('returns level given if equal to cap', () => {
+      expect(capByLevel(LEVEL_CAP)).to.eql(LEVEL_CAP);
+    });
+
+    it('returns level cap if above cap', () => {
+      expect(capByLevel(LEVEL_CAP + LEVEL)).to.eql(LEVEL_CAP);
+    });
+  });
+
+  describe('toNextLevel', () => {
+    it('increases Experience target from one level to the next', () => {
+      _.times(110, (level) => {
+        expect(tnl(level + 1)).to.be.greaterThan(tnl(level));
+      });
+    });
+  });
+
+  describe('diminishingReturns', () => {
+    const BONUS = 600;
+    const MAXIMUM = 200;
+    const HALFWAY = 75;
+
+    it('provides a value under the maximum, given a bonus and maximum', () => {
+      expect(diminishingReturns(BONUS, MAXIMUM)).to.be.lessThan(MAXIMUM);
+    });
+
+    it('provides a value under the maximum, given a bonus, maximum, and halfway point', () => {
+      expect(diminishingReturns(BONUS, MAXIMUM, HALFWAY)).to.be.lessThan(MAXIMUM);
+    });
+
+    it('provides a different curve if a halfway point is defined', () => {
+      expect(diminishingReturns(BONUS, MAXIMUM, HALFWAY)).to.not.eql(diminishingReturns(BONUS, MAXIMUM));
+    });
+  });
+});