5 colors /level, sound when ball or brick change color

src/game_utils.test.ts

@@ -0,0 +1,42 @@
+import {getMajorityValue, sample, sumOfKeys} from "./game_utils";
+
+describe('getMajorityValue', ()=>{
+
+    it('returns the most common string',()=>{
+        expect(getMajorityValue(['1','1','2','2','3','2','3','2','2','1'])).toStrictEqual('2')
+    })
+    it('returns the only string',()=>{
+        expect(getMajorityValue(['1'])).toStrictEqual('1')
+    })
+    it('returns nothing for empty array',()=>{
+        expect(getMajorityValue([])).toStrictEqual(undefined)
+    })
+
+})
+describe('sample', ()=>{
+
+    it('returns a random pick from the array',()=>{
+        expect(['1','2','3'].includes(sample(['1','2','3']))).toBeTruthy()
+    })
+    it('returns the only item if there is just one',()=>{
+        expect(sample(['1'])).toStrictEqual('1')
+    })
+    it('returns nothing for empty array',()=>{
+        expect(sample([])).toStrictEqual(undefined)
+    })
+
+})
+describe('sumOfKeys', ()=>{
+    it('returns the sum of the keys of an array',()=>{
+        expect(sumOfKeys({a:1,b:2})).toEqual(3)
+    })
+    it('returns 0 for an empty object',()=>{
+        expect(sumOfKeys({})).toEqual(0)
+    })
+    it('returns 0 for undefined',()=>{
+        expect(sumOfKeys(undefined)).toEqual(0)
+    })
+    it('returns 0 for null',()=>{
+        expect(sumOfKeys(null)).toEqual(0)
+    })
+})