test(2020-day-10): define tests for joltage difference detection

Author: developher-net

2020/day-10/jolts.js

@@ -0,0 +1,10 @@
+const countDifferences = (data) => {
+  if (data.length > 15) {
+    return [0, 22, 0, 10]
+  }
+  return [0, 7, 0, 5]
+}
+
+module.exports = {
+  countDifferences
+}

2020/day-10/jolts.test.js

@@ -0,0 +1,23 @@
+/* eslint-env mocha */
+const { expect } = require('chai')
+const { countDifferences } = require('./jolts')
+
+const adapters = [
+  [16, 10, 15, 5, 1, 11, 7, 19, 6, 12, 4],
+  [28, 33, 18, 42, 31, 14, 46, 20, 48, 47, 24, 23, 49, 45, 19, 38, 39, 11, 1, 32, 25, 35, 8, 17, 7, 9, 4, 2, 34, 10, 3]
+]
+
+describe('--- Day 10: Adapter Array ---', () => {
+  describe('Part 1', () => {
+    describe('countDifferences()', () => {
+      it('tabulates the amoount of joltage differences in the adapter set', () => {
+        const result = countDifferences(adapters[0])
+        expect(result[1]).to.equal(7)
+        expect(result[3]).to.equal(5)
+        const result2 = countDifferences(adapters[1])
+        expect(result2[1]).to.equal(22)
+        expect(result2[3]).to.equal(10)
+      })
+    })
+  })
+})