Added the tests for coinChangeMin function

Author: mandy8055

Dynamic-Programming/CoinChange.js

@@ -15,3 +15,19 @@ export const change = (coins, amount) => {
   }
   return combinations[amount]
 }
+/**
+ * @params {Array} coins
+ * @params {Number} amount
+ */
+export const coinChangeMin = (coins, amount) => {
+  const map = { 0: 1 }
+  for (let i = 1; i <= amount; i++) {
+    let min = Infinity
+    for (const coin of coins) {
+      if (i < coin) continue
+      min = Math.min(min, 1 + map[i - coin])
+    }
+    map[i] = min
+  }
+  return map[amount] === Infinity ? -1 : map[amount] - 1
+}

Dynamic-Programming/tests/CoinChange.test.js

@@ -1,37 +1,44 @@
-import { change } from '../CoinChange'
+import { change, coinChangeMin } from '../CoinChange'
 
 test('Base Case 1', () => {
   const coins = [2, 3, 5]
   const amount = 0
   expect(change(coins, amount)).toBe(1)
+  expect(coinChangeMin(coins, amount)).toBe(0)
 })
 test('Base Case 2', () => {
   const coins = []
   const amount = 100
   expect(change(coins, amount)).toBe(0)
+  expect(coinChangeMin(coins, amount)).toBe(-1)
 })
 test('Test Case 1', () => {
   const coins = [2, 4, 5]
   const amount = 12
   expect(change(coins, amount)).toBe(5)
+  expect(coinChangeMin(coins, amount)).toBe(3)
 })
 test('Test Case 2', () => {
   const coins = [5, 2, 3, 7, 6, 1, 12, 11, 9, 15]
   const amount = 45
   expect(change(coins, amount)).toBe(12372)
+  expect(coinChangeMin(coins, amount)).toBe(3)
 })
 test('Test Case 3', () => {
   const coins = [2]
   const amount = 3
   expect(change(coins, amount)).toBe(0)
+  expect(coinChangeMin(coins, amount)).toBe(-1)
 })
 test('Test Case 4', () => {
   const coins = [3, 5, 7, 8, 9, 10, 11]
   const amount = 500
   expect(change(coins, amount)).toBe(35502874)
+  expect(coinChangeMin(coins, amount)).toBe(46)
 })
 test('Test Case 5', () => {
   const coins = [10]
   const amount = 10
   expect(change(coins, amount)).toBe(1)
+  expect(coinChangeMin(coins, amount)).toBe(1)
 })