add: 只出现一次的数字等

test/array/first-missing-prime-number.test.js

@@ -0,0 +1,15 @@
+import firstMissingPrime, { isPrinme } from '../../src/array/first-missing-prime-number'
+
+test('是否是素数', () => {
+  expect(isPrinme(0)).toBe(false)
+  expect(isPrinme(1)).toBe(false)
+  expect(isPrinme(3)).toBe(true)
+  expect(isPrinme(5)).toBe(true)
+  expect(isPrinme(7)).toBe(true)
+  expect(isPrinme(6)).toBe(false)
+})
+
+test('缺失的第一个素数', () => {
+  expect(firstMissingPrime([3, 5, 7])).toBe(2)
+  expect(firstMissingPrime([2, 3, 5, 7, 11, 13, 17, 23, 29])).toBe(19)
+})