add: 只出现一次的数字等

test/array/maximum-gap.test.js

@@ -0,0 +1,10 @@
+import maximumGap from '../../src/array/maximum-gap'
+import inData from './maximum-gap.test.data'
+
+test('最大间距', () => {
+  expect(maximumGap([3, 6, 9, 1])).toBe(3)
+  expect(maximumGap([10])).toBe(0)
+  expect(maximumGap([13, 16, 19, 1])).toBe(12)
+  expect(maximumGap([1, 3, 100])).toBe(97)
+  expect(maximumGap(inData)).toBe(2147428092)
+})