tests: improve tests (#33)

* test(math): improve tests

* test(number): improve tests

* test(util): improve tests

tests/math.spec.ts

@@ -17,6 +17,7 @@ it('minBy', () => {
 it('maxBy', () => {
   expect(maxBy([{ value: 1 }, { value: 2 }, { value: 3 }], (item) => item.value)).toEqual({ value: 3 })
   expect(maxBy<{ value: number }>([], (item) => item.value)).toEqual(undefined)
+  expect(maxBy([{ value: 3 }, { value: 2 }, { value: 1 }], (item) => item.value)).toEqual({ value: 3 })
 })
 
 it('mean', () => {

tests/number.spec.ts

@@ -40,6 +40,10 @@ it('randomNumber', () => {
   expect(random).toBeGreaterThanOrEqual(min)
   expect(random).toBeLessThanOrEqual(max)
   expect(randomNumber(0, 0)).toBe(0)
+
+  const randomDefault = randomNumber()
+  expect(randomDefault).toBeGreaterThanOrEqual(0)
+  expect(randomDefault).toBeLessThanOrEqual(100)
 })
 
 it('times', () => {

tests/util.spec.ts

@@ -267,6 +267,7 @@ describe('copyText', () => {
 
 it('download', () => {
   let href = ''
+  let filename = ''
 
   Reflect.defineProperty(HTMLAnchorElement.prototype, 'href', {
     set(v) {
@@ -277,13 +278,24 @@ it('download', () => {
     },
   })
 
+  Reflect.defineProperty(HTMLAnchorElement.prototype, 'download', {
+    set(v) {
+      filename = v
+    },
+    get() {
+      return filename
+    },
+  })
+
   URL.createObjectURL = vi.fn(() => 'mock')
   URL.revokeObjectURL = vi.fn()
   download(new Blob(['hello']), 'test.txt')
   expect(href).toBe('mock')
+  expect(filename).toBe('test.txt')
   expect(URL.createObjectURL).toHaveBeenCalled()
   expect(URL.revokeObjectURL).toHaveBeenCalled()
 
-  download('/a.jpg', 'test.txt')
+  download('/a.jpg')
   expect(href).toBe('/a.jpg')
+  expect(filename).toBe('file')
 })