test: add cases for utils

test/utils.spec.ts

@@ -0,0 +1,54 @@
+/* eslint-disable unicorn/no-await-expression-member */
+
+import {
+  cleanNilValues,
+  extractDataFromResponse,
+  isPlainObject,
+  normalizeUrl,
+} from 'x-fetch'
+
+test('isPlainObject', () => {
+  expect(isPlainObject({})).toBe(true)
+  expect(isPlainObject([])).toBe(false)
+  expect(isPlainObject(0)).toBe(false)
+  expect(isPlainObject(true)).toBe(false)
+})
+
+test('cleanNilValues', () => {
+  expect(cleanNilValues('')).toBe('')
+  expect(cleanNilValues(true)).toBe(true)
+  expect(cleanNilValues({ foo: 'bar' })).toEqual({ foo: 'bar' })
+  expect(cleanNilValues({ foo: 'bar', test: null })).toEqual({ foo: 'bar' })
+  expect(cleanNilValues({ foo: 'bar', test: '' })).toEqual({
+    foo: 'bar',
+    test: '',
+  })
+  expect(cleanNilValues({ foo: 'bar', test: '' }, true)).toEqual({ foo: 'bar' })
+})
+
+test('normalizeUrl', () => {
+  expect(normalizeUrl('')).toBe('')
+  expect(normalizeUrl('', { foo: 'bar' })).toBe('?foo=bar')
+  expect(normalizeUrl('', { foo: ['bar', 'baz'] })).toBe('?foo=bar&foo=baz')
+  expect(normalizeUrl('test?x=y')).toBe('test?x=y')
+  expect(normalizeUrl('test?x=y', { foo: 'bar' })).toBe('test?x=y&foo=bar')
+  expect(normalizeUrl('test?x=y', { foo: ['bar', 'baz'] })).toBe(
+    'test?x=y&foo=bar&foo=baz',
+  )
+})
+
+test('extractDataFromResponse', async () => {
+  expect(await extractDataFromResponse(new Response(''), null)).toBe(undefined)
+  expect(await extractDataFromResponse(new Response(), null)).toBe(undefined)
+  expect(await extractDataFromResponse(new Response(), 'text')).toBe('')
+  expect(await extractDataFromResponse(new Response(null), 'text')).toBe('')
+  expect(await extractDataFromResponse(new Response('foo'), 'text')).toBe('foo')
+  expect(await extractDataFromResponse(new Response('foo'), 'json')).toBe('foo')
+  expect(
+    await extractDataFromResponse(new Response('{"foo":"bar"}'), 'json'),
+  ).toEqual({ foo: 'bar' })
+  expect(
+    (await extractDataFromResponse(new Response('foo'), 'arrayBuffer'))
+      .byteLength,
+  ).toBe(3)
+})