javascript - `assert.IfError(value)` 的 Jest 替代品

Question

assert的节点文档assert.ifError 模块

Throws value if value is not undefined or null. This is useful when testing the error argument in callbacks. The stack trace contains all frames from the error passed to ifError() including the potential new frames for ifError() itself.

assert.ifError(null);
// OK
assert.ifError(0);
// AssertionError [ERR_ASSERTION]: ifError got unwanted exception: 0
assert.ifError('error');
// AssertionError [ERR_ASSERTION]: ifError got unwanted exception: 'error'
assert.ifError(new Error());
// AssertionError [ERR_ASSERTION]: ifError got unwanted exception: Error

asser.IfError 的 Jest 替代品是什么？

Answer 1

好吧，我明白了。

解决方案 1。expect.toContain 匹配器。

expect([undefined, null]).toContain(value);

解决方案 2.jest.extended 模块 toBeNil方法

安装

yarn add -D jest-extended

检查值是否为 null 或 undefined 时使用 .toBeNil。

test('passes when value is null or undefined', () => {
  expect(null).toBeNil();
  expect(undefined).toBeNil();
  expect(true).not.toBeNil();
});