Override nested child element with spread operator in javascript
For the following req object there is a need to override the stackoverflowId attribute in a jest test
const req = {
body: {
_id: '123',
name: 'Codever',
location: 'https://www.codever.dev',
language: 'en',
description: 'This is a test bookmark',
tags: ['test'],
public: true,
stackoverflowQuestionId: null
},
params: {
userId: '456',
},
};
Project: codever - File: bookmark-request.mapper.test.js
Here is how to achieve that with the spread operator
{...req,
body : {
...req.body,
stackoverflowQuestionId: 123456
}
}
The complete function where this is used is shown below:
test.each([
[
'should set stackoverflowQuestionId if it is provided',
{...req,
body : {
...req.body,
stackoverflowQuestionId: 123456
}
},
new Bookmark({
_id: '123',
name: 'Codever',
location: 'https://www.codever.dev',
language: 'en',
description: 'This is a test bookmark',
descriptionHtml: '<p>This is a test bookmark</p>',
tags: ['test'],
public: true,
userId: '456',
likeCount: 0,
youtubeVideoId: null,
stackoverflowQuestionId: 123456,
})
],
])('%s', (testname, req, expectedBookmark) => {
const resultBookmark = bookmarkRequestMapper.toBookmark(req);
expect({...resultBookmark.toObject(), _id: {}}).toEqual({...expectedBookmark.toObject(), _id: {}});
expect(showdown.Converter).toHaveBeenCalledTimes(1);
expect(showdown.Converter().makeHtml).toHaveBeenCalledTimes(1);
expect(showdown.Converter().makeHtml).toHaveBeenCalledWith('This is a test bookmark');
});
Reference - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax
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