Jest mockFn.mockImplementation(fn) function

Posted by Andre Scott | Updated on | Jest


Accepts a function that should be used as the implementation of the mock. The mock itself will still record all calls that go into and instances that come from itself – the only difference is …

Jest mockFn.mock.instances function

Posted by Editorial Staff | Updated on | Jest


An array that contains all the object instances that have been instantiated from this mock function using new. For example: A mock function that has been instantiated twice would have the following mock.instances array:

Jest mockFn.mock.calls function

Posted by Jennifer | Updated on | Jest


An array containing the call arguments of all calls that have been made to this mock function. Each item in the array is an array of arguments that were passed during the call. For example: …

Jest mockFn.getMockName() function

Posted by Editorial Staff | Updated on | Jest


mockFn.getMockName() function: Returns the mock name string set by calling mockFn.mockName(value).

Is application fee of JEST examination refundable?

Posted by Andre Scott | Updated on | Jest


An Application Fee of Rs. 400 (Rs 200 for SC/ST applicants, Rs.200/- for Female applicants) is required to be paid along with the application which can be paid online. Application fee is waived for Female …

Is there any age limit for taking JEST examination?

Posted by Jennifer | Updated on | Jest


There is no restriction on age for appearing in JEST examination. However, each participating institute has its own eligibility criteria. For details on the eligibility criteria of the participating institutes candidates are advised to visit …

What are the disciplines on which JEST examination is conducted?

Posted by Jennifer | Updated on | Jest


You can appear for the JEST examination in Physics or Theoretical Computer Science but not for both.

How to add mapping in ElasticSearch using JEST

Posted by Editorial Staff | Updated on | Jest


I found your question while trying to see if I could create an index and mappings in one go. I ended up just creating a second request for creating mappings.

Elasticsearch get source field data with java api

Posted by Andre Scott | Updated on | Jest


Try using fetchSource() like this:

Testing Vue filters with jest

Posted by Editorial Staff | Updated on | Jest


If you’re writing filters used in multiple components, then it’s quite easy to test. Since Vue.filter simply takes a function, you can just write a test for the function independently of the filter by exporting the definition, like so: …

How can I test React component’s style with Jest + Enzyme?

Posted by Jennifer | Updated on | Jest


There are a few mistakes in your provided code: You should not be using DOM element’s style property because React does not manage it. Shift the hidden property into the state instead. I believe headerStyle is a shallow copy of the …

React Enzyme Jest test component with className

Posted by Andre Scott | Updated on | Jest


The below code worked for me:

Jest fails to transpile import from npm linked module

Posted by Jennifer | Updated on | Jest


I had to change the transformIgnorePatterns configuration option of Jest in the package.json of the web module.

How to test image upload stream with supertest and jest?

Posted by Jennifer | Updated on | Jest


This should work. To pipe data to a request you have to tell the readable stream to pipe to the request. The other way is for receiving data from the server. This also uses done …

How does Jest’s callback testing actually work

Posted by Andre Scott | Updated on | Jest


A function has a .length property that returns the number of arguments that are declared for it: That’s how Jest knows that your test handler expects a done callback, and it will assume the test …