jest-plugin-context
v2.9.0
Published
Adds context as an alternative to describe to jest.
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jest-plugin-context
Adds context
as an alternative to describe
for jest.
Getting Started
Install jest-plugin-context
using yarn
:
yarn add --dev jest-plugin-context
Motivation
RSpec took the ruby world by storm with its declarative method of TDD. In RSpec, describe
it used to wrap a set of tests against one functionality while context
is to wrap a set of tests against one functionality under the same state.
The difference being you should only describe
to test the User model and specifically describe
the #name
method. However, testing different states of the #name
method should use different context. You can view an example of this below.
Usage
If you want, you can import context
from jest-plugin-context
at the top of every test:
import context from 'jest-plugin-context';
If you want to install context
as a global, you can modify the jest
section of your package.json
to include:
"jest": {
"setupFiles": [
"jest-plugin-context/setup"
]
}
Example
Here's an example test that uses context
:
describe('User', () => {
describe('#name', () => {
set('firstName', () => 'Harry');
set('lastName', () => 'Potter');
set('user', () => new User({firstName, lastName}));
context('with blank first name', () => {
set('firstName', () => null);
it('should return only the last name', () => {
expect(user.name).toEqual('Potter');
});
});
context('with blank last name', () => {
set('lastName', () => null);
it('should return only the first name', () => {
expect(user.name).toEqual('Harry');
});
});
});
});