Nodejs and Reactjs Unit test tools--jest

Jest--painless JavaScript UnitTesting

Characteristics

1. Strong Adaptability
   1. use Jasmine assertion by default
   2. the modular
   3. the extensible
   4. can be configured with
2. sandbox-style and fast
   1. virtualized JS Environment, simulation browser
   2. running worker threads in parallel
3. The default simulation framework
   1. automatically simulates all modules by default for easy testing of current code

Integrated Babel

1. Necessity
   1. supports ES6 standard syntax
   2. support for react specific syntax
2. Installing components

NPM Install--save-dev babel-jest Babel-polyfill

1. Configure Babel

   {
        

    "presets": ["es2015", "react"]
        

   }
        

Test change Code only

Jest–onlychanged or Jest-o

Manual simulation

Convention: Manual simulation files are placed under the "__mocks__" folder in the project root directory.

Enter test results

1. command: Jest–json
2. terminal output (as shown):

   Note: If there is a mistake, the output error stack information is appended.
   

Generate Coverage Report

1. command: Jest–coverage
2. terminal output (as shown):

3. Build Site file contents (as shown):
   Browse the site (as shown):

   Note: The table of contents can also be accessed and browse the file content.

   
   

More content

1. Jest Home
2. git home

Nodejs and Reactjs Unit test tools--jest