Jest (JavaScript framework)

Jest[1] is a JavaScript testing framework maintained by Facebook, Inc. with a focus on simplicity. It works with projects using: Babel, TypeScript, Node.js, React, Angular, Vue.js and Svelte. It aims to work out of the box and config free.

Usage and examples

 
$ npm install --save-dev jest

For the following module, we will write a corresponding test case:

function sum(a, b) {
  return a + b;
}
module.exports = sum;

If the above file was named sum.js, we will write our test case in a file named sum.test.js for jest to automatically pick it up. The contents of the file will be: 

const sum = require('./sum');

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
});
module.exports = sum;

Then, from the command line, run the command

$ npm run test

This runs the test and outputs the corresponding result in your command line.

gollark: If you want to see the table's contents, use the `textutils.serialise` function.
gollark: It means it's returning a table, and `tostring` which I believe `print` uses internally doesn't actually print their contents.
gollark: Though that will create a trailing space and comma.
gollark: Assuming you meant `"five"` instead of `"5"`, simple enough I think:```lualocal out = ""for ix, v in pairs(name_of_that_table) do out = out .. ("%d %s, "):format(ix, v)endreturn out```
gollark: Like globals, but more so.

See also

References
  1. "Jest Website".
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