your task is to provide suite of textYour task is to provide a suite of tests for an invert

function, using Jest framework, covering all the

requirements below.

Description of the invert function

invert function accepts a string and returns a string.

When the string is empty it returns empty string.

When the argument passed to the method is null or

undefined it returns an empty string

When the string has exactly one character the same

string is returned

When the string is longer then $1$ character its inverted

version is returned.

Examples of invert function usage

const invert