Added jest tests

Author: HaykRssApp

.env.example

@@ -0,0 +1,3 @@
+# RSS.app keys
+RSS_APP_API_KEY=
+RSS_APP_API_SECRET=

.gitignore

@@ -1,3 +1,5 @@
 node_modules
 /lib
 examples/generate-rss-feed/typescript-node/*.js
+coverage
+.env

.npmignore

@@ -1,4 +1,7 @@
 src
 tsconfig.json
 tslint.json
-.prettierrc
+.prettierrc
+jest.config.js
+.env
+.env.example

README.md

@@ -2,6 +2,8 @@
 
 [![Version](https://img.shields.io/npm/v/rss-generator-api.svg)](https://www.npmjs.org/package/rss-generator-api)
 [![Try on RunKit](https://badge.runkitcdn.com/rss-generator-api.svg)](https://npm.runkit.com/rss-generator-api)
+[![Types](https://badgen.net/npm/types/rss-generator-api)](https://www.npmjs.org/package/rss-generator-api)
+[![Covarage](https://badgen.net/codecov/c/github/babel/babel)](https://www.npmjs.org/package/rss-generator-api)
 
 The rss-generator-api library provides convenient access to the RSS.app API from
 applications written in JavaScript.
@@ -10,6 +12,13 @@ applications written in JavaScript.
 
 See the [ API docs](https://rss.app/docs/api) for Node.js.
 
+## Live Demo
+
+A minimal demo project can be found in [examples directory](https://github.com/RSSapp/rssapp-node/tree/main/examples).
+
+[Online demo](https://npm.runkit.com/rss-generator-api) is also available!
+
+
 ## Requirements
 
 Node 8 or higher.

jest.config.js

@@ -0,0 +1,8 @@
+module.exports = {
+  transform: { '^.+\\.ts?$': 'ts-jest' },
+  testEnvironment: 'node',
+  testRegex: '/tests/.*\\.(test|spec)?\\.(ts|tsx)$',
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
+  setupFiles: ['dotenv/config'],
+  coverageReporters: ['json-summary', 'lcov'],
+};