plugins.test.js

const fs = require('fs');

const plugins = fs.readFileSync('./plugins.json').toString();

// helper function
const countPluginKey = (plugins, key) => plugins
 .reduce((previous, plugin) => !!plugin[key] ? previous += 1 : previous, 0);

describe('plugins', () => {
 it('should be valid JSON', () => {
 expect(() => {JSON.parse(plugins)}).not.toThrow();
 });

 it('should have all required keys', () => {
 const parsed = JSON.parse(plugins);
 const pluginsCount = parsed.length;

 const nameCount = countPluginKey(parsed, 'name');
 const descriptionCount = countPluginKey(parsed, 'description');
 const githubUrlCount = countPluginKey(parsed, 'githubUrl');

 expect(nameCount).toBe(pluginsCount);
 expect(descriptionCount).toBe(pluginsCount);
 expect(githubUrlCount).toBe(pluginsCount);
 });

 it('should be unique', () => {
 const parsed = JSON.parse(plugins);
 const pluginsCount = parsed.length;

 // create an array only containing the plugin names
 const pluginNames = parsed.map((plugin) => plugin.name);

 const uniquePlugins = [];
 pluginNames.forEach((plugin) => {
 if (uniquePlugins.indexOf(plugin) === -1) uniquePlugins.push(plugin)
 });

 const uniquePluginsCount = uniquePlugins.length;

 expect(pluginsCount).toBe(uniquePluginsCount);
 });
});