Visual code user snippets - http://www.davidhayden.me/blog/visual-studio-code-snippets

VS code snippts javascript.json

{
/*
	// Place your snippets for JavaScript here. Each snippet is defined under a snippet name and has a prefix, body and 
	// description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the 
	// same ids are connected.
	// Example:
	"Print to console": {
		"prefix": "log",
		"body": [
			"console.log('$1');",
			"$2"
		],
		"description": "Log output to console"
	}	
*/
"jestFile": {
		"prefix": "jfile",
		"body": [
			"import { mount, shallow, render } from 'enzyme';",
			"import React from 'react'",
			"",
			"test('$1', () => {",
			"$0",
			"})"
		],
		"description": "create a new jest file."
	},
"mstore": {
		"prefix": "mstore",
		"body": [
			"import configureStore from 'redux-mock-store';",
			"",
			"const mockStore = configureStore([]);",
			"",
			"const store = mockStore({",
			"$0",
			"})"
		],
		"description": "create a new jest file."
	}	

}