Add code

3bg/babel.config.js

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+module.exports = {
+  presets: [
+    [ '@babel/env', {
+      useBuiltIns: 'usage'
+    }]
+  ]
+}

3bg/features/addition.feature

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+Feature: Add Numbers
+	As a user of the calculator
+	I want to add 2 numbers
+
+	Background:
+		Given the start value is 5
+
+	Scenario: Add numbers
+		When I add 6
+		Then the result should be 11
+
+	Scenario: Add numbers
+		When I add 25
+		Then the result should be 30

3bg/features/concat.feature

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+Feature: Concatenate strings
+	As a user of the concatenator
+	I want to concatenate 2 strings
+
+	Background:
+		Given the start value is "Georg"
+
+	Scenario: Concatenate strings
+		When I concatenate "Cantor"
+		Then the result should be "Georg Cantor"
+
+	Scenario: Concatenate strings
+		When I concatenate "Wilhelm"
+		When I concatenate "Friedrich"
+		When I concatenate "Hegel"
+		Then the result should be "Georg Wilhelm Friedrich Hegel"

3bg/features/steps/addition.js

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+import { Given, When, Then } from 'cucumber'
+import { expect } from 'chai'
+
+Given('the start value is {int}', function (int) {
+  this.calc = int
+})
+
+When('I add {int}', function (int) {
+  this.calc += int
+})
+
+Then('the result should be {int}', function (int) {
+  expect(this.calc).to.equal(int)
+})

3bg/features/steps/concat.js

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+import { Given, When, Then } from 'cucumber'
+import { expect } from 'chai'
+
+Given('the start value is {string}', function (string) {
+  this.concat = string
+})
+
+When('I concatenate {string}', function (string) {
+  this.concat += ' ' + string
+})
+       
+Then('the result should be {string}', function (string) {
+  expect(string).to.equal(this.concat)
+})

3bg/package.json

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+{
+  "name": "3bg",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "cucumber-js --require-module '@babel/register'"
+  },
+  "author": "Eugen Wissner <belka@caraus.de>",
+  "license": "MPL-2.0",
+  "dependencies": {
+    "@babel/core": "^7.1.5",
+    "@babel/preset-env": "^7.1.5",
+    "@babel/register": "^7.0.0",
+    "babel-loader": "^8.0.4",
+    "chai": "^4.2.0",
+    "cucumber": "^5.0.2"
+  }
+}