Add code

4outline/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)
+})

4outline/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)
+})