Add code

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)
+})