Add code

1args/features/addition.feature

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

1args/features/concat.feature

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+Feature: Concatenate strings
+  As a user of the concatenator
+  I want to concatenate 2 strings
+
+  Scenario: Concatenate strings
+    When I concatenate "Georg" and "Cantor"
+    Then the result should be "Georg Cantor"

1args/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) {
+})
+
+When('I add {int}', function (int) {
+})
+
+Then('the result should be {int}', function (int) {
+  expect(int).to.equal(11)
+})

1args/features/steps/concat.js

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+import { When, Then } from 'cucumber'
+import { expect } from 'chai'
+
+When('I concatenate {string} and {string}', function (string, string2) {
+})
+       
+Then('the result should be {string}', function (string) {
+  expect(string).to.equal("Georg Cantor")
+})