Add code

data-tables/features/steps/json.js

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+import { Given, When, Then } from 'cucumber'
+import { expect } from 'chai'
+
+Given('the following books by Simon Frank are in the collection:', function (dataTable) {
+  this.objects = []
+  dataTable.hashes().forEach(el => {
+    this.objects.push({
+      id: parseInt(el.id),
+      title: el.title
+    })
+  })
+})
+
+Given('the following books by Søren Kierkegaard are in the collection:', function (dataTable) {
+  this.objects = []
+  dataTable.rows().forEach(el => {
+    this.objects.push({
+      id: parseInt(el[0]),
+      title: el[1]
+    })
+  })
+})
+
+Given('the following book is in the collection:', function (dataTable) {
+  const data = dataTable.rowsHash()
+  this.objects = {
+    id: parseInt(data.id),
+    title: data.title,
+    author: data.author
+  }
+})
+
+Given('the following books are in the collection:', function (dataTable) {
+  this.objects = []
+  dataTable.raw().forEach(el => {
+    this.objects.push({
+      author: el[0],
+      title: el[1]
+    })
+  })
+})
+
+When('I stringify it', function () {
+  this.result = JSON.stringify(this.objects)
+})
+
+Then('I should get:', function (expected) {
+  expect(JSON.parse(expected))
+    .to.deep.equal(JSON.parse(this.result))
+})