Add node, chai, jest diff comparison

README.md

@@ -65,3 +65,8 @@ See also:
 
 - Custom formatters: https://github.com/cucumber/cucumber-js/blob/master/docs/custom_formatters.md
 - Built-in formatters: https://github.com/cucumber/cucumber-js/tree/master/src/formatter.
+
+### assertion
+
+This package contains some failing tests demonstrating object diffs provided by
+node's native asserts, chai and jest.

assertion/features/chai-variants.feature

@@ -0,0 +1,7 @@
+Feature: Chai variants
+	Scenario:
+		When I use chai
+		Then I can choose the expect syntax
+
+		When I use chai
+		Then I can choose the should syntax

assertion/features/failure.feature

@@ -0,0 +1,12 @@
+Feature: Failure
+	Scenario:
+		When I use chai
+		Then I see chai diff on failure
+
+	Scenario:
+		When I use jest
+		Then I see jest diff on failure
+
+	Scenario:
+		When I use node
+		Then I see node diff on failure

assertion/features/steps/chai-expect.js

@@ -0,0 +1,6 @@
+const { expect } = require('chai')
+const { Then } = require('cucumber')
+
+Then('I can choose the expect syntax', function () {
+  expect(true).to.be.true
+})

assertion/features/steps/chai-failure.js

@@ -0,0 +1,10 @@
+const { expect } = require('chai')
+const { When, Then } = require('cucumber')
+const compared = require('../support/compared')
+
+When('I use chai', function () {
+})
+
+Then('I see chai diff on failure', function () {
+ expect(compared.actual).to.deep.equal(compared.expected)
+})

assertion/features/steps/chai-should.js

@@ -0,0 +1,8 @@
+const { Then } = require('cucumber')
+require('chai').should()
+
+Then('I can choose the should syntax', function () {
+  const boolean = true
+
+  boolean.should.be.true
+})

assertion/features/steps/jest-failure.js

@@ -0,0 +1,10 @@
+const expect = require('expect')
+const { When, Then } = require('cucumber')
+const compared = require('../support/compared')
+
+When('I use jest', function () {
+})
+
+Then('I see jest diff on failure', function () {
+  expect(compared.actual).toEqual(compared.expected)
+})

assertion/features/steps/node-failure.js

@@ -0,0 +1,10 @@
+const assert = require('assert')
+const { When, Then } = require('cucumber')
+const compared = require('../support/compared')
+
+When('I use node', function () {
+})
+
+Then('I see node diff on failure', function () {
+  assert.equal(compared.actual, compared.expected)
+})

assertion/features/support/compared.js

@@ -0,0 +1,9 @@
+module.exports = {
+  actual: {},
+  expected: [
+    {
+      author: 'Nicolaus Cusanus',
+      title: 'Die belehrte Unwissenheit'
+    }
+  ]
+}

assertion/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "assertion",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "cucumber-js"
+  },
+  "author": "Eugen Wissner <belka@caraus.de>",
+  "license": "MPL-2.0",
+  "devDependencies": {
+    "chai": "^4.2.0",
+    "cucumber": "^5.0.3",
+    "expect": "^23.6.0"
+  }
+}