feat: Add threshold usage test

Author: PippoRaimondi

cypress/specs/image-diff-spec.js

@@ -3,6 +3,11 @@ it('should compare screenshot of the entire page', () => {
   cy.compareSnapshot('wholePage')
 })
 
+it('should compare screenshot of the entire page', () => {
+  cy.visit('../../report-example.html')
+  cy.compareSnapshot('wholePageThreshold', 0.2)
+})
+
 it('should compare screenshot from a given element', () => {
   cy.visit('../../report-example.html')
   cy.get('#report-header').compareSnapshot('element')

package.json

@@ -5,7 +5,7 @@
   "main": "dist/command.js",
   "scripts": {
     "test:unit": "jest src/",
-    "test:e2e": "npx run build && cypress run --browser chrome",
+    "test:e2e": "npm run build && cypress run --browser chrome --headless",
     "build": "npx babel src -d dist"
   },
   "repository": {