test: add e2e tests for the counter

Author: alexandr-g

cypress/integration/counter.spec.js

@@ -0,0 +1,18 @@
+/* eslint-disable no-undef */
+describe('counter', () => {
+  beforeEach(() => {
+    cy.visit('/')
+  })
+
+  it('should increment the counter', () => {
+    cy.get('h4').contains('0')
+    cy.get("[data-qa='increment-counter']").click()
+    cy.get('h4').contains('1')
+  })
+
+  it('should decrement the counter', () => {
+    cy.get('h4').contains('0')
+    cy.get("[data-qa='decrement-counter']").click()
+    cy.get('h4').contains('-1')
+  })
+})