🧪 Add e2e tests with Cypress

frontend/cypress/integration-examples/2-advanced-examples/connectors.spec.js

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+/// <reference types="cypress" />
+
+context('Connectors', () => {
+  beforeEach(() => {
+    cy.visit('https://example.cypress.io/commands/connectors')
+  })
+
+  it('.each() - iterate over an array of elements', () => {
+    // https://on.cypress.io/each
+    cy.get('.connectors-each-ul>li')
+      .each(($el, index, $list) => {
+        console.log($el, index, $list)
+      })
+  })
+
+  it('.its() - get properties on the current subject', () => {
+    // https://on.cypress.io/its
+    cy.get('.connectors-its-ul>li')
+      // calls the 'length' property yielding that value
+      .its('length')
+      .should('be.gt', 2)
+  })
+
+  it('.invoke() - invoke a function on the current subject', () => {
+    // our div is hidden in our script.js
+    // $('.connectors-div').hide()
+
+    // https://on.cypress.io/invoke
+    cy.get('.connectors-div').should('be.hidden')
+      // call the jquery method 'show' on the 'div.container'
+      .invoke('show')
+      .should('be.visible')
+  })
+
+  it('.spread() - spread an array as individual args to callback function', () => {
+    // https://on.cypress.io/spread
+    const arr = ['foo', 'bar', 'baz']
+
+    cy.wrap(arr).spread((foo, bar, baz) => {
+      expect(foo).to.eq('foo')
+      expect(bar).to.eq('bar')
+      expect(baz).to.eq('baz')
+    })
+  })
+
+  describe('.then()', () => {
+    it('invokes a callback function with the current subject', () => {
+      // https://on.cypress.io/then
+      cy.get('.connectors-list > li')
+        .then(($lis) => {
+          expect($lis, '3 items').to.have.length(3)
+          expect($lis.eq(0), 'first item').to.contain('Walk the dog')
+          expect($lis.eq(1), 'second item').to.contain('Feed the cat')
+          expect($lis.eq(2), 'third item').to.contain('Write JavaScript')
+        })
+    })
+
+    it('yields the returned value to the next command', () => {
+      cy.wrap(1)
+        .then((num) => {
+          expect(num).to.equal(1)
+
+          return 2
+        })
+        .then((num) => {
+          expect(num).to.equal(2)
+        })
+    })
+
+    it('yields the original subject without return', () => {
+      cy.wrap(1)
+        .then((num) => {
+          expect(num).to.equal(1)
+          // note that nothing is returned from this callback
+        })
+        .then((num) => {
+          // this callback receives the original unchanged value 1
+          expect(num).to.equal(1)
+        })
+    })
+
+    it('yields the value yielded by the last Cypress command inside', () => {
+      cy.wrap(1)
+        .then((num) => {
+          expect(num).to.equal(1)
+          // note how we run a Cypress command
+          // the result yielded by this Cypress command
+          // will be passed to the second ".then"
+          cy.wrap(2)
+        })
+        .then((num) => {
+          // this callback receives the value yielded by "cy.wrap(2)"
+          expect(num).to.equal(2)
+        })
+    })
+  })
+})