added e2e tests (#298)

- added e2e tests for
  - banner
  - history
  - intro
  - language
  - link
- added e2e workflow
- added cypress badge to README

cypress/integration/link.spec.ts

@@ -0,0 +1,165 @@
+import '../support/index'
+
+describe('Links Intro', () => {
+  beforeEach(() => {
+    cy.visit('/')
+  })
+
+  describe('Cover Buttons', () => {
+    beforeEach(() => {
+      cy.logout()
+    })
+
+    it('Sign in Cover Button', () => {
+      cy.get('.cover-button.btn-success')
+        .click()
+      cy.url()
+        .should('include', '/login')
+    })
+
+    it('Features Cover Button', () => {
+      cy.get('.cover-button.btn-primary')
+        .click()
+      cy.url()
+        .should('include', '/features')
+    })
+  })
+
+  it('History', () => {
+    cy.get('#navLinkHistory')
+      .click()
+    cy.url()
+      .should('include', '/history')
+    cy.get('#navLinkIntro')
+      .click()
+    cy.url()
+      .should('include', '/intro')
+  })
+
+  describe('Menu Buttons logged out', () => {
+    beforeEach(() => {
+      cy.logout()
+    })
+
+    it('New guest note', () => {
+      cy.get('.d-inline-flex.btn-primary')
+        .click()
+      cy.url()
+        .should('include', '/new')
+    })
+
+    it('Sign In', () => {
+      cy.get('.btn-success.btn-sm')
+        .click()
+      cy.url()
+        .should('include', '/login')
+    })
+  })
+
+  describe('Menu Buttons logged in', () => {
+    it('New note', () => {
+      cy.get('.d-inline-flex.btn-primary').click()
+      cy.url()
+        .should('include', '/new')
+    })
+
+    describe('User Menu', () => {
+      beforeEach(() => {
+        cy.get('#dropdown-user').click()
+      })
+
+      it('Features', () => {
+        cy.get('a.dropdown-item > i.fa-bolt')
+          .click()
+        cy.url()
+          .should('include', '/features')
+      })
+
+      it('Features', () => {
+        cy.get('a.dropdown-item > i.fa-user')
+          .click()
+        cy.url()
+          .should('include', '/profile')
+      })
+    })
+  })
+
+  describe('Feature Links', () => {
+    it('Share-Notes', () => {
+      cy.get('i.fa-bolt.fa-3x')
+        .click()
+      cy.url()
+        .should('include', '/features#Share-Notes')
+    })
+
+    it('MathJax', () => {
+      cy.get('i.fa-bar-chart.fa-3x')
+        .click()
+      cy.url()
+        .should('include', '/features#MathJax')
+    })
+
+    it('Slide-Mode', () => {
+      cy.get('i.fa-television.fa-3x')
+        .click()
+      cy.url()
+        .should('include', '/features#Slide-Mode')
+    })
+  })
+
+  describe('Powered By Links', () => {
+    it('CodiMD', () => {
+      cy.get('a[href="https://codimd.org"]')
+        .checkExternalLink('https://codimd.org')
+    })
+
+    it('Releases', () => {
+      cy.get('a[href*="/n/release-notes"]')
+        .click()
+      cy.url()
+        .should('include', '/n/release-notes')
+    })
+
+    it('Privacy', () => {
+      cy.get('a[href="https://example.com/privacy"]')
+        .checkExternalLink('https://example.com/privacy')
+    })
+
+    it('TermsOfUse', () => {
+      cy.get('a[href="https://example.com/termsOfUse"]')
+        .checkExternalLink('https://example.com/termsOfUse')
+    })
+
+    it('Imprint', () => {
+      cy.get('a[href="https://example.com/imprint"]')
+        .checkExternalLink('https://example.com/imprint')
+    })
+  })
+
+  describe('Follow us Links', () => {
+    it('Github', () => {
+      cy.get('a[href="https://github.com/codimd/server"]')
+        .checkExternalLink('https://github.com/codimd/server')
+    })
+
+    it('Discourse', () => {
+      cy.get('a[href="https://community.codimd.org"]')
+        .checkExternalLink('https://community.codimd.org')
+    })
+
+    it('Matrix', () => {
+      cy.get('a[href="https://riot.im/app/#/room/#codimd:matrix.org"]')
+        .checkExternalLink('https://riot.im/app/#/room/#codimd:matrix.org')
+    })
+
+    it('Mastodon', () => {
+      cy.get('a[href="https://social.codimd.org/mastodon"]')
+        .checkExternalLink('https://social.codimd.org/mastodon')
+    })
+
+    it('POEditor', () => {
+      cy.get('a[href="https://translate.codimd.org"]')
+        .checkExternalLink('https://translate.codimd.org')
+    })
+  })
+})