add ordered list and list item

docs/src/demos/Extensions/OrderedList/index.spec.js

@@ -0,0 +1,97 @@
+context('/api/extensions/ordered-list', () => {
+  before(() => {
+    cy.visit('/api/extensions/ordered-list')
+  })
+
+  beforeEach(() => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p>Example Text</p>')
+      editor.selectAll()
+    })
+  })
+
+  it('the button should make the selected line a ordered list item', () => {
+    cy.get('.ProseMirror ol')
+      .should('not.exist')
+
+    cy.get('.ProseMirror ol li')
+      .should('not.exist')
+
+    cy.get('.demo__preview button:nth-child(1)')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('ol')
+      .should('contain', 'Example Text')
+
+    cy.get('.ProseMirror')
+      .find('ol li')
+      .should('contain', 'Example Text')
+  })
+
+  it('the button should toggle the ordered list', () => {
+    cy.get('.ProseMirror ol')
+      .should('not.exist')
+
+    cy.get('.demo__preview button:nth-child(1)')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('ol')
+      .should('contain', 'Example Text')
+
+    cy.get('.demo__preview button:nth-child(1)')
+      .click()
+
+    cy.get('.ProseMirror ol')
+      .should('not.exist')
+  })
+
+  it('should leave the list with double enter', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.clearContent()
+    })
+
+    cy.get('.ProseMirror')
+      .type('1. List Item 1{enter}{enter}Paragraph')
+
+    cy.get('.ProseMirror')
+      .find('li')
+      .its('length')
+      .should('eq', 1)
+
+    cy.get('.ProseMirror')
+      .find('p')
+      .should('contain', 'Paragraph')
+  })
+
+  it('should make a ordered list from a number', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.clearContent()
+    })
+
+    cy.get('.ProseMirror')
+      .type('1. List Item 1{enter}List Item 2')
+
+    cy.get('.ProseMirror')
+      .find('li:nth-child(1)')
+      .should('contain', 'List Item 1')
+
+    cy.get('.ProseMirror')
+      .find('li:nth-child(2)')
+      .should('contain', 'List Item 2')
+  })
+
+  it('should remove the ordered list after pressing backspace', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.clearContent()
+    })
+
+    cy.get('.ProseMirror')
+      .type('1. {backspace}Example')
+
+    cy.get('.ProseMirror')
+      .find('p')
+      .should('contain', '1. Example')
+  })
+})