add tests to the paragraph extension

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

@@ -1,5 +1,32 @@
 context('/api/extensions/paragraph', () => {
   beforeEach(() => {
     cy.visit('/api/extensions/paragraph')
+
+    cy.get('.ProseMirror').window().then(window => {
+      const { editor } = window
+      editor.clearContent()
+    })
+  })
+
+  describe('paragraph', () => {
+    it('text should be wrapped in a paragraph by default', () => {
+      cy.get('.ProseMirror').type('Example Text', {force: true})
+      cy.get('.ProseMirror').contains('p', 'Example Text')
+      cy.get('.ProseMirror').find('p').should('have.length', 1)
+    })
+
+    it('enter should make a new paragraph', () => {
+      cy.get('.ProseMirror').type('First Paragraph{enter}Second Paragraph', {force: true})
+      cy.get('.ProseMirror').find('p').should('have.length', 2)
+      cy.get('.ProseMirror').contains('p:first', 'First Paragraph')
+      cy.get('.ProseMirror').contains('p:nth-child(2)', 'Second Paragraph')
+    })
+
+    it('backspace should remove the second paragraph', () => {
+      cy.get('.ProseMirror').type('{enter}', {force: true})
+      cy.get('.ProseMirror').find('p').should('have.length', 2)
+      cy.get('.ProseMirror').type('{backspace}', {force: true})
+      cy.get('.ProseMirror').find('p').should('have.length', 1)
+    })
   })
 })