copy tests to the React default example

docs/src/demos/Examples/Default/React/index.spec.js

@@ -0,0 +1,22 @@
+context('/demos/Examples/Default/React', () => {
+  before(() => {
+    cy.visit('/demos/Examples/Default/React')
+  })
+
+  beforeEach(() => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.commands.setContent('<h1>Example Text</h1>')
+      cy.get('.ProseMirror').type('{selectall}')
+    })
+  })
+
+  it('should apply the paragraph style when the keyboard shortcut is pressed', () => {
+    cy.get('.ProseMirror h1').should('exist')
+    cy.get('.ProseMirror p').should('not.exist')
+
+    cy.get('.ProseMirror')
+      .trigger('keydown', { modKey: true, altKey: true, key: '0' })
+      .find('p')
+      .should('contain', 'Example Text')
+  })
+})