feat:add print test case

cypress/integration/menus/print.spec.ts

@@ -0,0 +1,29 @@
+import Editor from '../../../src/editor'
+
+describe('菜单-打印', () => {
+
+  beforeEach(() => {
+    cy.visit('http://localhost:3000/canvas-editor/')
+
+    cy.get('canvas').should('have.length', 2)
+  })
+
+  it('打印', () => {
+
+    cy.getEditor().then((editor: Editor) => {
+      const imageList2 = editor.command.getImage()
+      expect(imageList2.length).to.eq(2)
+
+      editor.command.executeSelectAll()
+
+      editor.command.executeBackspace()
+
+      cy.wait(200).then(() => {
+        const imageList1 = editor.command.getImage()
+        expect(imageList1.length).to.eq(1)
+      })
+    })
+
+  })
+
+})