cypress: paste html example test (#4439)

cypress/integration/examples/paste-html.ts

@@ -0,0 +1,29 @@
+describe('paste html example', () => {
+  beforeEach(() => cy.visit('examples/paste-html'))
+
+  const createHtmlPasteEvent = (htmlContent: string) =>
+    Object.assign(new Event('paste', { bubbles: true, cancelable: true }), {
+      clipboardData: {
+        getData: (type = 'text/html') => htmlContent,
+        types: ['text/html'],
+      },
+    })
+
+  const cyNewPasteHtml = (htmlContent: string) =>
+    cy
+      .findByRole('textbox')
+      .type('{selectall}')
+      .trigger('paste', createHtmlPasteEvent(htmlContent))
+
+  it('pasted bold text uses <strong>', () => {
+    cyNewPasteHtml('<strong>Hello Bold</strong>')
+      .get('strong')
+      .should('contain.text', 'Hello')
+  })
+
+  it('pasted code uses <code>', () => {
+    cyNewPasteHtml('<code>console.log("hello from slate!")</code>')
+      .get('code')
+      .should('contain.text', 'slate!')
+  })
+})