Issue: Multiple nodes should become one code block

docs/src/demos/Nodes/CodeBlock/index.spec.js

@@ -51,6 +51,21 @@ context('/demos/Nodes/CodeBlock', () => {
       .should('not.exist')
   })
 
+  it.only('transforms multiple nodes to one code block', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.commands.setContent('<p>Example paragraph</p><p>Another example paragraph</p>')
+      editor.commands.selectAll()
+    })
+
+    cy.get('.demo__preview button:first')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('pre')
+      .its('length')
+      .should('eq', 1)
+  })
+
   it('the keyboard shortcut should make the selected line a code block', () => {
     cy.get('.ProseMirror')
       .trigger('keydown', { modKey: true, altKey: true, key: 'c' })