add tests for a few core commands

tests/cypress/integration/core/clearContent.spec.ts

@@ -0,0 +1,36 @@
+/// <reference types="cypress" />
+
+import { Editor } from '@tiptap/core'
+import Document from '@tiptap/extension-document'
+import Paragraph from '@tiptap/extension-paragraph'
+import Text from '@tiptap/extension-text'
+
+describe('clearContent', () => {
+  it('returns true when clearing the content', () => {
+    const editor = new Editor({
+      extensions: [
+        Document,
+        Paragraph,
+        Text,
+      ],
+    })
+
+    const command = editor.commands.clearContent()
+
+    expect(command).to.be.true
+  })
+
+  it('clears the content when using clearContent', () => {
+    const editor = new Editor({
+      extensions: [
+        Document,
+        Paragraph,
+        Text,
+      ],
+    })
+
+    editor.commands.clearContent()
+
+    expect(editor.getHTML()).to.eq('<p></p>')
+  })
+})