add some tests

packages/tiptap-core/src/commands/insertText.ts

@@ -0,0 +1,12 @@
+import { Editor } from '../Editor'
+
+declare module "../Editor" {
+  interface Editor {
+    insertText(text: string): Editor,
+  }
+}
+
+export default function insertText(next: Function, { state, view }: Editor, text: string): void {
+  view.dispatch(state.tr.insertText(text))
+  next()
+}