Add test for saving and restoring cursor positions

tests/note-format.spec.js

@@ -0,0 +1,48 @@
+import { test, expect } from "@playwright/test";
+import { HeynotePage } from "./test-utils.js";
+import { NoteFormat } from "../src/editor/note-format.js";
+
+let heynotePage
+
+test.beforeEach(async ({ page }) => {
+    heynotePage = new HeynotePage(page)
+    await heynotePage.goto()
+});
+
+
+test("test restore cursor position", async ({ page, browserName }) => {
+    heynotePage.setContent(`{"formatVersion":"1.0", "cursors":{"ranges":[{"anchor":13,"head":13}],"main":0}}
+∞∞∞text
+Textblock`)
+    await page.locator("body").press((heynotePage.isMac ? "Meta" : "Control") +  "+Alt+Enter")
+    expect(await heynotePage.getContent()).toBe(`
+∞∞∞text
+Text
+∞∞∞text
+block`)
+})
+
+
+test("test save cursor positions", async ({ page, browserName }) => {
+    heynotePage.setContent(`{"formatVersion":"1.0", "cursors":{"ranges":[{"anchor":9,"head":9}],"main":0}}
+∞∞∞text
+this
+is
+a
+text
+block`)
+    await page.locator("body").press((heynotePage.isMac ? "Meta" : "Control") +  "+Alt+ArrowDown")
+    await page.locator("body").press((heynotePage.isMac ? "Meta" : "Control") +  "+Alt+ArrowDown")
+    await page.locator("body").press("Delete")
+    expect(await heynotePage.getContent()).toBe(`
+∞∞∞text
+his
+s
+
+text
+block`)
+
+    const bufferData = await heynotePage.getBufferData()
+    const note = NoteFormat.load(bufferData)
+    expect(note.cursors.ranges.length).toBe(3)
+})