Introduce a generic clearEditors helper function

This replaces the various copies of this logic with a single helper that
we template for each editor type, similar to what we already do for the
`switchToEditor` helper.

test/integration/freetext_editor_spec.mjs

@@ -15,6 +15,7 @@
 
 import {
   awaitPromise,
+  clearEditors,
   closePages,
   copy,
   copyToClipboard,
@@ -59,13 +60,7 @@ import { PNG } from "pngjs";
 
 const selectAll = selectEditors.bind(null, "freeText");
 
-const clearAll = async page => {
+const clearAll = clearEditors.bind(null, "freeText");
-  await selectAll(page);
-  await page.keyboard.down("Control");
-  await page.keyboard.press("Backspace");
-  await page.keyboard.up("Control");
-  await waitForStorageEntries(page, 0);
-};
 
 const commit = async page => {
   await page.keyboard.press("Escape");

test/integration/ink_editor_spec.mjs

@@ -15,6 +15,7 @@
 
 import {
   awaitPromise,
+  clearEditors,
   closePages,
   dragAndDrop,
   getAnnotationSelector,
@@ -42,11 +43,7 @@ import {
 
 const selectAll = selectEditors.bind(null, "ink");
 
-const clearAll = async page => {
+const clearAll = clearEditors.bind(null, "ink");
-  await selectAll(page);
-  await page.keyboard.press("Backspace");
-  await waitForStorageEntries(page, 0);
-};
 
 const commit = async page => {
   await page.keyboard.press("Escape");

test/integration/stamp_editor_spec.mjs

@@ -17,6 +17,7 @@ import {
   applyFunctionToEditor,
   awaitPromise,
   cleanupEditing,
+  clearEditors,
   clearInput,
   closePages,
   copy,
@@ -38,7 +39,6 @@ import {
   pasteFromClipboard,
   scrollIntoView,
   selectEditor,
-  selectEditors,
   serializeBitmapDimensions,
   switchToEditor,
   unselectEditor,
@@ -47,7 +47,6 @@ import {
   waitForEntryInStorage,
   waitForSelectedEditor,
   waitForSerialized,
-  waitForStorageEntries,
   waitForTimeout,
 } from "./test_utils.mjs";
 import { fileURLToPath } from "url";
@@ -57,13 +56,7 @@ import { PNG } from "pngjs";
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
-const selectAll = selectEditors.bind(null, "stamp");
+const clearAll = clearEditors.bind(null, "stamp");
-
-const clearAll = async page => {
-  await selectAll(page);
-  await page.keyboard.press("Backspace");
-  await waitForStorageEntries(page, 0);
-};
 
 const waitForImage = async (page, selector) => {
   await page.waitForSelector(`${selector} canvas`);

test/integration/test_utils.mjs

@@ -816,6 +816,12 @@ async function selectEditors(name, page) {
   );
 }
 
+async function clearEditors(name, page) {
+  await selectEditors(name, page);
+  await page.keyboard.press("Backspace");
+  await waitForStorageEntries(page, 0);
+}
+
 function waitForNoElement(page, selector) {
   return page.waitForFunction(
     sel => !document.querySelector(sel),
@@ -888,6 +894,7 @@ export {
   applyFunctionToEditor,
   awaitPromise,
   cleanupEditing,
+  clearEditors,
   clearInput,
   closePages,
   closeSinglePage,