Build/Test Tools: Add trash and restore of a single post e2e tests.

Adds an end-to-end (e2e) test case for:
* Emptying a post from the trash.
* Restoring a post from the trash.

Props pavanpatil1, pooja1210, justinahinon, kevin940726.
Fixes #54843.

git-svn-id: https://develop.svn.wordpress.org/trunk@52839 602fd350-edb4-49c9-b593-d223f7449a82

tests/e2e/specs/empty-trash-restore-trashed-posts.test.js

@@ -0,0 +1,72 @@
+import {
+  visitAdminPage,
+  createNewPost,
+  trashAllPosts,
+  publishPost,
+} from "@wordpress/e2e-test-utils";
+
+const POST_TITLE = "Test Title";
+
+describe("Empty Trash", () => {
+  async function createPost(title) {
+    // Create a Post
+    await createNewPost({ title });
+    await publishPost();
+  }
+
+  afterEach(async () => {
+    await trashAllPosts();
+  });
+
+  it("Empty Trash", async () => {
+    await createPost(POST_TITLE);
+
+    await visitAdminPage("/edit.php");
+
+    // Move post to trash
+    await page.hover(`[aria-label^="“${POST_TITLE}”"]`);
+    await page.click(`[aria-label='Move “${POST_TITLE}” to the Trash']`);
+
+    // Empty trash
+    const trashTab = await page.waitForXPath('//h2[text()="Filter posts list"]/following-sibling::ul//a[contains(text(), "Trash")]');
+    await Promise.all([
+      trashTab.click(),
+      page.waitForNavigation(),
+    ]);
+    const deleteAllButton = await page.waitForSelector('input[value="Empty Trash"]');
+    await Promise.all([
+      deleteAllButton.click(),
+      page.waitForNavigation(),
+    ]);
+
+    const messageElement = await page.waitForSelector("#message");
+    const message = await messageElement.evaluate((node) => node.innerText);
+    // Until we have `deleteAllPosts`, the number of posts being deleted could be dynamic.
+    expect(message).toMatch(/\d+ posts? permanently deleted\./);
+  });
+
+  it("Restore trash post", async () => {
+    await createPost(POST_TITLE);
+
+    await visitAdminPage("/edit.php");
+
+    // Move one post to trash.
+    await page.hover(`[aria-label^="“${POST_TITLE}”"]`);
+    await page.click(`[aria-label='Move “${POST_TITLE}” to the Trash']`);
+
+    // Remove post from trash.
+    const trashTab = await page.waitForXPath('//h2[text()="Filter posts list"]/following-sibling::ul//a[contains(text(), "Trash")]');
+    await Promise.all([
+      trashTab.click(),
+      page.waitForNavigation(),
+    ]);
+    const [postTitle] = await page.$x(`//*[text()="${POST_TITLE}"]`);
+    await postTitle.hover();
+    await page.click(`[aria-label="Restore “${POST_TITLE}” from the Trash"]`);
+
+    // Expect for success message for trashed post.
+    const messageElement = await page.waitForSelector("#message");
+    const message = await messageElement.evaluate((element) => element.innerText);
+    expect(message).toContain("1 post restored from the Trash.");
+  });
+});