Playwright test for pasting files (#33350)

* Add tests for pasting

* Add tests for pasting files.

* Remove redundant fn

* rm comment

apps/web/playwright/e2e/composer/RTE.spec.ts

@@ -8,6 +8,7 @@ Please see LICENSE files in the repository root for full details.
 
 import { test, expect } from "../../element-web-test";
 import { SettingLevel } from "../../../src/settings/SettingLevel";
+import { getSampleFilePath } from "../../sample-files";
 
 const CtrlOrMeta = process.platform === "darwin" ? "Meta" : "Control";
 
@@ -195,6 +196,26 @@ test.describe("Composer", () => {
             await expect(page.locator(".mx_EventTile_body strong").getByText("bold")).toBeVisible();
         });
 
+        test("can paste a file", async ({ page, bot, app }) => {
+            await app.composerDragAndPasteFile("room", getSampleFilePath("riot.png"), "image/png");
+            await expect(page.locator(".mx_MImageBody")).toBeVisible();
+        });
+
+        test("can paste a file in a thread", async ({ page, app }) => {
+            // Send a message
+            const composer = page.locator("div[contenteditable=true]");
+            await composer.pressSequentially("my first message");
+            await page.getByRole("button", { name: "Send message" }).click();
+
+            // Click reply
+            const tile = page.locator(".mx_EventTile_last");
+            await tile.hover();
+            await tile.getByRole("button", { name: "Reply in thread" }).click();
+
+            await app.composerDragAndPasteFile("thread", getSampleFilePath("riot.png"), "image/png");
+            await expect(page.locator(".mx_MImageBody")).toBeVisible();
+        });
+
         test.describe("when Control+Enter is required to send", () => {
             test.beforeEach(async ({ app }) => {
                 await app.settings.setValue("MessageComposerInput.ctrlEnterToSend", null, SettingLevel.ACCOUNT, true);