feat: Disable slash commands for encrypted rooms

apps/meteor/tests/e2e/e2e-encryption.spec.ts

@@ -239,6 +239,44 @@
 		await expect(poHomeChannel.content.lastUserMessage.locator('.rcx-icon--name-key')).toBeVisible();
 	});
 
+	test.describe('un-encrypted messages not allowed in e2ee rooms', () => {
+		let poHomeChannel: HomeChannel;
+
+		test.beforeEach(async ({ page }) => {
+			poHomeChannel = new HomeChannel(page);
+			await page.goto('/home');
+		});
+		test.beforeAll(async ({ api }) => {
+			expect((await api.post('/settings/E2E_Allow_Unencrypted_Messages', { value: false })).status()).toBe(200);
+		});
+
+		test.afterAll(async ({ api }) => {
+			expect((await api.post('/settings/E2E_Allow_Unencrypted_Messages', { value: false })).status()).toBe(200);
+		});
+
+		test('expect slash commands to be disabled in an e2ee room', async ({ page }) => {
+			await restoreState(page, Users.admin);
+			const channelName = faker.string.uuid();
+
+			await poHomeChannel.sidenav.createEncryptedChannel(channelName);
+
+			await expect(page).toHaveURL(`/group/${channelName}`);
+
+			await poHomeChannel.dismissToast();
+
+			await expect(poHomeChannel.content.encryptedRoomHeaderIcon).toBeVisible();
+
+			await poHomeChannel.content.sendMessage('This is an encrypted message.');
+
+			await expect(poHomeChannel.content.lastUserMessageBody).toHaveText('This is an encrypted message.');
+			await expect(poHomeChannel.content.lastUserMessage.locator('.rcx-icon--name-key')).toBeVisible();
+
+			await page.locator('[name="msg"]').type('/');
+			await expect(page.locator('#popup-item-contextualbar')).toHaveClass(/disabled/)
+
+		});
+	});
+
 	test.describe('reset keys', () => {
 		let anotherClientPage: Page;