Adds Playwright, first tests and linting.

This runs in your local database and is noisy! I'd rather run it with a separate database but that might be overkill, I don't know.

.eslintrc.json

@@ -9,5 +9,9 @@
     "camelcase": "off",
     "no-alert": "off",
     "vars-on-top": "warn"
-  }
+  },
+  "ignorePatterns": [
+    "e2e/*",
+    "playwright.config.js"
+  ]
 }

.eslintrc.playwright.json

@@ -0,0 +1,8 @@
+{
+  "env": {
+    "browser": true
+  },
+  "extends": [
+    "plugin:@wordpress/eslint-plugin/esnext"
+  ]
+}

.gitignore

@@ -21,3 +21,7 @@ alerts/js/*.min.js
 
 # Generated test data
 tests/data/tmp/*
+/test-results/
+/playwright-report/
+/blob-report/
+/playwright/.cache/

.vscode/extensions.json

@@ -2,6 +2,6 @@
   "recommendations": [
     "EditorConfig.EditorConfig",
     "felixfbecker.php-debug",
-    "ikappas.phpcs"
+    "ms-playwright.playwright"
   ]
 }

e2e/editor-new-post.spec.js

@@ -0,0 +1,63 @@
+import { test, expect } from '@wordpress/e2e-test-utils-playwright';
+import { v4 as uuidv4 } from 'uuid';
+
+test.describe( 'Editor: saving a new post', () => {
+	let page, postTitle, postId;
+
+	test.beforeAll( async ( { browser } ) => {
+		page = await browser.newPage();
+
+		const uuid = uuidv4();
+		postTitle = `Test Post ${ uuid }`; // Sometimes this runs more than once within a microsecond so it's a UUID.
+
+		// eslint-disable-next-line no-console
+		console.log( `New post ${ postTitle }` );
+
+		// Even though we're using WP's npm package, it's more straightforward to do it this way, at least for me in this environment.
+		await page.goto( 'http://stream.wpenv.net/wp-login.php?redirect_to=http://stream.wpenv.net/wp-admin/post-new.php%2F&reauth=1' );
+		await page.getByLabel( 'Username or Email Address' ).fill( 'admin' );
+		await page.getByLabel( 'Password', { exact: true } ).fill( 'password' );
+		await page.getByRole( 'button', { name: 'Log In' } ).click();
+		await page.getByLabel( 'Add title' ).click();
+		await page.getByLabel( 'Add title' ).fill( postTitle );
+		await page.getByLabel( 'Add title' ).press( 'Tab' );
+		await page.getByLabel( 'Empty block; start writing or' ).fill( 'I\'m a test post' );
+		await page.getByRole( 'button', { name: 'Publish', exact: true } ).click();
+
+		postId = await page.locator( 'input#post_ID' ).inputValue();
+
+		// eslint-disable-next-line no-console
+		console.log( `Post ID: ${ postId }` );
+
+		// We need to wait for both of the editor responses! The post saves to the posts table then the metadata saves to postmeta.
+		await Promise.all( [
+			page.waitForResponse( ( resp ) => resp.url().includes( 'meta-box-loader' ) && resp.status() === 302 ),
+			page.waitForResponse( ( resp ) => resp.url().includes( `wp-json/wp/v2/posts/${ postId }` ) && resp.status() === 200 ),
+			page.getByLabel( 'Editor publish' ).getByRole( 'button', { name: 'Publish', exact: true } ).click(),
+		] );
+
+		// They are too much in the posts table so I'm deleting them.
+		await page.goto( 'http://stream.wpenv.net/wp-admin/edit.php?post_type=post' );
+		const listTable = page.getByRole( 'table', { name: 'Table ordered by' } );
+		await expect( listTable ).toBeVisible();
+
+		// Move post to trash.
+		await listTable.getByRole( 'link', { name: `“${ postTitle }” (Edit)` } ).hover();
+		await listTable.getByRole( 'link', { name: `Move “${ postTitle }” to the Trash` } ).click();
+
+		// Ok, we're all set up, let's go to our page.
+		await page.goto( 'http://stream.wpenv.net/wp-admin/admin.php?page=wp_stream' );
+	} );
+
+	// Do we have a published row?
+	test( 'has published row', async () => {
+		// Expects Stream log to have "Test Post" post published visible.
+		await expect( page.getByText( `"${ postTitle }" post published` ) ).toBeVisible();
+	} );
+
+	// We should not have an updated row. This times out which makes it fail.
+	test( 'does not have updated row', async () => {
+		// Expects Stream log to have "Test Post" post published visible.
+		await expect( page.getByText( `"${ postTitle }" post updated` ) ).not.toBeVisible();
+	} );
+} );