Add E2E tests for shared blocks

Tests the following shared block flows:

- Converting a block to a shared block, naming it, saving
- Converting a block to a shared block, saving
- Inserting a shared block, renaming it, editing it, saving
- Converting a shared block to a regular block
- Deleting a shared block

test/e2e/specs/shared-blocks.test.js

@@ -0,0 +1,207 @@
+/**
+ * Internal dependencies
+ */
+import '../support/bootstrap';
+import {
+	insertBlock,
+	newDesktopBrowserPage,
+	newPost,
+	pressWithModifier,
+	searchForBlock,
+} from '../support/utils';
+
+function waitForAndAcceptDialog() {
+	return new Promise( ( resolve ) => {
+		page.once( 'dialog', async ( dialog ) => {
+			await dialog.accept();
+			resolve();
+		} );
+	} );
+}
+
+describe( 'Shared Blocks', () => {
+	beforeAll( async () => {
+		await newDesktopBrowserPage();
+		await newPost();
+	} );
+
+	beforeEach( async () => {
+		// Remove all blocks from the post so that we're working with a clean slate
+		await page.evaluate( () => {
+			const blocks = wp.data.select( 'core/editor' ).getBlocks();
+			const uids = blocks.map( ( block ) => block.uid );
+			wp.data.dispatch( 'core/editor' ).removeBlocks( uids );
+		} );
+	} );
+
+	it( 'can be created', async () => {
+		// Insert a paragraph block
+		await insertBlock( 'Paragraph' );
+		await page.keyboard.type( 'Hello there!' );
+
+		// Trigger isTyping = false
+		await page.mouse.move( 200, 300 );
+		await page.mouse.move( 250, 350 );
+
+		// Convert block to a shared block
+		await page.click( 'button[aria-label="More Options"]' );
+		const convertButton = await page.waitForXPath( '//button[text()="Convert to Shared Block"]' );
+		await convertButton.click();
+
+		// Wait for creation to finish
+		await page.waitForXPath(
+			'//*[contains(@class, "notice-success")]/*[text()="Block created."]'
+		);
+
+		// Select all of the text in the title field by triple-clicking on it. We
+		// triple-click because, on Mac, Mod+A doesn't work. This should be
+		// unnecessary when [TODO: create issue] is fixed
+		await page.click( '.shared-block-edit-panel__title', { clickCount: 3 } );
+
+		// Give the shared block a title
+		await page.keyboard.type( 'Greeting block' );
+
+		// Save the shared block
+		const [ saveButton ] = await page.$x( '//button[text()="Save"]' );
+		await saveButton.click();
+
+		// Wait for saving to finish
+		await page.waitForXPath( '//button[text()="Edit"]' );
+
+		// Check that we have a shared block on the page
+		const block = await page.$( '.editor-block-list__block[data-type="core/block"]' );
+		expect( block ).not.toBeNull();
+
+		// Check that its title is displayed
+		const title = await page.$eval(
+			'.shared-block-edit-panel__info',
+			( element ) => element.innerText
+		);
+		expect( title ).toBe( 'Greeting block' );
+	} );
+
+	it( 'can be created with no title', async () => {
+		// Insert a paragraph block
+		await insertBlock( 'Paragraph' );
+		await page.keyboard.type( 'Hello there!' );
+
+		// Trigger isTyping = false
+		await page.mouse.move( 200, 300 );
+		await page.mouse.move( 250, 350 );
+
+		// Convert block to a shared block
+		await page.click( 'button[aria-label="More Options"]' );
+		const convertButton = await page.waitForXPath( '//button[text()="Convert to Shared Block"]' );
+		await convertButton.click();
+
+		// Wait for creation to finish
+		await page.waitForXPath(
+			'//*[contains(@class, "notice-success")]/*[text()="Block created."]'
+		);
+
+		// Save the shared block
+		const [ saveButton ] = await page.$x( '//button[text()="Save"]' );
+		await saveButton.click();
+
+		// Wait for saving to finish
+		await page.waitForXPath( '//button[text()="Edit"]' );
+
+		// Check that we have a shared block on the page
+		const block = await page.$( '.editor-block-list__block[data-type="core/block"]' );
+		expect( block ).not.toBeNull();
+
+		// Check that it is untitled
+		const title = await page.$eval(
+			'.shared-block-edit-panel__info',
+			( element ) => element.innerText
+		);
+		expect( title ).toBe( 'Untitled shared block' );
+	} );
+
+	it( 'can be inserted and edited', async () => {
+		// Insert the shared block we created above
+		await insertBlock( 'Greeting block' );
+
+		// Put the shared block in edit mode
+		const [ editButton ] = await page.$x( '//button[text()="Edit"]' );
+		await editButton.click();
+
+		// Change the block's title
+		await page.keyboard.type( 'Surprised greeting block' );
+
+		// Change the block's content
+		await pressWithModifier( 'Shift', 'Tab' );
+		await page.keyboard.type( 'Oh! ' );
+
+		// Save the shared block
+		const [ saveButton ] = await page.$x( '//button[text()="Save"]' );
+		await saveButton.click();
+
+		// Wait for saving to finish
+		await page.waitForXPath( '//button[text()="Edit"]' );
+
+		// Check that we have a shared block on the page
+		const block = await page.$( '.editor-block-list__block[data-type="core/block"]' );
+		expect( block ).not.toBeNull();
+
+		// Check that its title is displayed
+		const title = await page.$eval(
+			'.shared-block-edit-panel__info',
+			( element ) => element.innerText
+		);
+		expect( title ).toBe( 'Surprised greeting block' );
+
+		// Check that its content is up to date
+		const text = await page.$eval(
+			'.editor-block-list__block[data-type="core/block"] .editor-rich-text',
+			( element ) => element.innerText
+		);
+		expect( text ).toMatch( 'Oh! Hello there!' );
+	} );
+
+	it( 'can be converted to a regular block', async () => {
+		// Insert the shared block we edited above
+		await insertBlock( 'Surprised greeting block' );
+
+		// Convert block to a regular block
+		await page.click( 'button[aria-label="More Options"]' );
+		const convertButton = await page.waitForXPath(
+			'//button[text()="Convert to Regular Block"]'
+		);
+		await convertButton.click();
+
+		// Check that we have a paragraph block on the page
+		const block = await page.$( '.editor-block-list__block[data-type="core/paragraph"]' );
+		expect( block ).not.toBeNull();
+
+		// Check that its content is up to date
+		const text = await page.$eval(
+			'.editor-block-list__block[data-type="core/paragraph"] .editor-rich-text',
+			( element ) => element.innerText
+		);
+		expect( text ).toMatch( 'Oh! Hello there!' );
+	} );
+
+	it( 'can be deleted', async () => {
+		// Insert the shared block we edited above
+		await insertBlock( 'Surprised greeting block' );
+
+		// Delete the block and accept the confirmation dialog
+		await page.click( 'button[aria-label="More Options"]' );
+		const convertButton = await page.waitForXPath( '//button[text()="Delete Shared Block"]' );
+		await Promise.all( [ waitForAndAcceptDialog(), convertButton.click() ] );
+
+		// Check that we have an empty post again
+		const block = await page.$$( '.editor-block-list__block' );
+		expect( block ).toHaveLength( 0 );
+
+		// Search for the block in the inserter
+		await searchForBlock( 'Surprised greeting block' );
+
+		// Check that we couldn't find it
+		const items = await page.$$(
+			'.editor-block-types-list__item[aria-label="Surprised greeting block"]'
+		);
+		expect( items ).toHaveLength( 0 );
+	} );
+} );