Add initial e2e tests to Mini Cart block (#4677)

Author: Aljullu

tests/e2e/specs/backend/__fixtures__/mini-cart.fixture.json

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+{"title":"Mini Cart Block","pageContent":"<!-- wp:woocommerce/mini-cart /-->"}

tests/e2e/specs/backend/mini-cart.test.js

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+/**
+ * External dependencies
+ */
+import { switchUserToAdmin, getAllBlocks } from '@wordpress/e2e-test-utils';
+import { visitBlockPage } from '@woocommerce/blocks-test-utils';
+
+/**
+ * Internal dependencies
+ */
+import { insertBlockDontWaitForInsertClose } from '../../utils.js';
+
+const block = {
+	name: 'Mini Cart',
+	slug: 'woocommerce/mini-cart',
+	class: '.wc-block-mini-cart',
+};
+
+if ( process.env.WOOCOMMERCE_BLOCKS_PHASE < 3 ) {
+	// eslint-disable-next-line jest/no-focused-tests
+	test.only( `skipping ${ block.name } tests`, () => {} );
+}
+
+describe( `${ block.name } Block`, () => {
+	beforeAll( async () => {
+		await switchUserToAdmin();
+		await visitBlockPage( `${ block.name } Block` );
+	} );
+
+	it( 'can only be inserted once', async () => {
+		await insertBlockDontWaitForInsertClose( block.name );
+		expect( await getAllBlocks() ).toHaveLength( 1 );
+	} );
+
+	it( 'renders without crashing', async () => {
+		await expect( page ).toRenderBlock( block );
+	} );
+} );