Add a basic test for shortcode transformation (#7823)

* Add a basic test for shortcode transformation

* Use `createBlock()` to generate a more predictable block

blocks/api/raw-handling/test/shortcode-converter.js

@@ -0,0 +1,38 @@
+/**
+ * WordPress dependences
+ */
+import { registerCoreBlocks } from '@wordpress/core-blocks';
+
+/**
+ * Internal dependencies
+ */
+import segmentHTMLToShortcodeBlock from '../shortcode-converter';
+import { createBlock } from '../../factory';
+
+describe( 'segmentHTMLToShortcodeBlock', () => {
+	beforeAll( () => {
+		registerCoreBlocks();
+	} );
+
+	it( 'should convert a standalone shortcode between two paragraphs', () => {
+		const original = `<p>Foo</p>
+
+[foo bar="apple"]
+
+<p>Bar</p>`;
+		const transformed = segmentHTMLToShortcodeBlock( original, 0 );
+		expect( transformed ).toHaveLength( 3 );
+		expect( transformed[ 0 ] ).toBe( `<p>Foo</p>
+
+` );
+		const expectedBlock = createBlock( 'core/shortcode', {
+			text: '[foo bar="apple"]',
+		} );
+		// uuid will always be random.
+		expectedBlock.uid = transformed[ 1 ].uid;
+		expect( transformed[ 1 ] ).toEqual( expectedBlock );
+		expect( transformed[ 2 ] ).toBe( `
+
+<p>Bar</p>` );
+	} );
+} );