Storybook: Add stories for BlockInspector component.

packages/block-editor/src/components/block-inspector/stories/index.story.js

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+/**
+ * WordPress dependencies
+ */
+import { registerCoreBlocks } from '@wordpress/block-library';
+import { createBlock } from '@wordpress/blocks';
+import { useDispatch } from '@wordpress/data';
+import { useEffect } from '@wordpress/element';
+import { store as blockEditorStore } from '@wordpress/block-editor';
+
+/**
+ * Internal dependencies
+ */
+import { ExperimentalBlockEditorProvider } from '../../provider';
+import BlockInspector from '../';
+
+registerCoreBlocks();
+
+const blocks = [ createBlock( 'core/paragraph' ) ];
+
+const BlockSelector = ( { children, clientId } ) => {
+	const { selectBlock } = useDispatch( blockEditorStore );
+
+	useEffect( () => {
+		if ( clientId ) {
+			selectBlock( clientId );
+		}
+	}, [ clientId, selectBlock ] );
+
+	return children;
+};
+
+const meta = {
+	title: 'BlockEditor/BlockInspector',
+	component: BlockInspector,
+	parameters: {
+		docs: {
+			canvas: { sourceState: 'shown' },
+			description: {
+				component:
+					'The Block inspector is one of the panels that is displayed in the editor; it is mainly used to view and modify the settings of the selected block.',
+			},
+		},
+	},
+	decorators: [
+		( Story ) => (
+			<ExperimentalBlockEditorProvider value={ blocks }>
+				<Story />
+			</ExperimentalBlockEditorProvider>
+		),
+	],
+	argTypes: {
+		showNoBlockSelectedMessage: {
+			control: 'boolean',
+			description:
+				'Determines whether the Block Inspector displays a "No block selected" message or not when no block is selected.',
+			table: {
+				type: { summary: 'boolean' },
+				defaultValue: { summary: 'true' },
+			},
+		},
+	},
+};
+
+export default meta;
+
+export const Default = {};
+
+export const WithSelectedBlock = {
+	decorators: [
+		( Story ) => (
+			<ExperimentalBlockEditorProvider value={ blocks }>
+				<BlockSelector clientId={ blocks[ 0 ].clientId }>
+					<Story />
+				</BlockSelector>
+			</ExperimentalBlockEditorProvider>
+		),
+	],
+};