Improve Features block stability through transforms testing (#1189)

* add features block transform tests

* remove extra imports

src/blocks/features/test/transforms.spec.js

@@ -0,0 +1,35 @@
+/**
+ * External dependencies
+ */
+import { registerBlockType } from '@wordpress/blocks';
+
+/**
+ * Internal dependencies.
+ */
+import * as helpers from '../../../../.dev/tests/jest/helpers';
+import { name, settings } from '../index';
+
+describe( 'coblocks/features transforms', () => {
+	beforeAll( () => {
+		// Register the block.
+		registerBlockType( name, { category: 'common', ...settings } );
+	} );
+
+	it( 'should transform when :feature prefix is seen', () => {
+		const block = helpers.performPrefixTransformation( name, ':feature', ':feature' );
+		expect( block.isValid ).toBe( true );
+		expect( block.name ).toBe( name );
+		expect( block.attributes.columns ).toBe( 1 ); // should be single column.
+	} );
+
+	// Should allow transform when prefixed with 1-3 colons.
+	for ( let i = 1; i <= 3; i++ ) {
+		const prefix = Array( i + 1 ).join( ':' ) + 'features';
+		it( `should transform when ${ prefix } prefix is seen`, () => {
+			const block = helpers.performPrefixTransformation( name, prefix, prefix );
+			expect( block.isValid ).toBe( true );
+			expect( block.name ).toBe( name );
+			expect( block.attributes.columns ).toBe( Math.max( i, 2 ) ); // should be 2 minimum columns or 3 max.
+		} );
+	}
+} );