Add test case for parent parameters.

tests/e2e/api-core-tests/data/products.js

@@ -1482,6 +1482,22 @@ const createSampleVariableProducts = async ( categories, attributes ) => {
 	] );
 };
 
+const createSampleHierarchicalProducts = async () => {
+	const { body: parent } = await createProduct( {
+		name: 'Parent Product',
+	} );
+
+	const { body: child } = await createProduct( {
+		name: 'Child Product',
+		parent_id: parent.id,
+	} );
+
+	return {
+		parent,
+		child,
+	}
+};
+
 const createSampleProducts = async () => {
 	const categories = await createSampleCategories();
 	const attributes = await createSampleAttributes();
@@ -1494,6 +1510,7 @@ const createSampleProducts = async () => {
 	await createSampleExternalProducts( categories );
 	await createSampleGroupedProduct( categories );
 	await createSampleVariableProducts( categories, attributes );
+	await createSampleHierarchicalProducts();
 };
 
 module.exports = {

tests/e2e/api-core-tests/tests/products/products.test.js

@@ -446,5 +446,27 @@ const { getRequest } = require( '../../utils/request' );
 			expect( result.body ).toHaveLength( coolProducts.length );
 			expect( result.body ).toEqual( expect.arrayContaining( coolProducts ) );
 		} );
+
+		it( 'parent', async () => {
+			const result1 = await productsApi.listAll.products( {
+				search: 'Parent Product'
+			} );
+			expect( result1.body ).toHaveLength( 1 );
+	
+			const result2 = await productsApi.listAll.products( {
+				parent: result1.body[0].id,
+			} );
+			expect( result2.statusCode ).toEqual( 200 );
+			expect( result2.body ).toHaveLength( 1 );
+			expect( result2.body[0].name ).toBe( 'Child Product' );
+
+			const result3 = await productsApi.listAll.products( {
+				parent_exclude: result1.body[0].id,
+			} );
+			expect( result3.statusCode ).toEqual( 200 );
+			expect( result3.body ).toEqual( expect.not.arrayContaining( [
+				expect.objectContaining( { name: 'Child Product' } ),
+			] ) );
+		} );
 	} );
 } );