Test cases for sorting

tests/unit-tests/core/taxonomies.php

@@ -0,0 +1,103 @@
+<?php
+/**
+ * Taxonomy tests class.
+ *
+ * @package WooCommerce\Tests\Core
+ */
+
+/**
+ * WC_Test_Taxonomies class.
+ */
+class WC_Test_Taxonomies extends WC_Unit_Test_Case {
+
+	/**
+	 * Setup test.
+	 */
+	public function setUp() {
+		parent::setUp();
+		$category_1 = wp_insert_term( 'Zulu Category', 'product_cat' );
+		$category_2 = wp_insert_term( 'Alpha Category', 'product_cat' );
+		$category_3 = wp_insert_term( 'Beta Category', 'product_cat' );
+		update_term_meta( $category_1['term_id'], 'order', 2 );
+		update_term_meta( $category_2['term_id'], 'order', 1 );
+		update_term_meta( $category_3['term_id'], 'order', 3 );
+	}
+
+	/**
+	 * Test get_terms sorting.
+	 */
+	public function test_get_terms_orderby() {
+		$default_category_id = absint( get_option( 'default_product_cat', 0 ) );
+
+		// Default sort (menu_order).
+		$terms = array_values(
+			wp_list_pluck(
+				get_terms(
+					array(
+						'taxonomy'   => 'product_cat',
+						'hide_empty' => false,
+						'exclude'    => $default_category_id,
+					)
+				),
+				'name'
+			)
+		);
+		$this->assertEquals(
+			array(
+				'Alpha Category',
+				'Zulu Category',
+				'Beta Category',
+			),
+			$terms,
+			print_r( $terms, true ) // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_print_r
+		);
+
+		// Force sort by name.
+		$terms = array_values(
+			wp_list_pluck(
+				get_terms(
+					array(
+						'taxonomy'   => 'product_cat',
+						'orderby'    => 'name',
+						'hide_empty' => false,
+						'exclude'    => $default_category_id,
+					)
+				),
+				'name'
+			)
+		);
+		$this->assertEquals(
+			array(
+				'Alpha Category',
+				'Beta Category',
+				'Zulu Category',
+			),
+			$terms,
+			print_r( $terms, true ) // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_print_r
+		);
+
+		// Force sort by ID.
+		$terms = array_values(
+			wp_list_pluck(
+				get_terms(
+					array(
+						'taxonomy'   => 'product_cat',
+						'orderby'    => 'term_id',
+						'hide_empty' => false,
+						'exclude'    => $default_category_id,
+					)
+				),
+				'name'
+			)
+		);
+		$this->assertEquals(
+			array(
+				'Zulu Category',
+				'Alpha Category',
+				'Beta Category',
+			),
+			$terms,
+			print_r( $terms, true ) // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_print_r
+		);
+	}
+}