Add tests for database table creation (https://github.com/woocommerce/woocommerce-admin/pull/6658)

plugins/woocommerce-admin/tests/install.php

@@ -0,0 +1,48 @@
+<?php
+/**
+ * Install tests
+ *
+ * @package WooCommerce\Admin\Tests
+ */
+
+use \Automattic\WooCommerce\Admin\Install;
+
+/**
+ * Tests for \Automattic\WooCommerce\Admin\Install class.
+ */
+class WC_Admin_Tests_Install extends WP_UnitTestCase {
+
+	/**
+	 * Integration test for database table creation.
+	 *
+	 * @group database
+	 */
+	function test_create_tables() {
+		global $wpdb;
+
+		// List of tables created by Install::test_create_tables.
+		$tables = array(
+			"{$wpdb->prefix}wc_order_stats",
+			"{$wpdb->prefix}wc_order_product_lookup",
+			"{$wpdb->prefix}wc_order_tax_lookup",
+			"{$wpdb->prefix}wc_order_coupon_lookup",
+			"{$wpdb->prefix}wc_admin_notes",
+			"{$wpdb->prefix}wc_admin_note_actions",
+			"{$wpdb->prefix}wc_customer_lookup",
+			"{$wpdb->prefix}wc_category_lookup"
+		);
+
+		// Remove any existing tables in the environment.
+		$query = 'DROP TABLES IF EXISTS' . implode( ',', $tables );
+		$wpdb->query( $query );
+
+		// Try to create the tables.
+		Install::create_tables();
+		$result = $wpdb->get_col( "SHOW TABLES LIKE '{$wpdb->prefix}%'" );
+
+		// Check all the tables exist.
+		foreach ( $tables as $table ) {
+			$this->assertContains( $table, $result );
+		}
+	}
+}