Add unit test for checking that status has the correct value.

plugins/woocommerce/tests/php/src/Internal/DataStores/Orders/OrdersTableDataStoreTests.php

@@ -2132,4 +2132,20 @@ class OrdersTableDataStoreTests extends WC_Unit_Test_Case {
 
 		$this->assertEquals( 1, $result );
 	}
+
+	/**
+	 * @testDox When saving an order, status is automatically prefixed even if it was not earlier.
+	 */
+	public function test_get_db_row_from_order_only_prefixed_status_is_written_to_db() {
+		$order = wc_create_order();
+
+		$order->set_status( 'completed' );
+		$db_row_callback = function ( $order, $only_changes ) {
+			return $this->get_db_row_from_order( $order, $this->order_column_mapping, $only_changes );
+		};
+
+		$db_row = $db_row_callback->call( $this->sut, $order, false );
+
+		$this->assertEquals( 'wc-completed', $db_row['data']['status'] );
+	}
 }