From 55bc8802585d2631cea4e8a9ff10c8c32af4fbe6 Mon Sep 17 00:00:00 2001
From: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>
Date: Mon, 13 Jul 2026 10:40:35 -0400
Subject: [PATCH] Define the piston test independent variable

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
---
 test/piston.jl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/test/piston.jl b/test/piston.jl
index a6bd0985..7dccc85a 100644
--- a/test/piston.jl
+++ b/test/piston.jl
@@ -1,9 +1,12 @@
 using ModelingToolkit, Test
+using ModelingToolkitBase: @independent_variables
 using SciCompDSL
 using SciMLBase
 using ModelingToolkitStandardLibrary.Thermal
 using ModelingToolkitStandardLibrary.Blocks
 
+@independent_variables t
+
 # Tests ConvectiveResistor and includes FixedTemperature and ThermalResistor
 
 @testset "Piston cylinder wall" begin