Define the piston test independent variable (#485)

ChrisRackauckas-Claude · ChrisRackauckas · web-flow · commit 65f80952c764 · 2026-07-13T20:00:48.000Z
Co-authored-by: ChrisRackauckas-Claude &lt;accounts@chrisrackauckas.com&gt;
diff --git 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
