diff --git a/test/test_examples_1d.jl b/test/test_examples_1d.jl
index 09dd828eab..112849f4c4 100644
--- a/test/test_examples_1d.jl
+++ b/test/test_examples_1d.jl
@@ -89,6 +89,10 @@ end
   @test_nowarn println(solver.mortar)
   @test_nowarn display(solver.mortar)
 
+  @test_nowarn show(solver.volume_integral); println()
+  @test_nowarn println(solver.volume_integral)
+  @test_nowarn display(solver.volume_integral)
+
   @test_nowarn show(semi); println()
   @test_nowarn println(semi)
   @test_nowarn display(semi)