--- a/test/SbpOperators/volumeops/derivatives/first_derivative_test.jl	Wed Mar 23 12:39:35 2022 +0100
+++ b/test/SbpOperators/volumeops/derivatives/first_derivative_test.jl	Wed Mar 23 12:43:03 2022 +0100
@@ -27,15 +27,17 @@
         g₁ = EquidistantGrid(11, 0., 1.)
         g₂ = EquidistantGrid((11,14), (0.,1.), (1.,3.))
         
-        @test first_derivative(g₁, stencil_set, 1) isa TensorMapping{Float64,1,1}
-        @test first_derivative(g₂, stencil_set, 2) isa TensorMapping{Float64,2,2}
+        @test first_derivative(g₁, stencil_set, 1) isa LazyTensor{Float64,1,1}
+        @test first_derivative(g₂, stencil_set, 2) isa LazyTensor{Float64,2,2}
+        @test first_derivative(g₁, stencil_set, 1) == first_derivative(g₁, stencil_set)
 
         interior_stencil = CenteredStencil(-1,0,1)
         closure_stencils = [Stencil(-1,1, center=1)]
 
-        @test first_derivative(g₁, interior_stencil, closure_stencils, 1) isa TensorMapping{Float64,1,1}
+        @test first_derivative(g₁, interior_stencil, closure_stencils, 1) isa LazyTensor{Float64,1,1}
         @test first_derivative(g₁, interior_stencil, closure_stencils, 1) isa VolumeOperator
-        @test first_derivative(g₂, interior_stencil, closure_stencils, 2) isa TensorMapping{Float64,2,2}
+        @test first_derivative(g₁, interior_stencil, closure_stencils, 1) == first_derivative(g₁, interior_stencil, closure_stencils)
+        @test first_derivative(g₂, interior_stencil, closure_stencils, 2) isa LazyTensor{Float64,2,2}
     end
 
     @testset "Accuracy conditions" begin