--- a/test/SbpOperators/boundaryops/normal_derivative_test.jl	Mon Feb 21 13:13:37 2022 +0100
+++ b/test/SbpOperators/boundaryops/normal_derivative_test.jl	Mon Feb 21 23:33:29 2022 +0100
@@ -2,7 +2,6 @@
 
 using Sbplib.SbpOperators
 using Sbplib.Grids
-using Sbplib.RegionIndices
 using Sbplib.LazyTensors
 
 import Sbplib.SbpOperators.BoundaryOperator
@@ -14,8 +13,7 @@
     	stencil_set = read_stencil_set(sbp_operators_path()*"standard_diagonal.toml"; order=4)
     	d_closure = parse_stencil(stencil_set["d1"]["closure"])
         @testset "1D" begin
-            d_l = normal_derivative(g_1D, d_closure, Lower())
-            @test d_l == normal_derivative(g_1D, d_closure, CartesianBoundary{1,Lower}())
+            d_l = normal_derivative(g_1D, d_closure, CartesianBoundary{1,Lower}())
             @test d_l isa BoundaryOperator{T,Lower} where T
             @test d_l isa TensorMapping{T,0,1} where T
         end
@@ -24,8 +22,8 @@
             d_n = normal_derivative(g_2D, d_closure, CartesianBoundary{2,Upper}())
             Ix = IdentityMapping{Float64}((size(g_2D)[1],))
             Iy = IdentityMapping{Float64}((size(g_2D)[2],))
-            d_l = normal_derivative(restrict(g_2D,1),d_closure,Lower())
-            d_r = normal_derivative(restrict(g_2D,2),d_closure,Upper())
+            d_l = normal_derivative(restrict(g_2D,1),d_closure,CartesianBoundary{1,Lower}())
+            d_r = normal_derivative(restrict(g_2D,2),d_closure,CartesianBoundary{1,Upper}())
             @test d_w ==  d_l⊗Iy
             @test d_n ==  Ix⊗d_r
             @test d_w isa TensorMapping{T,1,2} where T
@@ -40,10 +38,8 @@
         @testset "2nd order" begin
         	stencil_set = read_stencil_set(sbp_operators_path()*"standard_diagonal.toml"; order=2)
         	d_closure = parse_stencil(stencil_set["d1"]["closure"])
-            d_w = normal_derivative(g_2D, d_closure, CartesianBoundary{1,Lower}())
-            d_e = normal_derivative(g_2D, d_closure, CartesianBoundary{1,Upper}())
-            d_s = normal_derivative(g_2D, d_closure, CartesianBoundary{2,Lower}())
-            d_n = normal_derivative(g_2D, d_closure, CartesianBoundary{2,Upper}())
+            (d_w, d_e, d_s, d_n) = 
+                map(id -> normal_derivative(g_2D, d_closure, id), boundary_identifiers(g_2D))
 
             @test d_w*v ≈ v∂x[1,:] atol = 1e-13
             @test d_e*v ≈ -v∂x[end,:] atol = 1e-13
@@ -52,12 +48,10 @@
         end
 
         @testset "4th order" begin
-            stencil_set = read_stencil_set(sbp_operators_path()*"standard_diagonal.toml"; order=2)
+            stencil_set = read_stencil_set(sbp_operators_path()*"standard_diagonal.toml"; order=4)
         	d_closure = parse_stencil(stencil_set["d1"]["closure"])
-            d_w = normal_derivative(g_2D, d_closure, CartesianBoundary{1,Lower}())
-            d_e = normal_derivative(g_2D, d_closure, CartesianBoundary{1,Upper}())
-            d_s = normal_derivative(g_2D, d_closure, CartesianBoundary{2,Lower}())
-            d_n = normal_derivative(g_2D, d_closure, CartesianBoundary{2,Upper}())
+            (d_w, d_e, d_s, d_n) = 
+                map(id -> normal_derivative(g_2D, d_closure, id), boundary_identifiers(g_2D))
 
             @test d_w*v ≈ v∂x[1,:] atol = 1e-13
             @test d_e*v ≈ -v∂x[end,:] atol = 1e-13