--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/SbpOperators/boundaryops/boundary_restriction_test.jl	Wed Mar 17 20:34:40 2021 +0100
@@ -0,0 +1,61 @@
+using Test
+
+using Sbplib.SbpOperators
+using Sbplib.Grids
+
+@testset "boundary_restriction" begin
+    op = read_D2_operator(sbp_operators_path()*"standard_diagonal.toml"; order=4)
+    g_1D = EquidistantGrid(11, 0.0, 1.0)
+    g_2D = EquidistantGrid((11,15), (0.0, 0.0), (1.0,1.0))
+
+    @testset "boundary_restriction" begin
+        @testset "1D" begin
+            e_l = boundary_restriction(g_1D,op.eClosure,Lower())
+            @test e_l == boundary_restriction(g_1D,op.eClosure,CartesianBoundary{1,Lower}())
+            @test e_l == BoundaryOperator(g_1D,op.eClosure,Lower())
+            @test e_l isa BoundaryOperator{T,Lower} where T
+            @test e_l isa TensorMapping{T,0,1} where T
+
+            e_r = boundary_restriction(g_1D,op.eClosure,Upper())
+            @test e_r == boundary_restriction(g_1D,op.eClosure,CartesianBoundary{1,Upper}())
+            @test e_r == BoundaryOperator(g_1D,op.eClosure,Upper())
+            @test e_r isa BoundaryOperator{T,Upper} where T
+            @test e_r isa TensorMapping{T,0,1} where T
+        end
+
+        @testset "2D" begin
+            e_w = boundary_restriction(g_2D,op.eClosure,CartesianBoundary{1,Upper}())
+            @test e_w isa InflatedTensorMapping
+            @test e_w isa TensorMapping{T,1,2} where T
+        end
+    end
+
+    @testset "Application" begin
+        @testset "1D" begin
+            e_l = boundary_restriction(g_1D, op.eClosure, CartesianBoundary{1,Lower}())
+            e_r = boundary_restriction(g_1D, op.eClosure, CartesianBoundary{1,Upper}())
+
+            v = evalOn(g_1D,x->1+x^2)
+            u = fill(3.124)
+
+            @test (e_l*v)[] == v[1]
+            @test (e_r*v)[] == v[end]
+            @test (e_r*v)[1] == v[end]
+        end
+
+        @testset "2D" begin
+            e_w = boundary_restriction(g_2D, op.eClosure, CartesianBoundary{1,Lower}())
+            e_e = boundary_restriction(g_2D, op.eClosure, CartesianBoundary{1,Upper}())
+            e_s = boundary_restriction(g_2D, op.eClosure, CartesianBoundary{2,Lower}())
+            e_n = boundary_restriction(g_2D, op.eClosure, CartesianBoundary{2,Upper}())
+
+            v = rand(11, 15)
+            u = fill(3.124)
+
+            @test e_w*v == v[1,:]
+            @test e_e*v == v[end,:]
+            @test e_s*v == v[:,1]
+            @test e_n*v == v[:,end]
+       end
+    end
+end