diff --git a/test/interpolate.jl b/test/interpolate.jl
index 9357174..5a6636d 100644
--- a/test/interpolate.jl
+++ b/test/interpolate.jl
@@ -5,7 +5,7 @@
     for pos in [tuple(0.01), tuple(0.321), tuple(0.5)]
         for periodicity in [true, false]
             @testset "pos is $(pos), peridoicity is $(periodicity)" begin
-                gi = GridInfo(tuple(100), tuple(10), tuple(periodicity), tuple(0), tuple(10.0))
+                gi = GridInfo(tuple(100), tuple(10), tuple(periodicity), tuple(10), tuple(10.0))
                 f_window = [x -> Wkb(x, (gi.w[i] + 0.5) * gi.h[i], 5.0 * gi.w[i]) for i in 1:1]
                 cheb_coefs = tuple([ChebCoef(f_window[i], gi.h[i], gi.w[i], 10) for i in 1:1]...)
 
@@ -18,7 +18,38 @@
                 interpolate_single_naive!(q, pos, gi, gb_naive, cheb_coefs)
             
                 @test gb_cheb.pad_grid ≈ gb_naive.pad_grid
+                @test gb_cheb.pad_grid ≈ gb_direct.pad_grid
                 @test gb_cheb.image_grid ≈ gb_naive.image_grid
+                @test gb_cheb.image_grid ≈ gb_direct.image_grid
+            end
+        end
+    end
+
+end
+
+@testset "interpolate 2d" begin
+
+    q = 0.8
+
+    for pos in [tuple(0.01, 0.01), tuple(0.321, 5.232), tuple(0.5, 2.0)]
+        for periodicity in [(true, true), (true, false), (false, true), (false, false)]
+            @testset "pos is $(pos), peridoicity is $(periodicity)" begin
+                gi = GridInfo(tuple(100, 110), tuple(10, 8), periodicity, (10, 10), tuple(9.0, 11.0))
+                f_window = [x -> Wkb(x, (gi.w[i] + 0.5) * gi.h[i], 5.0 * gi.w[i]) for i in 1:2]
+                cheb_coefs = tuple([ChebCoef(f_window[i], gi.h[i], gi.w[i], 10) for i in 1:2]...)
+
+                gb_cheb = GridBox(gi)
+                gb_direct = GridBox(gi)
+                gb_naive = GridBox(gi)
+
+                interpolate_single!(q, pos, gi, gb_cheb, cheb_coefs)
+                interpolate_single_direct!(q, pos, gi, gb_direct, cheb_coefs)
+                interpolate_single_naive!(q, pos, gi, gb_naive, cheb_coefs)
+            
+                @test gb_cheb.pad_grid ≈ gb_naive.pad_grid
+                @test gb_cheb.pad_grid ≈ gb_direct.pad_grid
+                @test gb_cheb.image_grid ≈ gb_naive.image_grid
+                @test gb_cheb.image_grid ≈ gb_direct.image_grid
             end
         end
     end