add test

Author: N5N3

test/issues/runtests.jl

@@ -156,7 +156,7 @@ using Interpolations, Test, ForwardDiff
     end
     @testset "issue 469" begin
         # We have different inference result on different version.
-        max_dim = VERSION < v"1.3" ? 3 : isdefined(Base, :Any32) ? 7 : 5
+        max_dim = isdefined(Base, :Any32) ? 7 : 5
         for dims in 3:max_dim
             A = zeros(Float64, ntuple(_ -> 5, dims))
             itp = interpolate(A, BSpline(Quadratic(Reflect(OnCell()))))

test/nointerp.jl

@@ -14,3 +14,15 @@
     # @test ae[0,1] === NaN
     # @test_throws InexactError ae(1.5,2)
 end
+
+@testset "Stability of mixtrue with NoInterp and Interp" begin
+    A = zeros(Float64, 5, 5, 5, 5, 5, 5, 5)
+    st = BSpline(Quadratic(Reflect(OnCell()))), NoInterp(),
+         BSpline(Linear()), NoInterp(),
+         BSpline(Quadratic()), NoInterp(),
+         BSpline(Quadratic(Reflect(OnCell())))
+    itp = interpolate(A, st)
+    @test (@inferred Interpolations.hessian(itp, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0)) == zeros(4,4)
+    @test (@inferred Interpolations.gradient(itp, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0)) == zeros(4)
+    @test (@inferred itp(1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0)) == 0
+end