increase coverage

Author: TSGut

test/test_disk.jl

@@ -105,6 +105,10 @@ import ForwardDiff: hessian
         # data size tests
         @test size((X.data).data) == (3, ℵ₀)
         @test size((Y.data).data) == (5, ℵ₀)
+            
+        # for now, reject non-zero first parameter options
+        @test_throws ErrorException("Implement for non-zero first basis parameter.") jacobimatrix(Val(1),Zernike(1,1))  
+        @test_throws ErrorException("Implement for non-zero first basis parameter.") jacobimatrix(Val(2),Zernike(1,1))
     end
 
     @testset "Transform" begin