use SymmetrySectors U1 in tests

Author: ogauthe

NDTensors/src/lib/BlockSparseArrays/ext/BlockSparseArraysGradedAxesExt/test/runtests.jl

@@ -15,6 +15,7 @@ using NDTensors.GradedAxes:
   isdual
 using NDTensors.LabelledNumbers: label
 using NDTensors.SparseArrayInterface: nstored
+using NDTensors.SymmetrySectors: U1
 using NDTensors.TensorAlgebra: fusedims, splitdims
 using LinearAlgebra: adjoint
 using Random: randn!
@@ -26,13 +27,6 @@ function blockdiagonal!(f, a::AbstractArray)
   return a
 end
 
-struct U1
-  n::Int
-end
-GradedAxes.dual(c::U1) = U1(-c.n)
-GradedAxes.fuse_labels(c1::U1, c2::U1) = U1(c1.n + c2.n)
-Base.isless(c1::U1, c2::U1) = isless(c1.n, c2.n)
-
 const elts = (Float32, Float64, Complex{Float32}, Complex{Float64})
 @testset "BlockSparseArraysGradedAxesExt (eltype=$elt)" for elt in elts
   @testset "map" begin