add test

Author: lkdvos

test/tensors/diagonal.jl

@@ -119,11 +119,15 @@ diagspacelist = (
     if BraidingStyle(I) isa SymmetricBraiding
         @timedtestset "Permutations" begin
             t = DiagonalTensorMap(randn(ComplexF64, reduceddim(V)), V)
+            # preserving diagonal
             t1 = @constinferred permute(t, $(((2,), (1,))))
-            if BraidingStyle(sectortype(V)) isa Bosonic
-                @test t1 ≈ transpose(t)
-            end
+            @test t1 isa DiagonalTensorMap
             @test convert(TensorMap, t1) == permute(convert(TensorMap, t), (((2,), (1,))))
+            t1′ = @constinferred transpose(t)
+            @test t1′ isa DiagonalTensorMap
+            @test t1 ≈ t1′
+
+            # not preserving diagonal
             t2 = @constinferred permute(t, $(((1, 2), ())))
             @test convert(TensorMap, t2) == permute(convert(TensorMap, t), (((1, 2), ())))
             t3 = @constinferred permute(t, $(((2, 1), ())))