diff --git a/Project.toml b/Project.toml
index 9d18dc3..02b9d2b 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "TensorAlgebra"
 uuid = "68bd88dc-f39d-4e12-b2ca-f046b68fcc6a"
 authors = ["ITensor developers <support@itensor.org> and contributors"]
-version = "0.1.8"
+version = "0.1.9"
 
 [deps]
 ArrayLayouts = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"
diff --git a/test/Project.toml b/test/Project.toml
index 09a07c1..68a7cc1 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -10,6 +10,7 @@ Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
 StableRNGs = "860ef19b-820b-49d6-a774-d7a799459cd3"
 Suppressor = "fd094767-a336-5f1f-9728-57cf17d0bbfb"
+SymmetrySectors = "f8a8ad64-adbc-4fce-92f7-ffe2bb36a86e"
 TensorAlgebra = "68bd88dc-f39d-4e12-b2ca-f046b68fcc6a"
 TensorOperations = "6aa20fa7-93e2-5fca-9bc0-fbd0db3c71a2"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
@@ -19,5 +20,6 @@ TestExtras = "5ed8adda-3752-4e41-b88a-e8b09835ee3a"
 Aqua = "0.8.9"
 SafeTestsets = "0.1"
 Suppressor = "0.2"
+SymmetrySectors = "0.1"
 TensorOperations = "5.1.3"
 Test = "1.10"
diff --git a/test/test_gradedunitrangesext_basics.jl b/test/test_gradedunitrangesext_basics.jl
index 881c151..16a83a3 100644
--- a/test/test_gradedunitrangesext_basics.jl
+++ b/test/test_gradedunitrangesext_basics.jl
@@ -1,18 +1,9 @@
 using BlockArrays: Block
 using TensorAlgebra: ⊗
-using GradedUnitRanges: GradedUnitRanges, gradedrange, label
+using GradedUnitRanges: GradedUnitRanges, gradedrange, dual, isdual, label
+using SymmetrySectors: U1
 using Test: @test, @testset
 
-struct U1
-  dim::Int
-end
-Base.isless(l1::U1, l2::U1) = isless(l1.dim, l2.dim)
-GradedUnitRanges.fuse_labels(l1::U1, l2::U1) = U1(l1.dim + l2.dim)
-
-## TODO: This should need to get implemented, but `dual`
-## isn't being used right now in `GradedUnitRanges`.
-## GradedUnitRanges.dual(l::U1) = U1(-l.dim)
-
 @testset "TensorAlgebraGradedUnitRangesExt" begin
   a1 = gradedrange([U1(0) => 2, U1(1) => 3])
   a2 = gradedrange([U1(2) => 3, U1(3) => 4])
@@ -25,4 +16,16 @@ GradedUnitRanges.fuse_labels(l1::U1, l2::U1) = U1(l1.dim + l2.dim)
   @test a[Block(2)] == 7:15
   @test a[Block(3)] == 16:23
   @test a[Block(4)] == 24:35
+  @test !isdual(a)
+
+  a = a1 ⊗ dual(a2)
+  @test label(a[Block(1)]) == U1(-2)
+  @test label(a[Block(2)]) == U1(-1)
+  @test label(a[Block(3)]) == U1(-3)
+  @test label(a[Block(4)]) == U1(-2)
+  @test a[Block(1)] == 1:6
+  @test a[Block(2)] == 7:15
+  @test a[Block(3)] == 16:23
+  @test a[Block(4)] == 24:35
+  @test !isdual(a)
 end