diff --git a/test/integration/QrochetQuacExt_test.jl b/test/integration/QrochetQuacExt_test.jl
new file mode 100644
index 0000000..19e4aea
--- /dev/null
+++ b/test/integration/QrochetQuacExt_test.jl
@@ -0,0 +1,18 @@
+@testset "QrochetQuacExt" begin
+    using Quac
+
+    @testset "QFT_3qubits" begin
+        qft3circ = Quac.Algorithms.QFT(3)
+        qft3qrochet = Quantum(qft3circ)
+
+        # test sites (inputs and outputs) of the quantum circuit
+        for site in values(qft3qrochet.sites)
+            @test length(qft3qrochet.tn.indexmap[site]) == 1
+        end
+
+        # test inner tensors
+        for notsite in filter(idx -> idx ∉ values(qrqft3.sites), keys(qrqft3.tn.indexmap))
+            @test length(qft3qrochet.tn.indexmap[notsite]) > 1
+        end
+    end
+end
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