Add insertunit tests for HomSpace

Author: lkdvos

test/spaces.jl

@@ -419,5 +419,12 @@ println("------------------------------------")
         @test W == @constinferred permute(W, ((1, 2), (3, 4, 5)))
         @test permute(W, ((2, 4, 5), (3, 1))) == (V2 ⊗ V4' ⊗ V5' ← V3 ⊗ V1')
         @test (V1 ⊗ V2 ← V1 ⊗ V2) == @constinferred TensorKit.compose(W, W')
+        @test @constinferred(insertunit(W)) == (V1 ⊗ V2 ← V3 ⊗ V4 ⊗ V5 ⊗ oneunit(V5))
+        @test @constinferred(insertunit(W; conj=true)) == (V1 ⊗ V2 ←
+                                                           V3 ⊗ V4 ⊗ V5 ⊗ oneunit(V5)')
+        @test @constinferred(insertunit(W, 1)) == (oneunit(V1) ⊗ V1 ⊗ V2 ← V3 ⊗ V4 ⊗ V5)
+        @test @constinferred(insertunit(W, 3)) == (V1 ⊗ V2 ⊗ oneunit(V1) ← V3 ⊗ V4 ⊗ V5)
+        @test @constinferred(insertunit(W, 3; preferdomain=true)) ==
+              (V1 ⊗ V2 ← oneunit(V1) ⊗ V3 ⊗ V4 ⊗ V5)
     end
 end