diff --git a/test/transforms/functional.jl b/test/transforms/functional.jl
index 69f46cae..1020be2e 100644
--- a/test/transforms/functional.jl
+++ b/test/transforms/functional.jl
@@ -19,19 +19,17 @@
   tₒ = revert(T, n, c)
   @test Tables.matrix(t) ≈ Tables.matrix(tₒ)
 
-  x = rand(Normal(0, 25), 100)
-  y = x + rand(Normal(10, 2), 100)
+  # identity
+  x = rand(100)
+  y = x + rand(100)
   t = Table(; x, y)
-  T = Functional(exp)
+
+  T = Functional(identity)
   n, c = apply(T, t)
-  @test all(>(0), n.x)
-  @test all(>(0), n.y)
+  @test t == n
   tₒ = revert(T, n, c)
-  @test Tables.matrix(t) ≈ Tables.matrix(tₒ)
+  @test tₒ == t
 
-  x = rand(Normal(0, 25), 100)
-  y = x + rand(Normal(10, 2), 100)
-  t = Table(; x, y)
   T = Functional(x -> x)
   n, c = apply(T, t)
   @test t == n