diff --git a/test/runtests.jl b/test/runtests.jl
index ae71cc0..58fe066 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -3,3 +3,4 @@ using Test
 
 include("load_data.jl")
 include("get_getters.jl")
+include("transform.jl")
diff --git a/test/transform.jl b/test/transform.jl
new file mode 100644
index 0000000..c0b87aa
--- /dev/null
+++ b/test/transform.jl
@@ -0,0 +1,5 @@
+@testset "Test transformation" begin
+  fn = String("data/Mx_1x1.txt")
+  df = read_HMD(fn)
+  @test !isempty(transform(fn, :Male))
+end