test that broadcast retains parent axes for multidim VoA

Author: jlchan

test/basic_indexing.jl

@@ -252,8 +252,9 @@ foo!(u_vector)
 @test all(vec(u_matrix) .≈ vec(u_vector))
 
 # test that, for VectorOfArray with multi-dimensional parent arrays,
-# `similar` preserves the structure of the parent array
+# broadcast and `similar` preserve the structure of the parent array
 @test typeof(parent(similar(u_matrix))) == typeof(parent(u_matrix))
+@test typeof(parent((x->x).(u_matrix))) == typeof(parent(u_matrix)) 
 
 # test efficiency 
 num_allocs = @allocations foo!(u_matrix)