--- a/src/oct-map.cc
+++ b/src/oct-map.cc
@@ -70,6 +70,13 @@
   return retval;
 }
 
+/*
+%!# test preservation of keys by squeeze
+%!test
+%!  x(1,1,1,1).d = 10; x(3,5,1,7).a = "b"; x(2,4,1,7).f = 27;
+%!  assert (fieldnames (squeeze (x)), {"d"; "a"; "f"});
+*/
+
 Octave_map
 Octave_map::permute (const Array<int>& vec, bool inv) const
 {
@@ -91,6 +98,13 @@
   return retval;
 }
 
+/*
+%!# test preservation of key order by permute
+%!test
+%!  x(1,1,1,1).d = 10; x(3,5,1,7).a = "b"; x(2,4,1,7).f = 27;
+%!  assert (fieldnames (permute (x, [3, 4, 1, 2])), {"d"; "a"; "f"});
+*/
+
 Cell&
 Octave_map::contents (const std::string& k)
 {
@@ -165,6 +179,15 @@
   return retval;
 }
 
+/*
+%!# test preservation of key order by transpose
+%!test
+%!  x(1,1).d = 10; x(3,5).a = "b"; x(2,4).f = 27;
+%!  assert (fieldnames (transpose (x)), {"d"; "a"; "f"});
+%!  assert (fieldnames (x'), {"d"; "a"; "f"});
+%!  assert (fieldnames (x.'), {"d"; "a"; "f"});
+*/
+
 Octave_map
 Octave_map::reshape (const dim_vector& new_dims) const
 {
@@ -186,6 +209,13 @@
   return retval;
 }
 
+/*
+%!# test preservation of key order by reshape
+%!test
+%!  x(1,1).d = 10; x(4,6).a = "b"; x(2,4).f = 27;
+%!  assert (fieldnames (reshape (x, 3, 8)), {"d"; "a"; "f"});
+*/
+
 void
 Octave_map::resize (const dim_vector& dv, bool fill)
 {
@@ -256,6 +286,14 @@
   return retval;
 }
 
+/*
+%!# test preservation of key order by concatenation
+%!test
+%!  x(1, 1).d = 10; x(4, 6).a = "b"; x(2, 4).f = 27;
+%!  y(1, 6).f = 11; y(1, 6).a = "c"; y(1, 6).d = 33;
+%!  assert (fieldnames ([x; y]), {"d"; "a"; "f"});
+*/
+
 static bool
 keys_ok (const Octave_map& a, const Octave_map& b, string_vector& keys)
 {
@@ -490,6 +528,13 @@
 }
 
 /*
+%!# test preservation of key order by indexing
+%!test
+%!  x(1, 1).d = 10; x(4, 6).a = "b"; x(2, 4).f = 27;
+%!  assert (fieldnames (x([1, 2], [2:5])), {"d"; "a"; "f"});
+*/
+
+/*
 ;;; Local Variables: ***
 ;;; mode: C++ ***
 ;;; End: ***