1 files changed, 46 insertions, 0 deletions
diff --git a/lib/hipe/test/maps_SUITE_data/maps_has_map_fields.erl b/lib/hipe/test/maps_SUITE_data/maps_has_map_fields.erl
new file mode 100644
index 0000000000..61653aa519
--- /dev/null
+++ b/lib/hipe/test/maps_SUITE_data/maps_has_map_fields.erl
@@ -0,0 +1,46 @@
+%% -*- erlang-indent-level: 2 -*-
+%%-------------------------------------------------------------------------
+-module(maps_has_map_fields).
+
+-export([test/0]).
+
+test() ->
+  false = has_a_field(#{}),
+  false = has_a_field(#{b => 2}),
+  true  = has_a_field(#{a => 3}),
+  true  = has_a_field(#{b => c, a => false}),
+  
+  false = has_a_b_field(#{a => true}),
+  false = has_a_b_field(#{b => a}),
+  true  = has_a_b_field(#{a => 1, b => 2}),
+  true  = has_a_b_field(#{b => 3, a => 4}),
+
+  false = has_binary_field(#{}),
+  false = has_binary_field(#{#{} => yay}),
+  true  = has_binary_field(#{<<"true">> => false}),
+  
+  false = has_binary_but_no_map_field(#{}),
+  false = has_map_but_no_binary_field(#{}),
+  false = has_binary_but_no_map_field(#{#{} => 1}),
+  false = has_map_but_no_binary_field(#{<<"true">> => true}),
+  true  = has_binary_but_no_map_field(#{<<"true">> => false}),
+  true  = has_map_but_no_binary_field(#{#{} => 1}),
+  false = has_binary_but_no_map_field(#{<<"true">> => true, #{} => 1}),
+  false = has_map_but_no_binary_field(#{<<"true">> => true, #{} => 1}),
+  ok.
+
+has_a_field(#{a := _}) -> true;
+has_a_field(#{}) -> false.
+
+has_a_b_field(#{a := _, b := _}) -> true;
+has_a_b_field(#{}) -> false.
+
+has_binary_field(#{<<"true">> := _}) -> true;
+has_binary_field(#{}) -> false.
+
+has_map_but_no_binary_field(#{<<"true">> := _}) -> false;
+has_map_but_no_binary_field(#{} = M) -> maps:is_key(#{}, M).
+
+has_binary_but_no_map_field(#{<<"true">> := _} = M) ->
+    not maps:is_key(#{}, M);
+has_binary_but_no_map_field(#{}) -> false.