Index: tests/conf/tests/Makefile
===================================================================
--- tests/conf/tests/Makefile	(revision 2269)
+++ tests/conf/tests/Makefile	(revision 2270)
@@ -1,6 +1,7 @@
 TESTS =  \
 	list_merge.diff \
 	list_set.diff \
+	arr_merge.diff \
 	arr_set.diff \
 	scalar.diff
 
Index: tests/conf/tests/arr_merge.ref
===================================================================
--- tests/conf/tests/arr_merge.ref	(nonexistent)
+++ tests/conf/tests/arr_merge.ref	(revision 2270)
@@ -0,0 +1,31 @@
+=== initial state: empty ===
+ I design/default_layer_name[] = <empty>
+=== import 3 levels ===
+Result: 0
+ I design/default_layer_name[0] = sys1 <<prio=200 from=embedded:3>> conf_rev=1
+ I design/default_layer_name[1] = sys2 <<prio=200 from=embedded:4>> conf_rev=1
+Result: 0
+ I design/default_layer_name[0] = user1 <<prio=400 from=embedded:3>> conf_rev=2
+ I design/default_layer_name[1] = user2 <<prio=400 from=embedded:4>> conf_rev=2
+Result: 0
+ I design/default_layer_name[0] = design1 <<prio=700 from=embedded:3>> conf_rev=3
+ I design/default_layer_name[1] = design2 <<prio=700 from=embedded:4>> conf_rev=3
+=== change policy: design->prepend (design, user) ===
+ I design/default_layer_name[0] = design1 <<prio=700 from=embedded:3>> conf_rev=4
+ I design/default_layer_name[1] = design2 <<prio=700 from=embedded:4>> conf_rev=4
+ I design/default_layer_name[2] = user1 <<prio=400 from=embedded:3>> conf_rev=4
+ I design/default_layer_name[3] = user2 <<prio=400 from=embedded:4>> conf_rev=4
+=== change policy: user->append (design, sys, user) ===
+ I design/default_layer_name[0] = design1 <<prio=700 from=embedded:3>> conf_rev=5
+ I design/default_layer_name[1] = design2 <<prio=700 from=embedded:4>> conf_rev=5
+ I design/default_layer_name[2] = sys1 <<prio=200 from=embedded:3>> conf_rev=5
+ I design/default_layer_name[3] = sys2 <<prio=200 from=embedded:4>> conf_rev=5
+ I design/default_layer_name[4] = user1 <<prio=400 from=embedded:3>> conf_rev=5
+ I design/default_layer_name[5] = user2 <<prio=400 from=embedded:4>> conf_rev=5
+=== change policy: design->append (sys, user, design) ===
+ I design/default_layer_name[0] = sys1 <<prio=200 from=embedded:3>> conf_rev=6
+ I design/default_layer_name[1] = sys2 <<prio=200 from=embedded:4>> conf_rev=6
+ I design/default_layer_name[2] = user1 <<prio=400 from=embedded:3>> conf_rev=6
+ I design/default_layer_name[3] = user2 <<prio=400 from=embedded:4>> conf_rev=6
+ I design/default_layer_name[4] = design1 <<prio=700 from=embedded:3>> conf_rev=6
+ I design/default_layer_name[5] = design2 <<prio=700 from=embedded:4>> conf_rev=6
Index: tests/conf/tests/arr_merge.test
===================================================================
--- tests/conf/tests/arr_merge.test	(nonexistent)
+++ tests/conf/tests/arr_merge.test	(revision 2270)
@@ -0,0 +1,49 @@
+echo === initial state: empty ===
+reset *
+dump native design/default_layer_name
+
+echo === import 3 levels ===
+paste system \
+	li:pcb-rnd-conf-v1 { \
+		ha:overwrite { \
+			ha:design { \
+				li:default_layer_name = { sys1; sys2 } \
+			} \
+		} \
+	}
+dump native design/default_layer_name
+
+paste user \
+	li:pcb-rnd-conf-v1 { \
+		ha:overwrite { \
+			ha:design { \
+				li:default_layer_name = { user1; user2 } \
+			} \
+		} \
+	}
+dump native design/default_layer_name
+
+paste design \
+	li:pcb-rnd-conf-v1 { \
+		ha:overwrite { \
+			ha:design { \
+				li:default_layer_name = { design1; design2 } \
+			} \
+		} \
+	}
+dump native design/default_layer_name
+
+echo === change policy: design->prepend (design, user) ===
+role design
+chpolicy prepend
+dump native design/default_layer_name
+
+echo === change policy: user->append (design, sys, user) ===
+role user
+chpolicy append
+dump native design/default_layer_name
+
+echo === change policy: design->append (sys, user, design) ===
+role design
+chpolicy append
+dump native design/default_layer_name