Add test case to generate branch ends and verify that runes and orb exist.

2 files changed, 13 insertions, 2 deletions

diff --git a/crawl-ref/source/dat/clua/iter.lua b/crawl-ref/source/dat/clua/iter.lua
index e4d1409781..8adf548a15 100644
--- a/crawl-ref/source/dat/clua/iter.lua
+++ b/crawl-ref/source/dat/clua/iter.lua
@@ -338,7 +338,7 @@ function iter.stack_search (coord, term, extra)
 
   local stack = dgn.items_at(_x, _y)
   if #stack == 0 then
-    error("no stack at " .. _x .. "/" .. _y)
+    return nil
   end
 
   for _, item in ipairs(stack) do
@@ -347,7 +347,7 @@ function iter.stack_search (coord, term, extra)
     end
   end
 
-  return false
+  return nil
 end
 
 function iter.stack_destroy(coord, extra)
diff --git a/crawl-ref/source/dat/clua/test.lua b/crawl-ref/source/dat/clua/test.lua
index 404b2e1d1f..22a4005d20 100644
--- a/crawl-ref/source/dat/clua/test.lua
+++ b/crawl-ref/source/dat/clua/test.lua
@@ -20,4 +20,15 @@ function test.regenerate_level(place)
   debug.flush_map_memory()
   dgn.reset_level()
   debug.generate_level()
+end
+
+function test.level_contains_item(item)
+  for y = 1, dgn.GYM - 2 do
+    for x = 1, dgn.GXM - 2 do
+      if iter.stack_search(x, y, item) then
+        return true
+      end
+    end
+  end
+  return false
 end
\ No newline at end of file