control seed during unit tests

mods/stm/util.lua

@@ -151,5 +151,3 @@ if minetest then
 else
   stm.base_path = './mods/stm/'
 end
-
-math.randomseed(os.time())

unittest/run.lua

@@ -47,6 +47,7 @@ for k,v in pairs(_G) do
                         dofile("unittest/mocks/" .. name)
                     end
                 end
+                math.randomseed(1337)
                if oldFunction then oldFunction() end
             end
         end)()

unittest/test_history.lua

@@ -5,7 +5,7 @@ function TestHistory:testPopulate()
 end
 
 function TestHistory:testSimulate()
-  local sim_time = 0.05 *24*60*60
+  local sim_time = 0.1 *24*60*60
   -- TODO: uncomment this line when physics stop being screwy
   -- MapData.get_node = MapData.get_node_mock_wavy