--- a/CMakeLists.txt	Mon Jan 20 22:42:36 2014 +0100
+++ b/CMakeLists.txt	Tue Jan 21 01:23:57 2014 +0100
@@ -220,5 +220,6 @@
 
 # set set this to "" if you want to see what's going on
 set(STATSONLYFLAG "--stats-only")
+add_test("LuaAPI:GetGravity/SetGravity" "bin/hwengine" "--prefix" "${TESTSDATADIR}" "--nosound" "--nomusic" ${STATSONLYFLAG} "--lua-test" "${LUAAPITESTS}/gravity_get_set.lua")
 add_test("DrillRockets_drill" "bin/hwengine" "--prefix" "${TESTSDATADIR}" "--nosound" "--nomusic" ${STATSONLYFLAG} "--lua-test" "${LUATESTS}/drillrockets_drill.lua")
 add_test("DrillRockets_boom" "bin/hwengine" "--prefix" "${TESTSDATADIR}" "--nosound" "--nomusic" ${STATSONLYFLAG} "--lua-test" "${LUATESTS}/drillrockets_boom.lua")

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/lua/luaAPI/gravity_get_set.lua	Tue Jan 21 01:23:57 2014 +0100
@@ -0,0 +1,107 @@
+
+
+-- * let grenade fall
+-- * after a second capture fall distance
+-- * change gravity value every second and see if the fall distance in the
+--   following second is about what we'd expect it to be
+
+local spawnX = 10
+local spawnY = -500
+
+local defaultG = nil
+local currentG = nil
+
+local defaultDY = nil
+local expectedY = nil
+
+local testGs = nil
+
+local nFails = 0
+
+function onGameInit()
+
+
+	-- The base number for the random number generator
+	Seed = 1
+	-- The map to be played
+	Map = "Ruler"
+	-- The theme to be used
+	Theme = "Bamboo"
+	-- Game settings and rules
+	EnableGameFlags(gfOneClanMode, gfInvulnerable)
+	CaseFreq = 0
+	MinesNum = 0
+	Explosives = 0
+
+	-- Create the player team
+	AddTeam("O_o", 14483456, "Simple", "Island", "Default")
+	-- And add a hog to it
+	player = AddHog("o_O", 0, 1, "NoHat")
+	SetGearPosition(player, 100, 100)
+end
+
+local tol = 0
+
+function IsKindaSame(a, b)
+	tol = 1 + math.max(1,math.abs(currentG) / 100)
+	return (a >= b-tol) and (a <= b+tol)
+end
+
+function SpawnGrenade()
+	AddGear(spawnX, spawnY, gtGrenade, 0, 0, 0, 1000)
+end
+
+local gIdx = 1
+
+function onGearDelete(gear)
+	if GetGearType(gear) ~= gtGrenade then
+		return
+	end
+
+	-- catch initial measuring drop
+	if defaultDY == nil then
+		defaultDY = GetY(gear) - spawnY
+	elseif not IsKindaSame(GetY(gear), expectedY) then
+		nFails = nFails + 1
+		WriteLnToConsole("FAIL: Unexpected Y position! " .. GetY(gear) .. " returned, expected " .. expectedY .. ' (max tolerated difference = ' .. tol .. ')')
+	else
+		WriteLnToConsole("Y position OK! " .. GetY(gear) .. " returned, expected " .. expectedY .. ' (max tolerated difference = ' .. tol .. ')')
+	end
+
+	returnedG = GetGravity()
+	if (returnedG ~= currentG) then
+		WriteLnToConsole("GetGravity did not return the value that we used with SetGravity! " .. returnedG .. " returned, expected " .. currentG)
+		nFails = nFails + 1
+	end
+
+	currentG = testGs[gIdx]
+	gIdx = gIdx + 1
+	-- after last test
+	if currentG == nil then
+		if (nFails > 0) then
+			EndLuaTest(TEST_FAILED)
+		else
+			EndLuaTest(TEST_SUCCESSFUL)
+		end
+	end
+
+	WriteLnToConsole("SetGravity(" .. currentG .. ") ...")
+	SetGravity(currentG)
+
+	SpawnGrenade()
+	expectedY = spawnY + math.floor(currentG * defaultDY / 100)
+end
+
+function onGameStart()
+	currentG = 100
+	defaultG = GetGravity()
+	if (defaultG ~= 100) then
+		WriteLnToConsole("GetGravity did not return 100 at game start")
+		nFails = 1
+	end
+
+	SpawnGrenade()
+
+	testGs = {150, 200, 300, 10, 1, 13, 15, 0, 27, -600, -10, nil}
+end
+