add initial (dummy) tests

.luacheckrc

@@ -1,6 +1,9 @@
 globals = {
 	"blockexchange",
-	"worldedit"
+	"worldedit",
+	["minetest"] = {
+		["request_http_api"] = true
+	}
 }
 
 read_globals = {
@@ -15,5 +18,8 @@ read_globals = {
 	"VoxelArea",
 
 	-- opt deps
-	"areas", "monitoring"
+	"areas", "monitoring",
+
+	-- testing
+	"mineunit", "sourcefile", "assert"
 }

spec/sort_pos_spec.lua

@@ -0,0 +1,22 @@
+require("mineunit")
+
+mineunit("core")
+mineunit("player")
+mineunit("default/functions")
+
+minetest.request_http_api = function()
+	return {}
+end
+
+sourcefile("init")
+
+describe("blockexchange.sort_pos", function()
+	it("returns proper coordinates", function()
+		local pos1 = {x=1, y=2, z=3}
+		local pos2 = {x=0, y=0, z=0}
+		pos1, pos2 = blockexchange.sort_pos(pos1, pos2)
+		assert.not_nil(pos1)
+		assert.not_nil(pos2)
+		assert.equals(0, pos1.x)
+	end)
+end)