Add small world test

Makefile

@@ -24,5 +24,5 @@ format:
 
 .PHONY: spec
 spec: format
-	./crystal spec --warnings all --error-on-warnings
+	./crystal spec --no-debug --warnings all --error-on-warnings
 

spec/expansion_spec.cr

@@ -1,4 +1,4 @@
-require "spec"
+require "./spec_helper"
 require "./../src/map"
 require "./../src/queue"
 

spec/queue_spec.cr

@@ -1,4 +1,4 @@
-require "spec"
+require "./spec_helper"
 require "./../src/queue"
 require "./../src/command"
 

spec/world_spec.cr

@@ -0,0 +1,13 @@
+require "./spec_helper"
+require "../src/world"
+
+describe "World" do
+  it "should build crystal harvester" do
+    world = World.new
+    point = Point.new(2, 3)
+    cmd = BuildCrystalHarvesterCommand.new(point)
+    world.push(cmd)
+    world.run(100)
+    world.map.get(point).has_role(TileRole::CrystalHarvester)
+  end
+end

src/world.cr

@@ -1,3 +1,5 @@
+require "./resources"
+
 class World
   property ts : Int32
 
@@ -15,7 +17,6 @@ class World
   def push(command : Command)
     dur = command.start(self)
     done_at = @ts + dur
-    printf "world : %d : plan `%s` at %d\n", @ts, typeof(command), done_at
     @tasks.push(done_at, command)
   end
 
@@ -28,7 +29,6 @@ class World
       command = item.command
       @ts = item.ts
       command.finish(self)
-      printf "world : %d : finish `%s`\n", @ts, typeof(command)
     end
   end
 end