Serialise the World as well

pkg/game/world_test.go

@@ -1,26 +1,27 @@
 package game
 
 import (
+	"os"
 	"testing"
 )
 
 func TestNewWorld(t *testing.T) {
 	// Very basic for now, nothing to verify
-	world := NewWorld()
+	world := NewWorld(os.TempDir())
 	if world == nil {
 		t.Error("Failed to create world")
 	}
 }
 
 func TestWorld_CreateInstance(t *testing.T) {
-	world := NewWorld()
+	world := NewWorld(os.TempDir())
 	a := world.CreateInstance()
 	b := world.CreateInstance()
 
 	// Basic duplicate check
 	if a == b {
 		t.Errorf("Created identical instances")
-	} else if len(world.instances) != 2 {
+	} else if len(world.Instances) != 2 {
 		t.Errorf("Incorrect number of instances created")
 	}
 }