Add basic world object and tests

pkg/rovegame/world.go

@@ -0,0 +1,32 @@
+package rovegame
+
+// World describes a self contained universe and everything in it
+type World struct {
+	instances []Instance
+}
+
+// Instance describes a single entity or instance of an entity in the world
+type Instance struct {
+	id int
+}
+
+// NewWorld creates a new world object
+func NewWorld() *World {
+	return &World{}
+}
+
+// Adds an instance to the game
+func (w *World) CreateInstance() int {
+	// Simple ID to start with
+	id := len(w.instances)
+
+	// Initialise the instance
+	instance := Instance{
+		id: id,
+	}
+
+	// Append the instance to the list
+	w.instances = append(w.instances, instance)
+
+	return id
+}

pkg/rovegame/world_test.go

@@ -0,0 +1,24 @@
+package rovegame
+
+import (
+	"testing"
+)
+
+func TestNewWorld(t *testing.T) {
+	// Very basic for now, nothing to verify
+	world := NewWorld()
+	if world == nil {
+		t.Error("Failed to create world")
+	}
+}
+
+func TestWorld_CreateInstance(t *testing.T) {
+	world := NewWorld()
+	a := world.CreateInstance()
+	b := world.CreateInstance()
+
+	// Basic duplicate check
+	if a == b {
+		t.Errorf("Created identical instances")
+	}
+}