Add the concept of commands to the world and executing them

pkg/game/command_test.go

@@ -0,0 +1,50 @@
+package game
+
+import (
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCommand_Spawn(t *testing.T) {
+	world := NewWorld()
+	a := uuid.New()
+
+	spawnCommand := world.CommandSpawn(a)
+	assert.NoError(t, world.Execute(spawnCommand), "Failed to execute spawn command")
+
+	instance, ok := world.Instances[a]
+	assert.True(t, ok, "No new instance in world")
+	assert.Equal(t, a, instance.id, "New instance has incorrect id")
+}
+
+func TestCommand_Move(t *testing.T) {
+	world := NewWorld()
+	a := uuid.New()
+	assert.NoError(t, world.Spawn(a), "Failed to spawn")
+
+	pos := Vector{
+		X: 1.0,
+		Y: 2.0,
+		Z: 3.0,
+	}
+
+	err := world.SetPosition(a, pos)
+	assert.NoError(t, err, "Failed to set position for instance")
+
+	move := Vector{
+		X: 3.0,
+		Y: 2.0,
+		Z: 1.0,
+	}
+
+	// Try the move command
+	moveCommand := world.CommandMove(a, move)
+	assert.NoError(t, world.Execute(moveCommand), "Failed to execute move command")
+
+	newpos, err := world.GetPosition(a)
+	assert.NoError(t, err, "Failed to set position for instance")
+	pos.Add(move)
+	assert.Equal(t, pos, newpos, "Failed to correctly set position for instance")
+}