test(cardinal): test to maintain interface component. (#381)

cardinal/ecs/component/metadata/component_metadata_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"gotest.tools/v3/assert"
+
 	"pkg.world.dev/world-engine/cardinal/ecs/entity"
 	"pkg.world.dev/world-engine/cardinal/ecs/filter"
 
@@ -27,6 +28,16 @@ type ComponentDataB struct {
 
 func (ComponentDataB) Name() string { return "b" }
 
+func getNameOfComponent(c metadata.Component) string {
+	return c.Name()
+}
+
+func TestComponentInterfaceSignature(t *testing.T) {
+	// The purpose of this test is to maintain api compatibility.
+	// It is to prevent the interface signature of metadata.Component from changing.
+	assert.Equal(t, getNameOfComponent(&ComponentDataA{}), "a")
+}
+
 func TestComponents(t *testing.T) {
 	world := ecs.NewTestWorld(t)
 	ecs.MustRegisterComponent[ComponentDataA](world)