start example/test for components access

examples/components/components_test.go

@@ -0,0 +1,15 @@
+package components
+
+import (
+	"testing"
+	"testing/quick"
+)
+
+//go:generate go run asm.go -out components.s -stubs stub.go
+
+func TestAdd(t *testing.T) {
+	expect := func(x uint64, s Struct, y uint64) uint64 { return x + y }
+	if err := quick.CheckEqual(Add, expect, nil); err != nil {
+		t.Fatal(err)
+	}
+}