Add test code

encode_opcode_test.go

@@ -0,0 +1,18 @@
+package json
+
+import (
+	"testing"
+	"unsafe"
+)
+
+func TestDumpOpcode(t *testing.T) {
+	var v interface{} = 1
+	header := (*interfaceHeader)(unsafe.Pointer(&v))
+	typ := header.typ
+	typeptr := uintptr(unsafe.Pointer(typ))
+	codeSet, err := encodeCompileToGetCodeSet(typeptr)
+	if err != nil {
+		t.Fatal(err)
+	}
+	codeSet.code.dump()
+}