diff --git a/src/commonTest/kotlin/bipack/BipackEncoderTest.kt b/src/commonTest/kotlin/bipack/BipackEncoderTest.kt
index 43bb310..fe05346 100644
--- a/src/commonTest/kotlin/bipack/BipackEncoderTest.kt
+++ b/src/commonTest/kotlin/bipack/BipackEncoderTest.kt
@@ -183,4 +183,23 @@ class BipackEncoderTest {
 //        println(d.decodeFromBipack<Types1>())
         assertEquals(t1, d.decodeFromBipack())
     }
+
+    @Serializable
+//    @CrcProtected
+//    @Framed
+    data class Inner(val bar: String, val foo: Int)
+
+    @Serializable
+//    @Framed
+    @CrcProtected
+    data class Outer(val i1: Inner,val i2: Inner)
+
+    @Test
+    fun testNEstedProtected() {
+        val x = Outer(Inner("foo", 42), Inner("bar", 117))
+        val d = BipackEncoder.encode(x)
+        println(d.toDump())
+        assertEquals(x, d.decodeFromBipack())
+    }
+
 }
\ No newline at end of file