Add unit test for explicit err on version mismatch

Author: konradkonrad

rolling-shutter/keyperimpl/shutterservice/eventtrigger_test.go

@@ -2232,3 +2232,26 @@ func Align(val []byte) []byte {
 	copy(x[len(x)-len(val):], val)
 	return x
 }
+
+func TestInvalidVersionDoesNotCrash(t *testing.T) {
+	etd := EventTriggerDefinition{
+		Contract: common.BigToAddress(big.NewInt(65)),
+		LogPredicates: []LogPredicate{
+			{
+				LogValueRef: LogValueRef{Offset: 1},
+				ValuePredicate: ValuePredicate{
+					Op:       BytesEq,
+					ByteArgs: [][]byte{[]byte("some value")},
+				},
+			},
+		},
+	}
+	serialized := etd.MarshalBytes()
+	// change version prefix
+	serialized[0] = 0x1
+
+	dese := EventTriggerDefinition{}
+	err := dese.UnmarshalBytes(serialized)
+
+	assert.Error(t, err, "unsupported version 1, expected 2", err)
+}