fix e2e

finality-provider/service/fp_instance.go

@@ -789,6 +789,10 @@ func (fp *FinalityProviderInstance) TestSubmitFinalitySignatureAndExtractPrivKey
 		return nil, nil, fmt.Errorf("failed to send finality signature to the consumer chain: %w", err)
 	}
 
+	if res.TxHash == "" {
+		return res, nil, nil
+	}
+
 	// try to extract the private key
 	var privKey *btcec.PrivateKey
 	for _, ev := range res.Events {

itest/e2e_test.go

@@ -1,6 +1,3 @@
-//go:build e2e
-// +build e2e
-
 package e2etest
 
 import (
@@ -87,9 +84,10 @@ func TestDoubleSigning(t *testing.T) {
 	finalizedBlocks := tm.WaitForNFinalizedBlocks(t, 1)
 
 	// test duplicate vote which should be ignored
-	_, extractedKey, err := fpIns.TestSubmitFinalitySignatureAndExtractPrivKey(finalizedBlocks[0])
+	res, extractedKey, err := fpIns.TestSubmitFinalitySignatureAndExtractPrivKey(finalizedBlocks[0])
 	require.NoError(t, err)
 	require.Nil(t, extractedKey)
+	require.Empty(t, res)
 	t.Logf("duplicate vote for %d is sent", finalizedBlocks[0].Height)
 
 	// attack: manually submit a finality vote over a conflicting block