chainntnfs: fix test testSingleConfirmationNotification

chainntnfs/test/test_interface.go

@@ -41,9 +41,8 @@ func testSingleConfirmationNotification(miner *rpctest.Harness,
 	// function.
 	txid, pkScript, err := chainntnfs.GetTestTxidAndScript(miner)
 	require.NoError(t, err, "unable to create test tx")
-	if err := chainntnfs.WaitForMempoolTx(miner, txid); err != nil {
-		t.Fatalf("tx not relayed to miner: %v", err)
-	}
+	err = chainntnfs.WaitForMempoolTx(miner, txid)
+	require.NoError(t, err, "tx not relayed to miner")
 
 	_, currentHeight, err := miner.Client.GetBestBlock()
 	require.NoError(t, err, "unable to get current height")
@@ -68,6 +67,11 @@ func testSingleConfirmationNotification(miner *rpctest.Harness,
 	blockHash, err := miner.Client.Generate(1)
 	require.NoError(t, err, "unable to generate single block")
 
+	// Assert the above tx is mined in the block.
+	block, err := miner.Client.GetBlock(blockHash[0])
+	require.NoError(t, err)
+	require.Len(t, block.Transactions, 2, "block does not contain tx")
+
 	select {
 	case confInfo := <-confIntent.Confirmed:
 		if !confInfo.BlockHash.IsEqual(blockHash[0]) {