breacharbiter_test: assert publication of adjusted justice tx

Since the breacharbiter will publish an adjusted justice tx after
detecing a spend from the breached commitment, we could get into a race
where sometime it would not get the second spend before publication,
resulting in a deadlock on the publTx channel.

Now we instead wait for the publication of this adjusted tx before
notifying the second spend.

breacharbiter_test.go

@@ -1978,13 +1978,34 @@ func TestBreachDelayedJusticeConfirmation(t *testing.T) {
 	require.Len(t, spending, len(justiceTx.TxIn))
 	require.Len(t, splits, 2)
 
-	// Finally notify that they confirm, making the breach arbiter clean
-	// up.
-	for _, tx := range splits {
-		for _, in := range tx.TxIn {
+	// Notify that the first split confirm, making the breach arbiter
+	// publish another TX with the remaining inputs.
+	for _, in := range splits[0].TxIn {
 		op := &in.PreviousOutPoint
-			notifier.Spend(op, blockHeight+5, tx)
+		notifier.Spend(op, blockHeight+5, splits[0])
 	}
+
+	select {
+
+	// The published tx should spend the same inputs as our second split.
+	case tx := <-publTx:
+		require.Len(t, tx.TxIn, len(splits[1].TxIn))
+		for i := range tx.TxIn {
+			require.Equal(
+				t, tx.TxIn[i].PreviousOutPoint,
+				splits[1].TxIn[i].PreviousOutPoint,
+			)
+		}
+
+	case <-time.After(5 * time.Second):
+		t.Fatalf("tx not published")
+	}
+
+	// Finally notify that the second split confirms, making the breach
+	// arbiter clean up since all inputs have been swept.
+	for _, in := range splits[1].TxIn {
+		op := &in.PreviousOutPoint
+		notifier.Spend(op, blockHeight+6, splits[1])
 	}
 
 	// Assert that the channel is fully resolved.