daemon/test: test unilateral close.

We use dev-disconnect to convince one node the other has disconnected
(but not vice versa), to get deterministic behaviour.  We do this with
one HTLC outstanding, to test the HTLC timeout path.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

daemon/test/test.sh

@@ -49,6 +49,9 @@ while [ $# != 0 ]; do
 	x"--timeout-anchor")
 	    TIMEOUT_ANCHOR=1
 	    ;;
+	x"--dump-onchain")
+	    DUMP_ONCHAIN=1
+	    ;;
 	x"--verbose")
 	    VERBOSE=1
 	    ;;
@@ -363,6 +366,52 @@ check_status_single lcli2 $B_AMOUNT $B_FEE "" $A_AMOUNT $A_FEE '{ "msatoshis" :
 lcli2 commit $ID1
 check_status $A_AMOUNT $A_FEE '{ "msatoshis" : '$HTLC_AMOUNT', "expiry" : { "second" : '$EXPIRY' }, "rhash" : "'$RHASH'" } ' $B_AMOUNT $B_FEE ""
 
+if [ -n "$DUMP_ONCHAIN" ]; then
+    # make node1 disconnect with node2.
+    lcli1 dev-disconnect $ID2
+    check_peerconnected lcli1 false
+
+    # lcli1 should have sent out commitment tx
+    check_tx_spend
+
+    # Now lcli2 sees it.
+    sleep 1
+    check_peerstate lcli1 STATE_CLOSE_ONCHAIN_OUR_UNILATERAL
+    check_peerstate lcli2 STATE_CLOSE_ONCHAIN_THEIR_UNILATERAL
+
+    # both still know about htlc
+    check_status $A_AMOUNT $A_FEE '{ "msatoshis" : '$HTLC_AMOUNT', "expiry" : { "second" : '$EXPIRY' }, "rhash" : "'$RHASH'" } ' $B_AMOUNT $B_FEE ""
+
+    # Move bitcoind's time so CSV timeout has expired.
+    $CLI setmocktime $((`date +%s` + 600))
+    $CLI generate 6
+
+    # Now, lcli1 should spend its own output.
+    sleep 2
+    check_tx_spend
+    check_peerstate lcli1 STATE_CLOSE_ONCHAIN_OUR_UNILATERAL
+
+    # Move bitcoind's time so HTLC has expired.
+    $CLI setmocktime $(($EXPIRY + 1))
+    $CLI generate 6
+
+    # Wait for nodes to notice
+    sleep 2
+
+    # lcli1 should have gotten HTLC back.
+    check_tx_spend
+
+    # Now, after 100 blocks, should all be concluded.
+    $CLI generate 100
+    sleep 5
+
+    # Both consider it all done now.
+    check_no_peers lcli1
+
+    lcli1 stop
+    all_ok
+fi
+    
 lcli2 fulfillhtlc $ID1 $SECRET
 lcli2 commit $ID1
 lcli1 commit $ID2