pytest: Minor cleanup

Now using assertRaisesRegex instead of try-except and added restart to
nodes.

Signed-off-by: Christian Decker <decker.christian@gmail.com>

tests/test_lightningd.py

@@ -2168,52 +2168,36 @@ class LightningDTests(BaseLightningDTests):
         l2 = self.node_factory.get_node(options=['--locktime-blocks={}'.format(max_locktime + 1)])
         l1.rpc.connect(l2.info['id'], 'localhost', l2.info['port'])
 
+        funds = 1000000
+
         addr = l1.rpc.newaddr()['address']
-        txid = l1.bitcoin.rpc.sendtoaddress(addr, 0.01)
+        txid = l1.bitcoin.rpc.sendtoaddress(addr, funds / 10**8)
         bitcoind.generate_block(1)
 
         # Wait for it to arrive.
         wait_for(lambda: len(l1.rpc.listfunds()['outputs']) > 0)
 
         # Fail because l1 dislikes l2's huge locktime.
-        try:
-            l1.rpc.fundchannel(l2.info['id'], 100000)
-        except ValueError as verr:
-            str(verr).index('to_self_delay {} larger than {}'
-                            .format(max_locktime+1, max_locktime))
-        except Exception as err:
-            self.fail("Unexpected exception {}".format(err))
-        else:
-            self.fail("huge locktime ignored?")
-
-        # We don't have enough left to cover fees if we try to spend it all.
-        try:
-            l1.rpc.fundchannel(l2.info['id'], 1000000)
-        except ValueError as verr:
-            str(verr).index('Cannot afford funding transaction')
-        except Exception as err:
-            self.fail("Unexpected exception {}".format(err))
-        else:
-            self.fail("We somehow covered fees?")
-
-        # Should still be connected.
+        self.assertRaisesRegex(ValueError, r'to_self_delay \d+ larger than \d+',
+                               l1.rpc.fundchannel, l2.info['id'], int(funds/10))
         assert l1.rpc.getpeers()['peers'][0]['connected']
         assert l2.rpc.getpeers()['peers'][0]['connected']
 
         # Restart l2 without ridiculous locktime.
-        l2.daemon.proc.terminate()
-
         l2.daemon.cmd_line.remove('--locktime-blocks={}'.format(max_locktime + 1))
+        l2.restart()
+        l1.rpc.connect(l2.info['id'], 'localhost', l2.info['port'])
 
-        # Wait for l1 to notice
-        wait_for(lambda: len(l1.rpc.getpeers()['peers']) == 0)
+        # We don't have enough left to cover fees if we try to spend it all.
+        self.assertRaisesRegex(ValueError, r'Cannot afford funding transaction',
+                               l1.rpc.fundchannel, l2.info['id'], funds)
 
-        # Now restart l2, reconnect.
-        l2.daemon.start()
-        l1.rpc.connect(l2.info['id'], 'localhost', l2.info['port'])
+        # Should still be connected.
+        assert l1.rpc.getpeers()['peers'][0]['connected']
+        assert l2.rpc.getpeers()['peers'][0]['connected']
 
         # This works.
-        l1.rpc.fundchannel(l2.info['id'], int(0.01 * 10**8 / 2))
+        l1.rpc.fundchannel(l2.info['id'], int(funds/10))
 
     def test_addfunds_from_block(self):
         """Send funds to the daemon without telling it explicitly

tests/utils.py

@@ -79,8 +79,8 @@ class TailableProc(object):
         self.proc.wait()
         self.thread.join()
 
-        if failed:
-            raise(ValueError("Process '{}' did not cleanly shutdown".format(self.proc.pid)))
+        if self.proc.returncode:
+            raise ValueError("Process '{}' did not cleanly shutdown: return code {}".format(self.proc.pid, rc))
 
         return self.proc.returncode
 
@@ -364,3 +364,17 @@ class LightningNode(object):
             raise ValueError("Node did not exit cleanly, rc={}".format(rc))
         else:
             return rc
+
+    def restart(self, timeout=10, clean=True):
+        """Stop and restart the lightning node.
+
+        Keyword arguments:
+        timeout: number of seconds to wait for a shutdown
+        clean: whether to issue a `stop` RPC command before killing
+        """
+        if clean:
+            self.stop(timeout)
+        else:
+            self.daemon.stop()
+
+        self.daemon.start()