From 13350d60c2905a79c313edd4dbd984ed2494dec2 Mon Sep 17 00:00:00 2001
From: meejah <meejah@meejah.ca>
Date: Sun, 22 Dec 2019 02:21:55 -0700
Subject: [PATCH] assertFailure instead of bespoke code

---
 src/allmydata/test/cli/test_start.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/allmydata/test/cli/test_start.py b/src/allmydata/test/cli/test_start.py
index 90fde3969..42c70f024 100644
--- a/src/allmydata/test/cli/test_start.py
+++ b/src/allmydata/test/cli/test_start.py
@@ -256,9 +256,7 @@ class RunTests(unittest.TestCase):
         i, o, e = StringIO(), StringIO(), StringIO()
         d = runner.dispatch(config, i, o, e)
 
-        def must_be_systemexit(f):
-            assert isinstance(f.value, SystemExit)
-        d.addErrback(must_be_systemexit)
+        self.assertFailure(d, SystemExit)
 
         output = e.getvalue()
         # should print out the collected logs and an error-code