[tests] Allow stderr to be tested against specified string

Allow bitcoind's stderr to be tested against a specified string on
shutdown.

1 files changed, 7 insertions, 10 deletions

diff --git a/test/functional/feature_includeconf.py b/test/functional/feature_includeconf.py
index d3f1be6c3a..1ead2fcb02 100755
--- a/test/functional/feature_includeconf.py
+++ b/test/functional/feature_includeconf.py
@@ -15,9 +15,8 @@ Verify that:
    file.
 """
 import os
-import tempfile
 
-from test_framework.test_framework import BitcoinTestFramework, assert_equal
+from test_framework.test_framework import BitcoinTestFramework
 
 class IncludeConfTest(BitcoinTestFramework):
     def set_test_params(self):
@@ -44,20 +43,18 @@ class IncludeConfTest(BitcoinTestFramework):
 
         self.log.info("-includeconf cannot be used as command-line arg. subversion should still end with 'main; relative)/'")
         self.stop_node(0)
-        with tempfile.SpooledTemporaryFile(max_size=2**16) as log_stderr:
-            self.start_node(0, extra_args=["-includeconf=relative2.conf"], stderr=log_stderr)
 
-            subversion = self.nodes[0].getnetworkinfo()["subversion"]
-            assert subversion.endswith("main; relative)/")
-            log_stderr.seek(0)
-            stderr = log_stderr.read().decode('utf-8').strip()
-            assert_equal(stderr, 'warning: -includeconf cannot be used from commandline; ignoring -includeconf=relative2.conf')
+        self.start_node(0, extra_args=["-includeconf=relative2.conf"])
+
+        subversion = self.nodes[0].getnetworkinfo()["subversion"]
+        assert subversion.endswith("main; relative)/")
+        self.stop_node(0, expected_stderr="warning: -includeconf cannot be used from commandline; ignoring -includeconf=relative2.conf")
 
         self.log.info("-includeconf cannot be used recursively. subversion should end with 'main; relative)/'")
         with open(os.path.join(self.options.tmpdir, "node0", "relative.conf"), "a", encoding="utf8") as f:
             f.write("includeconf=relative2.conf\n")
 
-        self.restart_node(0)
+        self.start_node(0)
 
         subversion = self.nodes[0].getnetworkinfo()["subversion"]
         assert subversion.endswith("main; relative)/")