From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Date: Thu, 25 May 2017 16:07:45 -0400
Subject: Kill any GnuPG agent before and after the test suite.

This helps to ensure that the test suite daemon is started fresh at
every test suite run.  And it also avoids leaving a daemon running
after the test suite, assuming the test suite manages to reach the
end.

This is considered a reasonable practice by upstream.
---
 t/000_setup.t   | 3 +++
 t/zzz_cleanup.t | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/t/000_setup.t b/t/000_setup.t
index b183241..4dc4329 100644
--- a/t/000_setup.t
+++ b/t/000_setup.t
@@ -17,6 +17,9 @@ TEST
     $agentconf->write("pinentry-program " . getcwd() . "/test/fake-pinentry.pl\n");
     $agentconf->close();
     copy('test/gpg.conf', 'test/gnupghome/gpg.conf');
+    # reset the state of any long-lived gpg-agent, ignoring errors:
+    system('gpgconf', '--homedir=test/gnupghome', '--quiet', '--kill', 'gpg-agent');
+
     reset_handles();
 
     my $pid = $gnupg->import_keys(command_args => [ 'test/public_keys.pgp', 'test/secret_keys.pgp', 'test/new_secret.pgp' ],
diff --git a/t/zzz_cleanup.t b/t/zzz_cleanup.t
index 5c03a72..eea3a48 100644
--- a/t/zzz_cleanup.t
+++ b/t/zzz_cleanup.t
@@ -12,6 +12,8 @@ use File::Path qw (remove_tree);
 TEST
 {
     my $err = [];
+    # kill off any long-lived gpg-agent, ignoring errors:
+    system('gpgconf', '--homedir=test/gnupghome', '--quiet', '--kill', 'gpg-agent');
     remove_tree('test/gnupghome', {error => \$err});
     return ! @$err;
 };