SIGINT is ignored in the Guix build environment.

--- a/Lib/test/test_regrtest.py
+++ b/Lib/test/test_regrtest.py
@@ -399,6 +399,8 @@
         output = self.run_tests('--fromfile', filename)
         self.check_executed_tests(output, tests)
 
+    @unittest.skipIf(True,
+        "KeyboardInterrupts do not work in the build environment")
     def test_interrupted(self):
         code = TEST_INTERRUPTED
         test = self.create_test('sigint', code=code)
@@ -416,6 +418,8 @@
                  % (self.TESTNAME_REGEX, len(tests)))
         self.check_line(output, regex)
 
+    @unittest.skipIf(True,
+        "KeyboardInterrupts do not work in the build environment")
     def test_slow_interrupted(self):
         # Issue #25373: test --slowest with an interrupted test
         code = TEST_INTERRUPTED
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<div class='path'>path: <a href='/guix/log/?id=d1e77d69c1e04f402cec2e63553c001b1a4664ed'>root</a>/<a href='/guix/log/gnu?id=d1e77d69c1e04f402cec2e63553c001b1a4664ed'>gnu</a>/<a href='/guix/log/gnu/tests?id=d1e77d69c1e04f402cec2e63553c001b1a4664ed'>tests</a>/<a href='/guix/log/gnu/tests/mail.scm?id=d1e77d69c1e04f402cec2e63553c001b1a4664ed'>mail.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/tests/mail.scm?id=d1e77d69c1e04f402cec2e63553c001b1a4664ed&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-03-16 14:05:52 +0100'>2020-03-16</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=a37e03d60e18dfcf119d0b92d9008e54fc350bf1'>tests: opensmtpd: Check /var/spool/mail instead of /var/mail.</a><span class='msg-avail'>...<span class='msg-tooltip'>The test had been failing since the upgrade to 6.6.3p1 in commit
2dbfd8eec43b602d23cee3fdd2842cc333e36c24.

* gnu/services/mail.scm (opensmtpd-activation): Create /var/spool/mail.
* gnu/tests/mail.scm (run-opensmtpd-test): Check /var/spool/mail instead
of /var/mail.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-16 14:05:52 +0100'>2020-03-16</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=c215d9ec1ce108844b14c0c2952199a0da5f4176'>tests: opensmtpd: Gracefully handle test failure.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously the 'wait' loop would run for ~1024 seconds, at which point
we'd reach the file descriptor limit due to the leak in 'queue-empty?'.

* gnu/tests/mail.scm (run-opensmtpd-test)[test]("mail arrived"): In
'queue-empty?', close PIPE to avoid file descriptor leak.  In 'wait'
loop, arrange to run at most 20 times.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-09 23:46:36 +0100'>2020-03-09</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=827abd5deb87c1ec15112d7cde1a03a4ba4b4983'>tests: getmail: Provide a pre-initialized user account password.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests/mail.scm (%getmail-os): Rewrite so that the "alice" account
has a password.
(run-getmail-test)[test]("set password for alice"): Remove.  This would
not work since commit 8b9cad01e9619f53dc5a65892ca6a09ca5de3447 since
'passwd' would no longer be in $PATH.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-31 00:42:48 +0100'>2020-01-31</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=c3f146e79aca0efec5c0cbbf4e39c79e09268c15'>gnu: Update opensmtpd configuration grammar.</a><span class='msg-avail'>...<span class='msg-tooltip'>This follows up on commit 0d486909083c98d7c75cdfc027f89e69f9bf8f48.

* gnu/services/mail.scm (%default-opensmtpd-config-file): Adapt to ‘new’
≥6.4 grammar.
* gnu/tests/mail.scm (%opensmtpd-os): Likewise.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-01-20 19:13:17 +0000'>2020-01-20</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=b3e28b5ef5e23e564eeac8823ad2c837f7c40650'>tests: mail: Remove %getmail-os from the bottom of the file.</a><span class='msg-avail'>...<span class='msg-tooltip'>This was left over when debugging the system test.

* gnu/tests/mail.scm: Remove %getmail-os from the bottom of the file.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2019-06-19 11:49:33 +0200'>2019-06-19</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=bf5929c5303511da338da894ce072c138fe8324f'>tests: Fix opensmtpd test.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests/mail.scm (run-opensmtpd-test) &lt;"mail arrived"&gt;: Invoke
smtpctl by its full file name.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-05-31 20:22:20 +0100'>2019-05-31</span></td><td><a href='/guix/commit/gnu/tests/mail.scm?id=f6b0e1f8ff6a6459d7d39238ced165f4caa988fe'>services: Add getmail.</a><span class='msg-avail'>...<span class='msg-tooltip'>Getmail is a mail retriever written in Python, this commit adds a service-type
to run getmail. I'm looking at this, as it's a convinient way of getting
mailing list messages in to Patchwork.

I initially tried putting this in the (gnu services mail) module, but due to
also trying to use the define-configuration pattern, it conflicted with the
dovecot service.

* gnu/services/getmail.scm: New file.
* gnu/local.mk: Add it.
* gnu/tests/mail.scm (%getmail-os, %test-getmail): New variables.
(run-getmail-test): New procedure.
</span></span></td><td>Christopher Baines</td></tr>