patch 8.2.0742: handling of a TERM signal not tested

Problem:    Handling of a TERM signal not tested.
Solution:   Add a test for SIGTERM. (Dominique Pelle, closes #6055)

src/testdir/test_signals.vim

@@ -106,3 +106,49 @@ func Test_signal_INT()
 
   call StopVimInTerminal(buf)
 endfunc
+
+" Test a deadly signal.
+"
+" There are several deadly signals: SISEGV, SIBUS, SIGTERM...
+" Test uses signal SIGTERM as it does not create a core
+" dump file unlike SIGSEGV, SIGBUS, etc. See "man 7 signals.
+"
+" Vim should exit with a deadly signal and unsaved changes
+" should be recoverable from the swap file preserved as a
+" result of the deadly signal handler.
+func Test_deadly_signal_TERM()
+  if !HasSignal('TERM')
+    throw 'Skipped: TERM signal not supported'
+  endif
+  if !CanRunVimInTerminal()
+    throw 'Skipped: cannot run vim in terminal'
+  endif
+  let cmd = GetVimCommand()
+  if cmd =~ 'valgrind'
+    throw 'Skipped: cannot test signal TERM with valgrind'
+  endif
+
+  let buf = RunVimInTerminal('Xsig_TERM', {'rows': 6})
+  let pid_vim = term_getjob(buf)->job_info().process
+
+  call term_sendkeys(buf, ":call setline(1, 'foo')\n")
+  call WaitForAssert({-> assert_equal('foo', term_getline(buf, 1))})
+
+  call assert_false(filereadable('Xsig_TERM'))
+  exe 'silent !kill -s TERM '  .. pid_vim
+  call WaitForAssert({-> assert_equal('Vim: Caught deadly signal TERM', term_getline(buf, 1))})
+  call WaitForAssert({-> assert_match('Vim: preserving files\.\.\.$', term_getline(buf, 2))})
+  call WaitForAssert({-> assert_true(filereadable('.Xsig_TERM.swp'))})
+
+  " Don't call StopVimInTerminal() as it expects job to be still running.
+  call WaitForAssert({-> assert_equal("finished", term_getstatus(buf))})
+
+  new
+  silent recover .Xsig_TERM.swp
+  call assert_equal(['foo'], getline(1, '$'))
+
+  %bwipe!
+  call delete('.Xsig_TERM.swp')
+endfunc
+
+" vim: ts=8 sw=2 sts=2 tw=80 fdm=marker

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    742,
 /**/
     741,
 /**/