vim-patch:8.2.0433: INT signal not properly tested

Problem:    INT signal not properly tested.
Solution:   Add a test.  Also clean up some unnecessary lines. (Dominique
            Pelle, closes vim/vim#5828)

bad8804cdd

src/nvim/testdir/test_display.vim

@@ -195,8 +195,6 @@ func Test_edit_long_file_name()
 
   call VerifyScreenDump(buf, 'Test_long_file_name_1', {})
 
-  call term_sendkeys(buf, ":q\<cr>")
-
   " clean up
   call StopVimInTerminal(buf)
   call delete(longName)

src/nvim/testdir/test_ex_mode.vim

@@ -97,7 +97,6 @@ func Test_Ex_substitute()
   call term_sendkeys(buf, ":vi\<CR>")
   call WaitForAssert({-> assert_match('foo bar', term_getline(buf, 1))}, 1000)
 
-  call term_sendkeys(buf, ":q!\n")
   call StopVimInTerminal(buf)
 endfunc
 

src/nvim/testdir/test_signals.vim

@@ -53,7 +53,7 @@ endfunc
 " Test signal PWR, which should update the swap file.
 func Test_signal_PWR()
   if !HasSignal('PWR')
-    return
+    throw 'Skipped: PWR signal not supported'
   endif
 
   " Set a very large 'updatetime' and 'updatecount', so that we can be sure
@@ -79,6 +79,35 @@ func Test_signal_PWR()
   set updatetime& updatecount&
 endfunc
 
+" Test signal INT. Handler sets got_int. It should be like typing CTRL-C.
+func Test_signal_INT()
+  if !HasSignal('INT')
+    throw 'Skipped: INT signal not supported'
+  endif
+
+  " Skip the rest of the test when running with valgrind as signal INT is not
+  " received somehow by Vim when running with valgrind.
+  let cmd = GetVimCommand()
+  if cmd =~ 'valgrind'
+    throw 'Skipped: cannot test signal INT with valgrind'
+  endif
+
+  if !CanRunVimInTerminal()
+    throw 'Skipped: cannot run vim in terminal'
+  endif
+  let buf = RunVimInTerminal('', {'rows': 6})
+  let pid_vim = term_getjob(buf)->job_info().process
+
+  " Check that an endless loop in Vim is interrupted by signal INT.
+  call term_sendkeys(buf, ":while 1 | endwhile\n")
+  call WaitForAssert({-> assert_equal(':while 1 | endwhile', term_getline(buf, 6))})
+  exe 'silent !kill -s INT ' .. pid_vim
+  call term_sendkeys(buf, ":call setline(1, 'INTERUPTED')\n")
+  call WaitForAssert({-> assert_equal('INTERUPTED', term_getline(buf, 1))})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 " Test a deadly signal.
 "
 " There are several deadly signals: SISEGV, SIBUS, SIGTERM...