vim-patch:8.2.0456: Test_confirm_cmd is flaky

Problem:    Test_confirm_cmd is flaky.
Solution:   Add a term_wait() call. (closes vim/vim#5854)
https://github.com/vim/vim/commit/72749f062f15c7147f512bc581695c25ad78fb4e

Cherry-pick Test_confirm_cmd() from patch v8.2.0203
because that patch modifies multiple files.
Copied code is based on Test_confirm_cmd() as of patch v8.2.0456.

N/A patches for version.c:

vim-patch:8.2.2274: badge for Travis is outdated

Problem:    badge for Travis is outdated.
Solution:   Update badge for move from travis-ci.org to travis-ci.com.
https://github.com/vim/vim/commit/2f91e2f8da572123e53ae7579dde57c750137def

vim-patch:8.2.2277: missing backslash

Problem:    Missing backslash.
Solution:   Add backslash.
https://github.com/vim/vim/commit/9281c6cae4e1cec2c661487d761d407bad7c6ad6

1 files changed, 75 insertions, 0 deletions

diff --git a/src/nvim/testdir/test_excmd.vim b/src/nvim/testdir/test_excmd.vim
index 4a027c3864..28ac2f65f6 100644
--- a/src/nvim/testdir/test_excmd.vim
+++ b/src/nvim/testdir/test_excmd.vim
@@ -1,5 +1,7 @@
 " Tests for various Ex commands.
 
+source check.vim
+
 func Test_ex_delete()
   new
   call setline(1, ['a', 'b', 'c'])
@@ -40,3 +42,76 @@ func Test_buffers_lastused()
   bwipeout bufb
   bwipeout bufc
 endfunc
+
+" Test for the :confirm command dialog
+func Test_confirm_cmd()
+  CheckNotGui
+  CheckRunVimInTerminal
+  call writefile(['foo1'], 'foo')
+  call writefile(['bar1'], 'bar')
+  " Test for saving all the modified buffers
+  let buf = RunVimInTerminal('', {'rows': 20})
+  call term_sendkeys(buf, ":set nomore\n")
+  call term_sendkeys(buf, ":new foo\n")
+  call term_sendkeys(buf, ":call setline(1, 'foo2')\n")
+  call term_sendkeys(buf, ":new bar\n")
+  call term_sendkeys(buf, ":call setline(1, 'bar2')\n")
+  call term_sendkeys(buf, ":wincmd b\n")
+  call term_sendkeys(buf, ":confirm qall\n")
+  call WaitForAssert({-> assert_match('\[Y\]es, (N)o, Save (A)ll, (D)iscard All, (C)ancel: ', term_getline(buf, 20))}, 1000)
+  call term_sendkeys(buf, "A")
+  call StopVimInTerminal(buf)
+  call assert_equal(['foo2'], readfile('foo'))
+  call assert_equal(['bar2'], readfile('bar'))
+  " Test for discarding all the changes to modified buffers
+  let buf = RunVimInTerminal('', {'rows': 20})
+  call term_sendkeys(buf, ":set nomore\n")
+  call term_sendkeys(buf, ":new foo\n")
+  call term_sendkeys(buf, ":call setline(1, 'foo3')\n")
+  call term_sendkeys(buf, ":new bar\n")
+  call term_sendkeys(buf, ":call setline(1, 'bar3')\n")
+  call term_sendkeys(buf, ":wincmd b\n")
+  call term_sendkeys(buf, ":confirm qall\n")
+  call WaitForAssert({-> assert_match('\[Y\]es, (N)o, Save (A)ll, (D)iscard All, (C)ancel: ', term_getline(buf, 20))}, 1000)
+  call term_sendkeys(buf, "D")
+  call StopVimInTerminal(buf)
+  call assert_equal(['foo2'], readfile('foo'))
+  call assert_equal(['bar2'], readfile('bar'))
+  " Test for saving and discarding changes to some buffers
+  let buf = RunVimInTerminal('', {'rows': 20})
+  call term_sendkeys(buf, ":set nomore\n")
+  call term_sendkeys(buf, ":new foo\n")
+  call term_sendkeys(buf, ":call setline(1, 'foo4')\n")
+  call term_sendkeys(buf, ":new bar\n")
+  call term_sendkeys(buf, ":call setline(1, 'bar4')\n")
+  call term_sendkeys(buf, ":wincmd b\n")
+  call term_sendkeys(buf, ":confirm qall\n")
+  call WaitForAssert({-> assert_match('\[Y\]es, (N)o, Save (A)ll, (D)iscard All, (C)ancel: ', term_getline(buf, 20))}, 1000)
+  call term_sendkeys(buf, "N")
+  call WaitForAssert({-> assert_match('\[Y\]es, (N)o, (C)ancel: ', term_getline(buf, 20))}, 1000)
+  call term_sendkeys(buf, "Y")
+  call StopVimInTerminal(buf)
+  call assert_equal(['foo4'], readfile('foo'))
+  call assert_equal(['bar2'], readfile('bar'))
+
+  call delete('foo')
+  call delete('bar')
+endfunc
+
+func Test_confirm_cmd_cancel()
+  " Test for closing a window with a modified buffer
+  let buf = RunVimInTerminal('', {'rows': 20})
+  call term_sendkeys(buf, ":set nomore\n")
+  call term_sendkeys(buf, ":new\n")
+  call term_sendkeys(buf, ":call setline(1, 'abc')\n")
+  call term_sendkeys(buf, ":confirm close\n")
+  call WaitForAssert({-> assert_match('^\[Y\]es, (N)o, (C)ancel: *$',
+        \ term_getline(buf, 20))}, 1000)
+  call term_sendkeys(buf, "C")
+  call term_wait(buf, 50)
+  call term_sendkeys(buf, ":confirm close\n")
+  call WaitForAssert({-> assert_match('^\[Y\]es, (N)o, (C)ancel: *$',
+        \ term_getline(buf, 20))}, 1000)
+  call term_sendkeys(buf, "N")
+  call StopVimInTerminal(buf)
+endfunc