3 files changed, 53 insertions, 2 deletions
diff --git a/test/functional/api/window_spec.lua b/test/functional/api/window_spec.lua
index 7471f50dbd..ceeb84cec9 100644
--- a/test/functional/api/window_spec.lua
+++ b/test/functional/api/window_spec.lua
@@ -347,4 +347,44 @@ describe('API/win', function()
       eq('', funcs.getcmdwintype())
     end)
   end)
+
+  describe('hide', function()
+    it('can hide current window', function()
+      local oldwin = meths.get_current_win()
+      command('split')
+      local newwin = meths.get_current_win()
+      meths.win_hide(newwin)
+      eq({oldwin}, meths.list_wins())
+    end)
+    it('can hide noncurrent window', function()
+      local oldwin = meths.get_current_win()
+      command('split')
+      local newwin = meths.get_current_win()
+      meths.win_hide(oldwin)
+      eq({newwin}, meths.list_wins())
+    end)
+    it('does not close the buffer', function()
+      local oldwin = meths.get_current_win()
+      local oldbuf = meths.get_current_buf()
+      local buf = meths.create_buf(true, false)
+      local newwin = meths.open_win(buf, true, {
+        relative='win', row=3, col=3, width=12, height=3
+      })
+      meths.win_hide(newwin)
+      eq({oldwin}, meths.list_wins())
+      eq({oldbuf, buf}, meths.list_bufs())
+    end)
+    it('deletes the buffer when bufhidden=wipe', function()
+      local oldwin = meths.get_current_win()
+      local oldbuf = meths.get_current_buf()
+      local buf = meths.create_buf(true, false)
+      local newwin = meths.open_win(buf, true, {
+        relative='win', row=3, col=3, width=12, height=3
+      })
+      meths.buf_set_option(buf, 'bufhidden', 'wipe')
+      meths.win_hide(newwin)
+      eq({oldwin}, meths.list_wins())
+      eq({oldbuf}, meths.list_bufs())
+    end)
+  end)
 end)
diff --git a/test/functional/ex_cmds/excmd_spec.lua b/test/functional/ex_cmds/excmd_spec.lua
index aac2a9f469..33794eb50d 100644
--- a/test/functional/ex_cmds/excmd_spec.lua
+++ b/test/functional/ex_cmds/excmd_spec.lua
@@ -24,8 +24,6 @@ describe('Ex cmds', function()
       pcall_err(command, ':menu 9999999999999999999999999999999999999999'))
     eq('Vim(bdelete):E939: Positive count required',
       pcall_err(command, ':bdelete 9999999999999999999999999999999999999999'))
-    eq('Vim(retab):E487: Argument must be positive',
-      pcall_err(command, ':retab 9999999999999999999999999999999999999999'))
     assert_alive()
   end)
 end)
diff --git a/test/functional/viml/errorlist_spec.lua b/test/functional/viml/errorlist_spec.lua
index 9acc61e398..077d816903 100644
--- a/test/functional/viml/errorlist_spec.lua
+++ b/test/functional/viml/errorlist_spec.lua
@@ -68,4 +68,17 @@ describe('setloclist()', function()
     command('lclose | wincmd w | lopen')
     eq('foo', get_cur_win_var('quickfix_title'))
   end)
+
+  it("doesn't crash when when window is closed in the middle #13721", function()
+    helpers.insert([[
+    hello world]])
+
+    command("vsplit")
+    command("autocmd WinLeave * :call nvim_win_close(0, v:true)")
+
+    command("call setloclist(0, [])")
+    command("lopen")
+
+    helpers.assert_alive()
+  end)
 end)