test: check that TextChangedT cannot delete terminal buffer (#24437)

2 files changed, 20 insertions, 8 deletions

diff --git a/test/functional/autocmd/termxx_spec.lua b/test/functional/autocmd/termxx_spec.lua
index 9ec1469c03..359203f945 100644
--- a/test/functional/autocmd/termxx_spec.lua
+++ b/test/functional/autocmd/termxx_spec.lua
@@ -1,5 +1,6 @@
 local luv = require('luv')
 local helpers = require('test.functional.helpers')(after_each)
+local thelpers = require('test.functional.terminal.helpers')
 
 local clear, command, nvim, testprg =
   helpers.clear, helpers.command, helpers.nvim, helpers.testprg
@@ -8,6 +9,7 @@ local eval, eq, neq, retry =
 local matches = helpers.matches
 local ok = helpers.ok
 local feed = helpers.feed
+local meths = helpers.meths
 local pcall_err = helpers.pcall_err
 local assert_alive = helpers.assert_alive
 local skip = helpers.skip
@@ -162,3 +164,21 @@ it('autocmd TermEnter, TermLeave', function()
     },
     eval('g:evs'))
 end)
+
+describe('autocmd TextChangedT', function()
+  clear()
+  local screen = thelpers.screen_setup()
+
+  it('works', function()
+    command('autocmd TextChangedT * ++once let g:called = 1')
+    thelpers.feed_data('a')
+    retry(nil, nil, function() eq(1, meths.get_var('called')) end)
+  end)
+
+  it('cannot delete terminal buffer', function()
+    command([[autocmd TextChangedT * call nvim_input('<CR>') | bwipe!]])
+    thelpers.feed_data('a')
+    screen:expect({any = 'E937: '})
+    matches('^E937: Attempt to delete a buffer that is in use: term://', meths.get_vvar('errmsg'))
+  end)
+end)
diff --git a/test/functional/terminal/buffer_spec.lua b/test/functional/terminal/buffer_spec.lua
index 3bc03a4117..9b690bed74 100644
--- a/test/functional/terminal/buffer_spec.lua
+++ b/test/functional/terminal/buffer_spec.lua
@@ -414,14 +414,6 @@ describe('on_lines does not emit out-of-bounds line indexes when', function()
     feed_command('bdelete!')
     eq('', exec_lua([[return _G.cb_error]]))
   end)
-
-  it('runs TextChangedT event', function()
-    meths.set_var('called', 0)
-    command('autocmd TextChangedT * ++once let g:called = 1')
-    feed_command('terminal')
-    feed('iaa')
-    eq(1, meths.get_var('called'))
-  end)
 end)
 
 it('terminal truncates number of composing characters to 5', function()