Merge pull request #17368 from zeertzjq/test-filechanged-dialog

test: convert Test_file_changed_dialog() to Lua functional test

src/nvim/testdir/test_filechanged.vim

@@ -91,7 +91,7 @@ func Test_FileChangedShell_reload()
 endfunc
 
 func Test_file_changed_dialog()
-  throw 'skipped: TODO: '
+  throw 'Skipped: requires a UI to a active'
   if !has('unix') || has('gui_running')
     return
   endif

test/functional/legacy/filechanged_spec.lua

@@ -0,0 +1,76 @@
+local helpers = require('test.functional.helpers')(after_each)
+local clear, source = helpers.clear, helpers.source
+local call, eq, meths = helpers.call, helpers.eq, helpers.meths
+
+local function expected_empty()
+  eq({}, meths.get_vvar('errors'))
+end
+
+describe('file changed dialog', function()
+  before_each(function()
+    clear()
+    meths.ui_attach(80, 24, {})
+    meths.set_option('autoread', false)
+    source([[
+      func Test_file_changed_dialog()
+        au! FileChangedShell
+
+        new Xchanged_d
+        call setline(1, 'reload this')
+        write
+        " Need to wait until the timestamp would change by at least a second.
+        sleep 2
+        silent !echo 'extra line' >>Xchanged_d
+        call nvim_input('L')
+        checktime
+        call assert_match('W11:', v:warningmsg)
+        call assert_equal(2, line('$'))
+        call assert_equal('reload this', getline(1))
+        call assert_equal('extra line', getline(2))
+
+        " delete buffer, only shows an error, no prompt
+        silent !rm Xchanged_d
+        checktime
+        call assert_match('E211:', v:warningmsg)
+        call assert_equal(2, line('$'))
+        call assert_equal('extra line', getline(2))
+        let v:warningmsg = 'empty'
+
+        " change buffer, recreate the file and reload
+        call setline(1, 'buffer is changed')
+        silent !echo 'new line' >Xchanged_d
+        call nvim_input('L')
+        checktime
+        call assert_match('W12:', v:warningmsg)
+        call assert_equal(1, line('$'))
+        call assert_equal('new line', getline(1))
+
+        " Only mode changed, reload
+        silent !chmod +x Xchanged_d
+        call nvim_input('L')
+        checktime
+        call assert_match('W16:', v:warningmsg)
+        call assert_equal(1, line('$'))
+        call assert_equal('new line', getline(1))
+
+        " Only time changed, no prompt
+        sleep 2
+        silent !touch Xchanged_d
+        let v:warningmsg = ''
+        checktime
+        call assert_equal('', v:warningmsg)
+        call assert_equal(1, line('$'))
+        call assert_equal('new line', getline(1))
+
+        bwipe!
+        call delete('Xchanged_d')
+      endfunc
+    ]])
+  end)
+
+  it('works', function()
+    if helpers.pending_win32(pending) then return end
+    call('Test_file_changed_dialog')
+    expected_empty()
+  end)
+end)