test(terminal): status is -1 in TermClose if buffer is deleted (#37609)

runtime/doc/autocmd.txt

@@ -1077,7 +1077,8 @@ TermLeave			After leaving |Terminal-mode|.
 							*TermClose*
 TermClose			When a |terminal| job ends.
 				Sets these |v:event| keys:
-				    status
+				    status	job exit status, or -1 if the
+						terminal buffer is deleted
 							*TermRequest*
 TermRequest			When a |:terminal| child process emits an OSC,
 				DCS, or APC sequence. Sets |v:termrequest|. The

src/nvim/eval/funcs.c

@@ -3632,7 +3632,7 @@ void f_jobstart(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
 
     // Terminal URI: "term://$CWD//$PID:$CMD"
     snprintf(NameBuff, sizeof(NameBuff), "term://%s//%d:%s", IObuff, pid, cmd);
-    // Buffer has no terminal associated yet; unset 'swapfile' to ensure no swapfile is created.
+    // Unset 'swapfile' to ensure no swapfile is created.
     buf->b_p_swf = false;
 
     setfname(buf, NameBuff, NULL, true);

test/functional/autocmd/termxx_spec.lua

@@ -184,6 +184,13 @@ describe('autocmd TermClose', function()
     retry(nil, nil, function()
       eq(42, eval('g:status'))
     end)
+
+    command('set shellcmdflag= | terminal INTERACT')
+    retry(nil, nil, function()
+      matches('^interact %$ ?$', api.nvim_buf_get_lines(0, 0, 1, true)[1])
+    end)
+    command('bwipe!')
+    eq(-1, eval('g:status'))
   end)
 end)
 

test/functional/terminal/buffer_spec.lua

@@ -89,11 +89,10 @@ describe(':terminal buffer', function()
     end)
 
     it('does not create swap files', function()
-      local swapfile = api.nvim_exec('swapname', true):gsub('\n', '')
-      eq(nil, io.open(swapfile))
+      eq('No swap file', n.exec_capture('swapname'))
     end)
 
-    it('does not create undofiles files', function()
+    it('does not create undo files', function()
       local undofile = api.nvim_eval('undofile(bufname("%"))')
       eq(nil, io.open(undofile))
     end)