vim-patch:8.0.0{538,539} (#8615)

* vim-patch:8.0.0538: no test for falling back to default term value

Problem:    No test for falling back to default term value.
Solution:   Add a test.
85045a73db

* vim-patch:8.0.0539: startup test fails on Mac

Problem:    Startup test fails on Mac.
Solution:   Use another term name, "unknown" is known. Avoid a 2 second delay.
08f88b139d

* oldtest: nvim does not support ':set term'

src/nvim/testdir/test_startup.vim

@@ -251,3 +251,16 @@ func Test_silent_ex_mode()
   let out = system(GetVimCommand() . '-u NONE -es -c''set verbose=1|h|exe "%norm\<c-y>\<c-d>"'' -c cq')
   call assert_notmatch('E315:', out)
 endfunc
+
+func Test_default_term()
+  if !has('unix') || has('gui_running')
+    " can't get output of Vim.
+    return
+  endif
+
+  let save_term = $TERM
+  let $TERM = 'unknownxxx'
+  let out = system(GetVimCommand() . ' -c ''echo &term'' -c cq')
+  call assert_match('nvim', out)
+  let $TERM = save_term
+endfunc