vim-patch:8.1.1624: when testing in the GUI may try to run gvim in a terminal

Problem:    When testing in the GUI may try to run gvim in a terminal.
Solution:   Add the -v argument. (Yee Cheng Chin, closes vim/vim#4605)  Don't skip
            tests that work now.
0d702028fe

src/nvim/testdir/shared.vim

@@ -294,6 +294,13 @@ func GetVimCommandClean()
   return cmd
 endfunc
 
+" Get the command to run Vim, with --clean, and force to run in terminal so it
+" won't start a new GUI.
+func GetVimCommandCleanTerm()
+  " Add -v to have gvim run in the terminal (if possible)
+  return GetVimCommandClean() .. ' -v '
+endfunc
+
 " Run Vim, using the "vimcmd" file and "-u NORC".
 " "before" is a list of Vim commands to be executed before loading plugins.
 " "after" is a list of Vim commands to be executed after loading plugins.

src/nvim/testdir/test_mapping.vim

@@ -392,7 +392,7 @@ func Test_motionforce_omap()
 endfunc
 
 func Test_error_in_map_expr()
-  if !has('terminal') || has('gui_running')
+  if !has('terminal') || (has('win32') && has('gui_running'))
     throw 'Skipped: cannot run Vim in a terminal window'
   endif
 
@@ -406,7 +406,7 @@ func Test_error_in_map_expr()
   [CODE]
   call writefile(lines, 'Xtest.vim')
 
-  let buf = term_start(GetVimCommandClean() .. ' -S Xtest.vim', {'term_rows': 8})
+  let buf = term_start(GetVimCommandCleanTerm() .. ' -S Xtest.vim', {'term_rows': 8})
   let job = term_getjob(buf)
   call WaitForAssert({-> assert_notequal('', term_getline(buf, 8))})
 

src/nvim/testdir/test_timers.vim

@@ -341,7 +341,7 @@ func Test_nocatch_garbage_collect()
 endfunc
 
 func Test_error_in_timer_callback()
-  if !has('terminal') || has('gui_running')
+  if !has('terminal') || (has('win32') && has('gui_running'))
     throw 'Skipped: cannot run Vim in a terminal window'
   endif
 
@@ -355,7 +355,7 @@ func Test_error_in_timer_callback()
   [CODE]
   call writefile(lines, 'Xtest.vim')
 
-  let buf = term_start(GetVimCommandClean() .. ' -S Xtest.vim', {'term_rows': 8})
+  let buf = term_start(GetVimCommandCleanTerm() .. ' -S Xtest.vim', {'term_rows': 8})
   let job = term_getjob(buf)
   call WaitForAssert({-> assert_notequal('', term_getline(buf, 8))})