patch 8.0.0804: terminal window functions not yet implemented

Problem:    Terminal window functions not yet implemented.
Solution:   Implement several functions. Add a first test. (Yasuhiro
            Matsumoto, closes #1871)
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
new file mode 100644
index 0000000..10fe4af
--- /dev/null
+++ b/src/testdir/test_terminal.vim
@@ -0,0 +1,67 @@
+" Tests for the terminal window.
+
+if !exists('*term_start')
+  finish
+endif
+
+source shared.vim
+
+func Test_terminal_basic()
+  let buf = term_start(&shell)
+
+  let termlist = term_list()
+  call assert_equal(1, len(termlist))
+  call assert_equal(buf, termlist[0])
+
+  let g:job = term_getjob(buf)
+  call assert_equal(v:t_job, type(g:job))
+
+  call term_sendkeys(buf, "exit\r")
+  call WaitFor('job_status(g:job) == "dead"')
+  call assert_equal('dead', job_status(g:job))
+
+  exe buf . 'bwipe'
+  unlet g:job
+endfunc
+
+func Check_123(buf)
+  let l = term_scrape(a:buf, 0)
+  call assert_true(len(l) > 0)
+  call assert_equal('1', l[0].chars)
+  call assert_equal('2', l[1].chars)
+  call assert_equal('3', l[2].chars)
+  call assert_equal('#00e000', l[0].fg)
+  if &background == 'light'
+    call assert_equal('#ffffff', l[0].bg)
+  else
+    call assert_equal('#000000', l[0].bg)
+  endif
+
+  let l = term_getline(a:buf, 0)
+  call assert_equal('123', l)
+endfunc
+
+func Test_terminal_scrape()
+  if has('win32')
+    let cmd = 'cmd /c "cls && color 2 && echo 123"'
+  else
+    call writefile(["\<Esc>[32m123"], 'Xtext')
+    let cmd = "cat Xtext"
+  endif
+  let buf = term_start(cmd)
+
+  let termlist = term_list()
+  call assert_equal(1, len(termlist))
+  call assert_equal(buf, termlist[0])
+
+  call term_wait(buf)
+  call Check_123(buf)
+
+  " Must still work after the job ended.
+  let g:job = term_getjob(buf)
+  call WaitFor('job_status(g:job) == "dead"')
+  call term_wait(buf)
+  call Check_123(buf)
+
+  exe buf . 'bwipe'
+endfunc