Add tests for :oldfiles

test/functional/ex_cmds/oldfiles_spec.lua

@@ -0,0 +1,49 @@
+local h = require('test.functional.helpers')
+
+local buf     = h.curbufmeths
+local command = h.command
+local eq      = h.eq
+local execute = h.execute
+local feed    = h.feed
+local nvim    = h.nvim
+
+local shada_file = 'test.shada'
+
+-- h.clear() uses "-i NONE", which is not useful for this test.
+local function clear()
+  if session then
+    session:exit(0)
+  end
+  h.set_session(h.spawn({h.nvim_prog,
+                         '-u', 'NONE',
+                         '--cmd', 'set noswapfile undodir=. directory=. viewdir=. backupdir=.',
+                         '--embed'}))
+end
+
+describe(':oldfiles', function()
+  before_each(clear)
+
+  it('shows most recently used files', function()
+    command('edit testfile1')
+    command('edit testfile2')
+    command('wshada ' .. shada_file)
+    command('rshada! ' .. shada_file)
+    assert(string.find(nvim('command_output', 'oldfiles'), 'testfile2'))
+    os.remove(shada_file)
+  end)
+end)
+
+describe(':oldfiles!', function()
+  it('provides a file selection prompt and edits the chosen file', function()
+    command('edit testfile1')
+    command('edit testfile2')
+    local filename = buf.get_name()
+    command('wshada ' .. shada_file)
+    clear()
+    command('rshada! ' .. shada_file)
+    execute('oldfiles!')
+    feed('2<cr>')
+    eq(filename, buf.get_name())
+    os.remove(shada_file)
+  end)
+end)