eval: add wait() test

test/functional/eval/wait_spec.lua

@@ -0,0 +1,81 @@
+local helpers = require('test.functional.helpers')(after_each)
+local call = helpers.call
+local clear = helpers.clear
+local command = helpers.command
+local eval = helpers.eval
+local eq = helpers.eq
+local expect_err = helpers.expect_err
+local feed = helpers.feed
+local feed_command = helpers.feed_command
+local next_msg = helpers.next_msg
+local nvim = helpers.nvim
+local source = helpers.source
+
+before_each(function()
+  clear()
+  local channel = nvim('get_api_info')[1]
+  nvim('set_var', 'channel', channel)
+end)
+
+describe('wait()', function()
+  it('waits and returns 0 when condition is satisfied', function()
+    source([[
+    let g:_awake = 0
+    call timer_start(100, { -> nvim_command('let g:_awake = 1') })
+    ]])
+    eq(0, eval('g:_awake'))
+    eq(0, eval('wait(1500, { -> g:_awake })'))
+    eq(1, eval('g:_awake'))
+
+    eq(0, eval('wait(0, 1)'))
+  end)
+
+  it('returns -1 on timeout', function()
+    eq(-1, eval('wait(0, 0)'))
+    eq(-1, eval('wait(50, 0)'))
+  end)
+
+  it('returns -2 when interrupted', function()
+    feed_command('call rpcnotify(g:channel, "ready") | '..
+                 'call rpcnotify(g:channel, "wait", wait(-1, 0))')
+    eq({'notification', 'ready', {}}, next_msg())
+    feed('<c-c>')
+    eq({'notification', 'wait', {-2}}, next_msg())
+  end)
+
+  it('returns -3 on error', function()
+    command('silent! let ret = wait(-1, "error")')
+    eq(-3, eval('ret'))
+    command('let ret = 0 | silent! let ret = wait(-1, { -> error })')
+    eq(-3, eval('ret'))
+  end)
+
+  it('evaluates the condition on given interval', function()
+    source([[
+    function Count()
+      let g:counter += 1
+      return g:counter
+    endfunction
+    ]])
+
+    nvim('set_var', 'counter', 0)
+    eq(-1, call('wait', 20, 'Count() >= 5'))
+
+    nvim('set_var', 'counter', 0)
+    eq(0, call('wait', 1000, 'Count() >= 5', 5))
+    eq(5, nvim('get_var', 'counter'))
+
+    nvim('set_var', 'counter', 0)
+    eq(0, call('wait', 1000, 'Count() >= 5', 0))
+    eq(5, nvim('get_var', 'counter'))
+  end)
+
+  it('errors out on invalid timeout value', function()
+    expect_err('E475: Invalid argument', call, 'wait', '', 1)
+  end)
+
+  it('errors out on invalid interval', function()
+    expect_err('E475: Invalid argument', call, 'wait', 0, 1, -1)
+    expect_err('E475: Invalid argument', call, 'wait', 0, 1, '')
+  end)
+end)