1 files changed, 96 insertions, 0 deletions
diff --git a/test/functional/core/startup_spec.lua b/test/functional/core/startup_spec.lua
new file mode 100644
index 0000000000..ae7f949e52
--- /dev/null
+++ b/test/functional/core/startup_spec.lua
@@ -0,0 +1,96 @@
+local helpers = require('test.functional.helpers')(after_each)
+local Screen = require('test.functional.ui.screen')
+
+local clear = helpers.clear
+local command = helpers.command
+local eq = helpers.eq
+local funcs = helpers.funcs
+local nvim_prog = helpers.nvim_prog
+local nvim_set = helpers.nvim_set
+local read_file = helpers.read_file
+local retry = helpers.retry
+local iswin = helpers.iswin
+
+describe('startup', function()
+  before_each(function()
+    clear()
+  end)
+  after_each(function()
+    os.remove('Xtest_startup_ttyout')
+  end)
+
+  it('pipe at both ends: has("ttyin")==0 has("ttyout")==0', function()
+    -- system() puts a pipe at both ends.
+    local out = funcs.system({ nvim_prog, '-u', 'NONE', '-i', 'NONE', '--headless',
+                               '--cmd', nvim_set,
+                               '-c', [[echo has('ttyin') has('ttyout')]],
+                               '+q' })
+    eq('0 0', out)
+  end)
+  it('with --embed: has("ttyin")==0 has("ttyout")==0', function()
+    local screen = Screen.new(25, 3)
+    -- Remote UI connected by --embed.
+    screen:attach()
+    command([[echo has('ttyin') has('ttyout')]])
+    screen:expect([[
+      ^                         |
+      ~                        |
+      0 0                      |
+    ]])
+  end)
+  it('in a TTY: has("ttyin")==1 has("ttyout")==1', function()
+    local screen = Screen.new(25, 3)
+    screen:attach()
+    if iswin() then
+      command([[set shellcmdflag=/s\ /c shellxquote=\"]])
+    end
+    -- Running in :terminal
+    command([[exe printf("terminal %s -u NONE -i NONE --cmd \"]]
+            ..nvim_set..[[\" ]]
+            ..[[-c \"echo has('ttyin') has('ttyout')\""]]
+            ..[[, shellescape(v:progpath))]])
+    screen:expect([[
+      ^                         |
+      1 1                      |
+                               |
+    ]])
+  end)
+  it('output to pipe: has("ttyin")==1 has("ttyout")==0', function()
+    local screen = Screen.new(25, 5)
+    screen:attach()
+    if iswin() then
+      command([[set shellcmdflag=/s\ /c shellxquote=\"]])
+    end
+    -- Running in :terminal
+    command([[exe printf("terminal %s -u NONE -i NONE --cmd \"]]
+            ..nvim_set..[[\" ]]
+            ..[[-c \"call writefile([has('ttyin'), has('ttyout')], 'Xtest_startup_ttyout')\"]]
+            ..[[-c q | cat -v"]]  -- Output to a pipe.
+            ..[[, shellescape(v:progpath))]])
+    retry(nil, 3000, function()
+      screen:sleep(1)
+      eq('1\n0\n',  -- stdin is a TTY, stdout is a pipe
+         read_file('Xtest_startup_ttyout'))
+    end)
+  end)
+  it('input from pipe: has("ttyin")==0 has("ttyout")==1', function()
+    local screen = Screen.new(25, 5)
+    screen:attach()
+    if iswin() then
+      command([[set shellcmdflag=/s\ /c shellxquote=\"]])
+    end
+    -- Running in :terminal
+    command([[exe printf("terminal echo foo | ]]  -- Input from a pipe.
+            ..[[%s -u NONE -i NONE --cmd \"]]
+            ..nvim_set..[[\" ]]
+            ..[[-c \"call writefile([has('ttyin'), has('ttyout')], 'Xtest_startup_ttyout')\"]]
+            ..[[-c q -- -"]]
+            ..[[, shellescape(v:progpath))]])
+    retry(nil, 3000, function()
+      screen:sleep(1)
+      eq('0\n1\n',  -- stdin is a pipe, stdout is a TTY
+         read_file('Xtest_startup_ttyout'))
+    end)
+  end)
+end)
+