1 files changed, 55 insertions, 0 deletions
diff --git a/test/functional/editor/meta_key_spec.lua b/test/functional/editor/meta_key_spec.lua
new file mode 100644
index 0000000000..2a9541ba96
--- /dev/null
+++ b/test/functional/editor/meta_key_spec.lua
@@ -0,0 +1,55 @@
+local helpers = require('test.functional.helpers')(after_each)
+local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
+local command = helpers.command
+local expect = helpers.expect
+local funcs = helpers.funcs
+local eq = helpers.eq
+
+describe('meta-keys #8226 #13042', function()
+  before_each(function()
+    clear()
+  end)
+
+  it('ALT/META, normal-mode', function()
+    -- Unmapped ALT-chords behave as ESC+c
+    insert('hello')
+    feed('0<A-x><M-x>')
+    expect('llo')
+    -- Mapped ALT-chord behaves as mapped.
+    command('nnoremap <M-l> Ameta-l<Esc>')
+    command('nnoremap <A-j> Aalt-j<Esc>')
+    feed('<A-j><M-l>')
+    expect('lloalt-jmeta-l')
+  end)
+
+  it('ALT/META, visual-mode', function()
+    -- Unmapped ALT-chords behave as ESC+c
+    insert('peaches')
+    feed('viw<A-x>viw<M-x>')
+    expect('peach')
+    -- Mapped ALT-chord behaves as mapped.
+    command('vnoremap <M-l> Ameta-l<Esc>')
+    command('vnoremap <A-j> Aalt-j<Esc>')
+    feed('viw<A-j>viw<M-l>')
+    expect('peachalt-jmeta-l')
+  end)
+
+  it('ALT/META insert-mode', function()
+    -- Mapped ALT-chord behaves as mapped.
+    command('inoremap <M-l> meta-l')
+    command('inoremap <A-j> alt-j')
+    feed('i<M-l> xxx <A-j><M-h>a<A-h>')
+    expect('meta-l xxx alt-j')
+    eq({ 0, 1, 14, 0, }, funcs.getpos('.'))
+    -- Unmapped ALT-chord behaves as ESC+c.
+    command('iunmap <M-l>')
+    feed('0i<M-l>')
+    eq({ 0, 1, 2, 0, }, funcs.getpos('.'))
+    -- Unmapped ALT-chord has same `undo` characteristics as ESC+<key>
+    command('0,$d')
+    feed('ahello<M-.>')
+    expect('hellohello')
+    feed('u')
+    expect('hello')
+  end)
+end)