diff --git a/test/unit/termkey_spec.lua b/test/unit/termkey_spec.lua
new file mode 100644
index 0000000000..ffb83d5852
--- /dev/null
+++ b/test/unit/termkey_spec.lua
@@ -0,0 +1,975 @@
+local t = require('test.unit.testutil')
+local itp = t.gen_itp(it)
+local bit = require('bit')
+
+--- @alias TermKeyKey {utf8: string, type: integer, modifiers: integer, code: {codepoint: integer, sym: any, number: integer}}
+
+--- @class termkey
+--- @field TERMKEY_CANON_SPACESYMBOL integer
+--- @field TERMKEY_FLAG_SPACESYMBOL integer
+--- @field TERMKEY_FLAG_UTF8 integer
+--- @field TERMKEY_FORMAT_ALTISMETA integer
+--- @field TERMKEY_FORMAT_CARETCTRL integer
+--- @field TERMKEY_FORMAT_LONGMOD integer
+--- @field TERMKEY_FORMAT_LOWERMOD integer
+--- @field TERMKEY_FORMAT_LOWERSPACE integer
+--- @field TERMKEY_FORMAT_MOUSE_POS integer
+--- @field TERMKEY_FORMAT_SPACEMOD integer
+--- @field TERMKEY_FORMAT_WRAPBRACKET integer
+--- @field TERMKEY_KEYMOD_ALT integer
+--- @field TERMKEY_KEYMOD_CTRL integer
+--- @field TERMKEY_MOUSE_DRAG integer
+--- @field TERMKEY_MOUSE_PRESS integer
+--- @field TERMKEY_MOUSE_RELEASE integer
+--- @field TERMKEY_RES_AGAIN integer
+--- @field TERMKEY_RES_KEY integer
+--- @field TERMKEY_RES_NONE integer
+--- @field TERMKEY_SYM_DOWN integer
+--- @field TERMKEY_SYM_PAGEUP integer
+--- @field TERMKEY_SYM_SPACE integer
+--- @field TERMKEY_SYM_UNKNOWN integer
+--- @field TERMKEY_SYM_UP integer
+--- @field TERMKEY_TYPE_DCS integer
+--- @field TERMKEY_TYPE_FUNCTION integer
+--- @field TERMKEY_TYPE_KEYSYM integer
+--- @field TERMKEY_TYPE_MODEREPORT integer
+--- @field TERMKEY_TYPE_MOUSE integer
+--- @field TERMKEY_TYPE_OSC integer
+--- @field TERMKEY_TYPE_POSITION integer
+--- @field TERMKEY_TYPE_UNICODE integer
+--- @field TERMKEY_TYPE_UNKNOWN_CSI integer
+--- @field termkey_canonicalise fun(any, any):any
+--- @field termkey_destroy fun(any)
+--- @field termkey_get_buffer_remaining fun(any):integer
+--- @field termkey_get_buffer_size fun(any):integer
+--- @field termkey_get_canonflags fun(any):any
+--- @field termkey_get_keyname fun(any, any):any
+--- @field termkey_getkey fun(any, any):any
+--- @field termkey_getkey_force fun(any, any):any
+--- @field termkey_interpret_csi fun(any, any, any, any, any):any
+--- @field termkey_interpret_modereport fun(any, any, any, any, any):any
+--- @field termkey_interpret_mouse fun(any, any, TermKeyKey, integer, integer, integer):any
+--- @field termkey_interpret_position fun(any, any, any, any):any
+--- @field termkey_interpret_string fun(any, TermKeyKey, any):any
+--- @field termkey_lookup_keyname fun(any, any, any):any
+--- @field termkey_new_abstract fun(string, integer):any
+--- @field termkey_push_bytes fun(any, string, integer):integer
+--- @field termkey_set_buffer_size fun(any, integer):integer
+--- @field termkey_set_canonflags fun(any, any):any
+--- @field termkey_set_flags fun(any, integer)
+--- @field termkey_start fun(any):integer
+--- @field termkey_stop fun(any):integer
+--- @field termkey_strfkey fun(any, string, integer, any, any):integer
+local termkey = t.cimport(
+  './src/nvim/tui/termkey/termkey.h',
+  './src/nvim/tui/termkey/termkey-internal.h',
+  './src/nvim/tui/termkey/termkey_defs.h',
+  './src/nvim/tui/termkey/driver-csi.h'
+)
+
+describe('termkey', function()
+  itp('01base', function()
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+    t.neq(tk, nil)
+
+    t.eq(termkey.termkey_get_buffer_size(tk), 256)
+    t.eq(tk.is_started, 1) -- tk->is_started true after construction
+
+    termkey.termkey_stop(tk)
+    t.neq(tk.is_started, 1) -- tk->is_started false after termkey_stop()
+
+    termkey.termkey_start(tk)
+    t.eq(tk.is_started, 1) -- tk->is_started true after termkey_start()
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('02getkey', function()
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+    local key = t.ffi.new('TermKeyKey') ---@type TermKeyKey
+
+    t.eq(termkey.termkey_get_buffer_remaining(tk), 256) -- buffer free initially 256
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_NONE) -- getkey yields RES_NONE when empty
+
+    t.eq(termkey.termkey_push_bytes(tk, 'h', 1), 1) -- push_bytes returns 1
+
+    t.eq(termkey.termkey_get_buffer_remaining(tk), 255) -- buffer free 255 after push_bytes
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY after h
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type after h
+    t.eq(key.code.codepoint, string.byte('h')) -- key.code.codepoint after h
+    t.eq(key.modifiers, 0) -- key.modifiers after h
+    t.eq(t.ffi.string(key.utf8), 'h') -- key.utf8 after h
+
+    t.eq(termkey.termkey_get_buffer_remaining(tk), 256) -- buffer free 256 after getkey
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_NONE) -- getkey yields RES_NONE a second time
+
+    termkey.termkey_push_bytes(tk, '\x01', 1)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY after C-a
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type after C-a
+    t.eq(key.code.codepoint, string.byte('a')) -- key.code.codepoint after C-a
+    t.eq(key.modifiers, termkey.TERMKEY_KEYMOD_CTRL) -- key.modifiers after C-a
+
+    termkey.termkey_push_bytes(tk, '\033OA', 3)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY after Up
+
+    -- is_int(key.type,        TERMKEY_TYPE_KEYSYM,  "key.type after Up");
+    -- is_int(key.code.sym,    TERMKEY_SYM_UP,       "key.code.sym after Up");
+    t.eq(key.modifiers, 0) -- key.modifiers after Up
+
+    t.eq(termkey.termkey_push_bytes(tk, '\033O', 2), 2) -- push_bytes returns 2
+
+    -- is_int(termkey_get_buffer_remaining(tk), 254, "buffer free 254 after partial write");
+
+    -- is_int(termkey_getkey(tk, &key), TERMKEY_RES_AGAIN, "getkey yields RES_AGAIN after partial write");
+
+    termkey.termkey_push_bytes(tk, 'C', 1)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY after Right completion
+
+    -- is_int(key.type,        TERMKEY_TYPE_KEYSYM,  "key.type after Right");
+    -- is_int(key.code.sym,    TERMKEY_SYM_RIGHT,    "key.code.sym after Right");
+    -- is_int(key.modifiers,   0,                    "key.modifiers after Right");
+
+    -- is_int(termkey_get_buffer_remaining(tk), 256, "buffer free 256 after completion");
+
+    termkey.termkey_push_bytes(tk, '\033[27;5u', 7)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY after Ctrl-Escape
+
+    -- is_int(key.type,        TERMKEY_TYPE_KEYSYM, "key.type after Ctrl-Escape");
+    -- is_int(key.code.sym,    TERMKEY_SYM_ESCAPE,  "key.code.sym after Ctrl-Escape");
+    -- is_int(key.modifiers,   TERMKEY_KEYMOD_CTRL, "key.modifiers after Ctrl-Escape");
+
+    termkey.termkey_push_bytes(tk, '\0', 1)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY after Ctrl-Space
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type after Ctrl-Space
+    -- t.eq(key.code.codepoint, string.byte(' ')) -- key.code.codepoint after Ctrl-Space
+    -- is_int(key.modifiers,      TERMKEY_KEYMOD_CTRL,  "key.modifiers after Ctrl-Space");
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('03utf8', function()
+    local tk = termkey.termkey_new_abstract('vt100', termkey.TERMKEY_FLAG_UTF8)
+    local key = t.ffi.new('TermKeyKey') ---@type TermKeyKey
+
+    termkey.termkey_push_bytes(tk, 'a', 1)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY low ASCII
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type low ASCII
+    t.eq(key.code.codepoint, string.byte('a')) -- key.code.codepoint low ASCII
+
+    -- 2-byte UTF-8 range is U+0080 to U+07FF (0xDF 0xBF)
+    -- However, we'd best avoid the C1 range, so we'll start at U+00A0 (0xC2 0xA0)
+
+    termkey.termkey_push_bytes(tk, '\xC2\xA0', 2)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 2 low
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type UTF-8 2 low
+    t.eq(key.code.codepoint, 0x00A0) -- key.code.codepoint UTF-8 2 low
+
+    termkey.termkey_push_bytes(tk, '\xDF\xBF', 2)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 2 high
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type UTF-8 2 high
+    t.eq(key.code.codepoint, 0x07FF) -- key.code.codepoint UTF-8 2 high
+
+    -- 3-byte UTF-8 range is U+0800 (0xE0 0xA0 0x80) to U+FFFD (0xEF 0xBF 0xBD)
+
+    termkey.termkey_push_bytes(tk, '\xE0\xA0\x80', 3)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 3 low
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type UTF-8 3 low
+    t.eq(key.code.codepoint, 0x0800) -- key.code.codepoint UTF-8 3 low
+
+    termkey.termkey_push_bytes(tk, '\xEF\xBF\xBD', 3)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 3 high
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type UTF-8 3 high
+    t.eq(key.code.codepoint, 0xFFFD) -- key.code.codepoint UTF-8 3 high
+
+    -- 4-byte UTF-8 range is U+10000 (0xF0 0x90 0x80 0x80) to U+10FFFF (0xF4 0x8F 0xBF 0xBF)
+
+    termkey.termkey_push_bytes(tk, '\xF0\x90\x80\x80', 4)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 4 low
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type UTF-8 4 low
+    t.eq(key.code.codepoint, 0x10000) -- key.code.codepoint UTF-8 4 low
+
+    termkey.termkey_push_bytes(tk, '\xF4\x8F\xBF\xBF', 4)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 4 high
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type UTF-8 4 high
+    t.eq(key.code.codepoint, 0x10FFFF) -- key.code.codepoint UTF-8 4 high
+
+    -- Invalid continuations
+
+    termkey.termkey_push_bytes(tk, '\xC2!', 2)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 2 invalid cont
+    t.eq(key.code.codepoint, 0xFFFD) -- key.code.codepoint UTF-8 2 invalid cont
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 2 invalid after
+    t.eq(key.code.codepoint, string.byte('!')) -- key.code.codepoint UTF-8 2 invalid after
+
+    termkey.termkey_push_bytes(tk, '\xE0!', 2)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 3 invalid cont
+    t.eq(key.code.codepoint, 0xFFFD) -- key.code.codepoint UTF-8 3 invalid cont
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 3 invalid after
+    t.eq(key.code.codepoint, string.byte('!')) -- key.code.codepoint UTF-8 3 invalid after
+
+    termkey.termkey_push_bytes(tk, '\xE0\xA0!', 3)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 3 invalid cont 2
+    t.eq(key.code.codepoint, 0xFFFD) -- key.code.codepoint UTF-8 3 invalid cont 2
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 3 invalid after
+    t.eq(key.code.codepoint, string.byte('!')) -- key.code.codepoint UTF-8 3 invalid after
+
+    termkey.termkey_push_bytes(tk, '\xF0!', 2)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 4 invalid cont
+    t.eq(key.code.codepoint, 0xFFFD) -- key.code.codepoint UTF-8 4 invalid cont
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 4 invalid after
+    t.eq(key.code.codepoint, string.byte('!')) -- key.code.codepoint UTF-8 4 invalid after
+
+    termkey.termkey_push_bytes(tk, '\xF0\x90!', 3)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 4 invalid cont 2
+    t.eq(key.code.codepoint, 0xFFFD) -- key.code.codepoint UTF-8 4 invalid cont 2
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 4 invalid after
+    t.eq(key.code.codepoint, string.byte('!')) -- key.code.codepoint UTF-8 4 invalid after
+
+    termkey.termkey_push_bytes(tk, '\xF0\x90\x80!', 4)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 4 invalid cont 3
+    t.eq(key.code.codepoint, 0xFFFD) -- key.code.codepoint UTF-8 4 invalid cont 3
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 4 invalid after
+    t.eq(key.code.codepoint, string.byte('!')) -- key.code.codepoint UTF-8 4 invalid after
+
+    -- Partials
+
+    termkey.termkey_push_bytes(tk, '\xC2', 1)
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_AGAIN) -- getkey yields RES_AGAIN UTF-8 2 partial
+
+    termkey.termkey_push_bytes(tk, '\xA0', 1)
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 2 partial
+    t.eq(key.code.codepoint, 0x00A0) -- key.code.codepoint UTF-8 2 partial
+
+    termkey.termkey_push_bytes(tk, '\xE0', 1)
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_AGAIN) -- getkey yields RES_AGAIN UTF-8 3 partial
+
+    termkey.termkey_push_bytes(tk, '\xA0', 1)
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_AGAIN) -- getkey yields RES_AGAIN UTF-8 3 partial
+
+    termkey.termkey_push_bytes(tk, '\x80', 1)
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 3 partial
+    t.eq(key.code.codepoint, 0x0800) -- key.code.codepoint UTF-8 3 partial
+
+    termkey.termkey_push_bytes(tk, '\xF0', 1)
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_AGAIN) -- getkey yields RES_AGAIN UTF-8 4 partial
+
+    termkey.termkey_push_bytes(tk, '\x90', 1)
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_AGAIN) -- getkey yields RES_AGAIN UTF-8 4 partial
+
+    termkey.termkey_push_bytes(tk, '\x80', 1)
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_AGAIN) -- getkey yields RES_AGAIN UTF-8 4 partial
+
+    termkey.termkey_push_bytes(tk, '\x80', 1)
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY UTF-8 4 partial
+    t.eq(key.code.codepoint, 0x10000) -- key.code.codepoint UTF-8 4 partial
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('04flags', function()
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+    local key = t.ffi.new('TermKeyKey') ---@type TermKeyKey
+
+    termkey.termkey_push_bytes(tk, ' ', 1)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY after space
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type after space
+    t.eq(key.code.codepoint, string.byte(' ')) -- key.code.codepoint after space
+    t.eq(key.modifiers, 0) -- key.modifiers after space
+
+    termkey.termkey_set_flags(tk, termkey.TERMKEY_FLAG_SPACESYMBOL)
+
+    termkey.termkey_push_bytes(tk, ' ', 1)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY after space
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_KEYSYM) -- key.type after space with FLAG_SPACESYMBOL
+    t.eq(key.code.sym, termkey.TERMKEY_SYM_SPACE) -- key.code.sym after space with FLAG_SPACESYMBOL
+    t.eq(key.modifiers, 0) -- key.modifiers after space with FLAG_SPACESYMBOL
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('06buffer', function()
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+    local key = t.ffi.new('TermKeyKey') ---@type TermKeyKey
+
+    t.eq(termkey.termkey_get_buffer_remaining(tk), 256) -- buffer free initially 256
+    t.eq(termkey.termkey_get_buffer_size(tk), 256) -- buffer size initially 256
+
+    t.eq(termkey.termkey_push_bytes(tk, 'h', 1), 1) -- push_bytes returns 1
+
+    t.eq(termkey.termkey_get_buffer_remaining(tk), 255) -- buffer free 255 after push_bytes
+    t.eq(termkey.termkey_get_buffer_size(tk), 256) -- buffer size 256 after push_bytes
+
+    t.eq(not not termkey.termkey_set_buffer_size(tk, 512), true) -- buffer set size OK
+
+    t.eq(termkey.termkey_get_buffer_remaining(tk), 511) -- buffer free 511 after push_bytes
+    t.eq(termkey.termkey_get_buffer_size(tk), 512) -- buffer size 512 after push_bytes
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- buffered key still useable after resize
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  local function termkey_keyname2sym(tk, keyname)
+    local sym = t.ffi.new('TermKeySym[1]')
+    local endp = termkey.termkey_lookup_keyname(tk, keyname, sym)
+    if endp == nil then
+      return termkey.TERMKEY_SYM_UNKNOWN
+    end
+    return sym
+  end
+
+  itp('10keyname', function()
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+
+    local sym = termkey_keyname2sym(tk, 'SomeUnknownKey')
+    t.eq(sym, termkey.TERMKEY_SYM_UNKNOWN) -- keyname2sym SomeUnknownKey
+
+    sym = termkey_keyname2sym(tk, 'Space')
+    t.eq(sym[0], termkey.TERMKEY_SYM_SPACE) -- keyname2sym Space
+
+    local _end = termkey.termkey_lookup_keyname(tk, 'Up', sym)
+    t.neq(_end, nil) -- termkey_get_keyname Up returns non-NULL
+    t.eq(t.ffi.string(_end), '') -- termkey_get_keyname Up return points at endofstring
+    t.eq(sym[0], termkey.TERMKEY_SYM_UP) -- termkey_get_keyname Up yields Up symbol
+
+    _end = termkey.termkey_lookup_keyname(tk, 'DownMore', sym)
+    t.neq(_end, nil) -- termkey_get_keyname DownMore returns non-NULL
+    t.eq(t.ffi.string(_end), 'More') -- termkey_get_keyname DownMore return points at More
+    t.eq(sym[0], termkey.TERMKEY_SYM_DOWN) -- termkey_get_keyname DownMore yields Down symbol
+
+    _end = termkey.termkey_lookup_keyname(tk, 'SomeUnknownKey', sym)
+    t.eq(_end, nil) -- termkey_get_keyname SomeUnknownKey returns NULL
+
+    t.eq(t.ffi.string(termkey.termkey_get_keyname(tk, termkey.TERMKEY_SYM_SPACE)), 'Space') -- "get_keyname SPACE");
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('11strfkey', function()
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+    ---@type TermKeyKey
+    local key = t.ffi.new(
+      'TermKeyKey',
+      { type = termkey.TERMKEY_TYPE_UNICODE, code = { codepoint = string.byte('A') } }
+    )
+    local buffer = t.ffi.new('char[16]')
+
+    local len = termkey.termkey_strfkey(tk, buffer, t.ffi.sizeof(buffer), key, 0)
+    t.eq(len, 1) -- length for unicode/A/0
+    t.eq(t.ffi.string(buffer), 'A') -- buffer for unicode/A/0
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      termkey.TERMKEY_FORMAT_WRAPBRACKET
+    )
+    t.eq(len, 1) -- length for unicode/A/0 wrapbracket
+    t.eq(t.ffi.string(buffer), 'A') -- buffer for unicode/A/0 wrapbracket
+
+    ---@type TermKeyKey
+    key = t.ffi.new('TermKeyKey', {
+      type = termkey.TERMKEY_TYPE_UNICODE,
+      code = { codepoint = string.byte('b') },
+      modifiers = termkey.TERMKEY_KEYMOD_CTRL,
+    })
+
+    len = termkey.termkey_strfkey(tk, buffer, t.ffi.sizeof(buffer), key, 0)
+    t.eq(len, 3) -- length for unicode/b/CTRL
+    t.eq(t.ffi.string(buffer), 'C-b') -- buffer for unicode/b/CTRL
+
+    len =
+      termkey.termkey_strfkey(tk, buffer, t.ffi.sizeof(buffer), key, termkey.TERMKEY_FORMAT_LONGMOD)
+    t.eq(len, 6) -- length for unicode/b/CTRL longmod
+    t.eq(t.ffi.string(buffer), 'Ctrl-b') -- buffer for unicode/b/CTRL longmod
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      bit.bor(termkey.TERMKEY_FORMAT_LONGMOD, termkey.TERMKEY_FORMAT_SPACEMOD)
+    )
+    t.eq(len, 6) -- length for unicode/b/CTRL longmod|spacemod
+    t.eq(t.ffi.string(buffer), 'Ctrl b') -- buffer for unicode/b/CTRL longmod|spacemod
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      bit.bor(termkey.TERMKEY_FORMAT_LONGMOD, termkey.TERMKEY_FORMAT_LOWERMOD)
+    )
+    t.eq(len, 6) -- length for unicode/b/CTRL longmod|lowermod
+    t.eq(t.ffi.string(buffer), 'ctrl-b') -- buffer for unicode/b/CTRL longmod|lowermod
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      bit.bor(
+        termkey.TERMKEY_FORMAT_LONGMOD,
+        termkey.TERMKEY_FORMAT_SPACEMOD,
+        termkey.TERMKEY_FORMAT_LOWERMOD
+      )
+    )
+    t.eq(len, 6) -- length for unicode/b/CTRL longmod|spacemod|lowermode
+    t.eq(t.ffi.string(buffer), 'ctrl b') -- buffer for unicode/b/CTRL longmod|spacemod|lowermode
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      termkey.TERMKEY_FORMAT_CARETCTRL
+    )
+    t.eq(len, 2) -- length for unicode/b/CTRL caretctrl
+    t.eq(t.ffi.string(buffer), '^B') -- buffer for unicode/b/CTRL caretctrl
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      termkey.TERMKEY_FORMAT_WRAPBRACKET
+    )
+    t.eq(len, 5) -- length for unicode/b/CTRL wrapbracket
+    t.eq(t.ffi.string(buffer), '<C-b>') -- buffer for unicode/b/CTRL wrapbracket
+
+    ---@type TermKeyKey
+    key = t.ffi.new('TermKeyKey', {
+      type = termkey.TERMKEY_TYPE_UNICODE,
+      code = { codepoint = string.byte('c') },
+      modifiers = termkey.TERMKEY_KEYMOD_ALT,
+    })
+
+    len = termkey.termkey_strfkey(tk, buffer, t.ffi.sizeof(buffer), key, 0)
+    t.eq(len, 3) -- length for unicode/c/ALT
+    t.eq(t.ffi.string(buffer), 'A-c') -- buffer for unicode/c/ALT
+
+    len =
+      termkey.termkey_strfkey(tk, buffer, t.ffi.sizeof(buffer), key, termkey.TERMKEY_FORMAT_LONGMOD)
+    t.eq(len, 5) -- length for unicode/c/ALT longmod
+    t.eq(t.ffi.string(buffer), 'Alt-c') -- buffer for unicode/c/ALT longmod
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      termkey.TERMKEY_FORMAT_ALTISMETA
+    )
+    t.eq(len, 3) -- length for unicode/c/ALT altismeta
+    t.eq(t.ffi.string(buffer), 'M-c') -- buffer for unicode/c/ALT altismeta
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      bit.bor(termkey.TERMKEY_FORMAT_LONGMOD, termkey.TERMKEY_FORMAT_ALTISMETA)
+    )
+    t.eq(len, 6) -- length for unicode/c/ALT longmod|altismeta
+    t.eq(t.ffi.string(buffer), 'Meta-c') -- buffer for unicode/c/ALT longmod|altismeta
+
+    ---@type TermKeyKey
+    key = t.ffi.new(
+      'TermKeyKey',
+      { type = termkey.TERMKEY_TYPE_KEYSYM, code = { sym = termkey.TERMKEY_SYM_UP } }
+    )
+
+    len = termkey.termkey_strfkey(tk, buffer, t.ffi.sizeof(buffer), key, 0)
+    t.eq(len, 2) -- length for sym/Up/0
+    t.eq(t.ffi.string(buffer), 'Up') -- buffer for sym/Up/0
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      termkey.TERMKEY_FORMAT_WRAPBRACKET
+    )
+    t.eq(len, 4) -- length for sym/Up/0 wrapbracket
+    t.eq(t.ffi.string(buffer), '<Up>') -- buffer for sym/Up/0 wrapbracket
+
+    ---@type TermKeyKey
+    key = t.ffi.new(
+      'TermKeyKey',
+      { type = termkey.TERMKEY_TYPE_KEYSYM, code = { sym = termkey.TERMKEY_SYM_PAGEUP } }
+    )
+
+    len = termkey.termkey_strfkey(tk, buffer, t.ffi.sizeof(buffer), key, 0)
+    t.eq(len, 6) -- length for sym/PageUp/0
+    t.eq(t.ffi.string(buffer), 'PageUp') -- buffer for sym/PageUp/0
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      termkey.TERMKEY_FORMAT_LOWERSPACE
+    )
+    t.eq(len, 7) -- length for sym/PageUp/0 lowerspace
+    t.eq(t.ffi.string(buffer), 'page up') -- buffer for sym/PageUp/0 lowerspace
+
+    -- If size of buffer is too small, strfkey should return something consistent
+    len = termkey.termkey_strfkey(tk, buffer, 4, key, 0)
+    t.eq(len, 6) -- length for sym/PageUp/0
+    t.eq(t.ffi.string(buffer), 'Pag') -- buffer of len 4 for sym/PageUp/0
+
+    len = termkey.termkey_strfkey(tk, buffer, 4, key, termkey.TERMKEY_FORMAT_LOWERSPACE)
+    t.eq(len, 7) -- length for sym/PageUp/0 lowerspace
+    t.eq(t.ffi.string(buffer), 'pag') -- buffer of len 4 for sym/PageUp/0 lowerspace
+
+    key = t.ffi.new('TermKeyKey', { type = termkey.TERMKEY_TYPE_FUNCTION, code = { number = 5 } }) ---@type TermKeyKey
+
+    len = termkey.termkey_strfkey(tk, buffer, t.ffi.sizeof(buffer), key, 0)
+    t.eq(len, 2) -- length for func/5/0
+    t.eq(t.ffi.string(buffer), 'F5') -- buffer for func/5/0
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      termkey.TERMKEY_FORMAT_WRAPBRACKET
+    )
+    t.eq(len, 4) -- length for func/5/0 wrapbracket
+    t.eq(t.ffi.string(buffer), '<F5>') -- buffer for func/5/0 wrapbracket
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      termkey.TERMKEY_FORMAT_LOWERSPACE
+    )
+    t.eq(len, 2) -- length for func/5/0 lowerspace
+    t.eq(t.ffi.string(buffer), 'f5') -- buffer for func/5/0 lowerspace
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('13cmpkey', function()
+    local function termkey_keycmp(tk, key1, key2)
+      termkey.termkey_canonicalise(tk, key1)
+      termkey.termkey_canonicalise(tk, key2)
+
+      if key1.type ~= key2.type then
+        return key1.type - key2.type
+      end
+
+      if key1.type == termkey.TERMKEY_TYPE_UNICODE then
+        if key1.code.codepoint ~= key2.code.codepoint then
+          return key1.code.codepoint - key2.code.codepoint
+        end
+      end
+
+      return key1.modifiers - key2.modifiers
+    end
+
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+    ---@type TermKeyKey
+    local key1 = t.ffi.new('TermKeyKey', {
+      type = termkey.TERMKEY_TYPE_UNICODE,
+      code = { codepoint = string.byte('A') },
+      modifiers = 0,
+    })
+    ---@type TermKeyKey
+    local key2 = t.ffi.new('TermKeyKey', {
+      type = termkey.TERMKEY_TYPE_UNICODE,
+      code = { codepoint = string.byte('A') },
+      modifiers = 0,
+    })
+
+    t.eq(termkey_keycmp(tk, key1, key1), 0) -- cmpkey same structure
+    t.eq(termkey_keycmp(tk, key1, key2), 0) -- cmpkey identical structure
+
+    key2.modifiers = termkey.TERMKEY_KEYMOD_CTRL
+
+    t.eq(termkey_keycmp(tk, key1, key2) < 0, true) -- cmpkey orders CTRL after nomod
+    t.eq(termkey_keycmp(tk, key2, key1) > 0, true) -- cmpkey orders nomod before CTRL
+
+    key2.code.codepoint = string.byte('B')
+    key2.modifiers = 0
+
+    t.eq(termkey_keycmp(tk, key1, key2) < 0, true) -- cmpkey orders 'B' after 'A'
+    t.eq(termkey_keycmp(tk, key2, key1) > 0, true) -- cmpkey orders 'A' before 'B'
+
+    key1.modifiers = termkey.TERMKEY_KEYMOD_CTRL
+
+    t.eq(termkey_keycmp(tk, key1, key2) < 0, true) -- cmpkey orders nomod 'B' after CTRL 'A'
+    t.eq(termkey_keycmp(tk, key2, key1) > 0, true) -- cmpkey orders CTRL 'A' before nomod 'B'
+
+    key2.type = termkey.TERMKEY_TYPE_KEYSYM
+    key2.code.sym = termkey.TERMKEY_SYM_UP
+
+    t.eq(termkey_keycmp(tk, key1, key2) < 0, true) -- cmpkey orders KEYSYM after UNICODE
+    t.eq(termkey_keycmp(tk, key2, key1) > 0, true) -- cmpkey orders UNICODE before KEYSYM
+
+    key1.type = termkey.TERMKEY_TYPE_KEYSYM
+    key1.code.sym = termkey.TERMKEY_SYM_SPACE
+    key1.modifiers = 0
+    key2.type = termkey.TERMKEY_TYPE_UNICODE
+    key2.code.codepoint = string.byte(' ')
+    key2.modifiers = 0
+
+    t.eq(termkey_keycmp(tk, key1, key2), 0) -- cmpkey considers KEYSYM/SPACE and UNICODE/SP identical
+
+    termkey.termkey_set_canonflags(
+      tk,
+      bit.bor(termkey.termkey_get_canonflags(tk), termkey.TERMKEY_CANON_SPACESYMBOL)
+    )
+    t.eq(termkey_keycmp(tk, key1, key2), 0) -- "cmpkey considers KEYSYM/SPACE and UNICODE/SP identical under SPACESYMBOL");
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('30mouse', function()
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+    local key = t.ffi.new('TermKeyKey', { type = -1 }) ---@type TermKeyKey
+    local ev = t.ffi.new('TermKeyMouseEvent[1]')
+    local button = t.ffi.new('int[1]')
+    local line = t.ffi.new('int[1]')
+    local col = t.ffi.new('int[1]')
+    local buffer = t.ffi.new('char[32]')
+
+    termkey.termkey_push_bytes(tk, '\x1b[M !!', 6)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for mouse press
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_MOUSE) -- key.type for mouse press
+
+    t.eq(termkey.termkey_interpret_mouse(tk, key, ev, button, line, col), termkey.TERMKEY_RES_KEY) -- interpret_mouse yields RES_KEY
+
+    t.eq(ev[0], termkey.TERMKEY_MOUSE_PRESS) -- mouse event for press
+    t.eq(button[0], 1) -- mouse button for press
+    t.eq(line[0], 1) -- mouse line for press
+    t.eq(col[0], 1) -- mouse column for press
+    t.eq(key.modifiers, 0) -- modifiers for press
+
+    local len = termkey.termkey_strfkey(tk, buffer, t.ffi.sizeof(buffer), key, 0)
+    t.eq(len, 13) -- string length for press
+    t.eq(t.ffi.string(buffer), 'MousePress(1)') -- string buffer for press
+
+    len = termkey.termkey_strfkey(
+      tk,
+      buffer,
+      t.ffi.sizeof(buffer),
+      key,
+      termkey.TERMKEY_FORMAT_MOUSE_POS
+    )
+    t.eq(len, 21) -- string length for press
+    t.eq(t.ffi.string(buffer), 'MousePress(1) @ (1,1)') -- string buffer for press
+
+    termkey.termkey_push_bytes(tk, '\x1b[M@"!', 6)
+
+    termkey.termkey_getkey(tk, key)
+    t.eq(termkey.termkey_interpret_mouse(tk, key, ev, button, line, col), termkey.TERMKEY_RES_KEY) -- interpret_mouse yields RES_KEY
+
+    t.eq(ev[0], termkey.TERMKEY_MOUSE_DRAG) -- mouse event for drag
+    t.eq(button[0], 1) --  mouse button for drag
+    t.eq(line[0], 1) --  mouse line for drag
+    t.eq(col[0], 2) --  mouse column for drag
+    t.eq(key.modifiers, 0) -- modifiers for press
+
+    termkey.termkey_push_bytes(tk, '\x1b[M##!', 6)
+
+    termkey.termkey_getkey(tk, key)
+    t.eq(termkey.termkey_interpret_mouse(tk, key, ev, button, line, col), termkey.TERMKEY_RES_KEY) -- interpret_mouse yields RES_KEY
+
+    t.eq(ev[0], termkey.TERMKEY_MOUSE_RELEASE) -- mouse event for release
+    t.eq(line[0], 1) -- mouse line for release
+    t.eq(col[0], 3) -- mouse column for release
+    t.eq(key.modifiers, 0) -- modifiers for press
+
+    termkey.termkey_push_bytes(tk, '\x1b[M0++', 6)
+
+    termkey.termkey_getkey(tk, key)
+    t.eq(termkey.termkey_interpret_mouse(tk, key, ev, button, line, col), termkey.TERMKEY_RES_KEY) -- interpret_mouse yields RES_KEY
+
+    t.eq(ev[0], termkey.TERMKEY_MOUSE_PRESS) -- mouse event for Ctrl-press
+    t.eq(button[0], 1) -- mouse button for Ctrl-press
+    t.eq(line[0], 11) -- mouse line for Ctrl-press
+    t.eq(col[0], 11) -- mouse column for Ctrl-press
+    t.eq(key.modifiers, termkey.TERMKEY_KEYMOD_CTRL) -- modifiers for Ctrl-press
+
+    len = termkey.termkey_strfkey(tk, buffer, t.ffi.sizeof(buffer), key, 0)
+    t.eq(len, 15) -- string length for Ctrl-press
+    t.eq(t.ffi.string(buffer), 'C-MousePress(1)') -- string buffer for Ctrl-press
+
+    termkey.termkey_push_bytes(tk, '\x1b[M`!!', 6)
+
+    termkey.termkey_getkey(tk, key)
+    t.eq(termkey.termkey_interpret_mouse(tk, key, ev, button, line, col), termkey.TERMKEY_RES_KEY) -- interpret_mouse yields RES_KEY
+
+    t.eq(ev[0], termkey.TERMKEY_MOUSE_PRESS) -- mouse event for wheel down
+    t.eq(button[0], 4) -- mouse button for wheel down
+
+    termkey.termkey_push_bytes(tk, '\x1b[Mb!!', 6)
+
+    termkey.termkey_getkey(tk, key)
+    t.eq(termkey.termkey_interpret_mouse(tk, key, ev, button, line, col), termkey.TERMKEY_RES_KEY) -- interpret_mouse yields RES_KEY
+
+    t.eq(ev[0], termkey.TERMKEY_MOUSE_PRESS) -- mouse event for wheel left
+    t.eq(button[0], 6) -- mouse button for wheel left
+
+    -- rxvt protocol
+    termkey.termkey_push_bytes(tk, '\x1b[0;20;20M', 10)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for mouse press rxvt protocol
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_MOUSE) -- key.type for mouse press rxvt protocol
+
+    t.eq(termkey.termkey_interpret_mouse(tk, key, ev, button, line, col), termkey.TERMKEY_RES_KEY) -- interpret_mouse yields RES_KEY
+
+    t.eq(ev[0], termkey.TERMKEY_MOUSE_PRESS) -- mouse event for press rxvt protocol
+    t.eq(button[0], 1) -- mouse button for press rxvt protocol
+    t.eq(line[0], 20) -- mouse line for press rxvt protocol
+    t.eq(col[0], 20) -- mouse column for press rxvt protocol
+    t.eq(key.modifiers, 0) -- modifiers for press rxvt protocol
+
+    termkey.termkey_push_bytes(tk, '\x1b[3;20;20M', 10)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for mouse release rxvt protocol
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_MOUSE) -- key.type for mouse release rxvt protocol
+
+    t.eq(termkey.termkey_interpret_mouse(tk, key, ev, button, line, col), termkey.TERMKEY_RES_KEY) -- interpret_mouse yields RES_KEY
+
+    t.eq(ev[0], termkey.TERMKEY_MOUSE_RELEASE) -- mouse event for release rxvt protocol
+    t.eq(line[0], 20) -- mouse line for release rxvt protocol
+    t.eq(col[0], 20) -- mouse column for release rxvt protocol
+    t.eq(key.modifiers, 0) -- modifiers for release rxvt protocol
+
+    -- SGR protocol
+    termkey.termkey_push_bytes(tk, '\x1b[<0;30;30M', 11)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for mouse press SGR encoding
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_MOUSE) -- key.type for mouse press SGR encoding
+
+    t.eq(termkey.termkey_interpret_mouse(tk, key, ev, button, line, col), termkey.TERMKEY_RES_KEY) -- interpret_mouse yields RES_KEY
+
+    t.eq(ev[0], termkey.TERMKEY_MOUSE_PRESS) -- mouse event for press SGR
+    t.eq(button[0], 1) -- mouse button for press SGR
+    t.eq(line[0], 30) -- mouse line for press SGR
+    t.eq(col[0], 30) -- mouse column for press SGR
+    t.eq(key.modifiers, 0) -- modifiers for press SGR
+
+    termkey.termkey_push_bytes(tk, '\x1b[<0;30;30m', 11)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for mouse release SGR encoding
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_MOUSE) -- key.type for mouse release SGR encoding
+
+    t.eq(termkey.termkey_interpret_mouse(tk, key, ev, button, line, col), termkey.TERMKEY_RES_KEY) -- interpret_mouse yields RES_KEY
+
+    t.eq(ev[0], termkey.TERMKEY_MOUSE_RELEASE) -- mouse event for release SGR
+
+    termkey.termkey_push_bytes(tk, '\x1b[<0;500;300M', 13)
+
+    termkey.termkey_getkey(tk, key)
+    termkey.termkey_interpret_mouse(tk, key, ev, button, line, col)
+
+    t.eq(line[0], 300) -- mouse line for press SGR wide
+    t.eq(col[0], 500) -- mouse column for press SGR wide
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('31position', function()
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+    local key = t.ffi.new('TermKeyKey') ---@type TermKeyKey
+    local line = t.ffi.new('int[1]')
+    local col = t.ffi.new('int[1]')
+
+    termkey.termkey_push_bytes(tk, '\x1b[?15;7R', 8)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for position report
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_POSITION) -- key.type for position report
+
+    t.eq(termkey.termkey_interpret_position(tk, key, line, col), termkey.TERMKEY_RES_KEY) -- interpret_position yields RES_KEY
+
+    t.eq(line[0], 15) -- line for position report
+    t.eq(col[0], 7) -- column for position report
+
+    -- A plain CSI R is likely to be <F3> though.
+    -- This is tricky :/
+
+    termkey.termkey_push_bytes(tk, '\x1b[R', 3)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for <F3>
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_FUNCTION) -- key.type for <F3>
+    t.eq(key.code.number, 3) -- key.code.number for <F3>
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('32modereport', function()
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+    local key = t.ffi.new('TermKeyKey') ---@type TermKeyKey
+    local initial = t.ffi.new('int[1]')
+    local mode = t.ffi.new('int[1]')
+    local value = t.ffi.new('int[1]')
+
+    termkey.termkey_push_bytes(tk, '\x1b[?1;2$y', 8)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for mode report
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_MODEREPORT) -- key.type for mode report
+
+    t.eq(
+      termkey.termkey_interpret_modereport(tk, key, initial, mode, value),
+      termkey.TERMKEY_RES_KEY
+    ) -- interpret_modereoprt yields RES_KEY
+
+    t.eq(initial[0], 63) -- initial indicator from mode report
+    t.eq(mode[0], 1) -- mode number from mode report
+    t.eq(value[0], 2) -- mode value from mode report
+
+    termkey.termkey_push_bytes(tk, '\x1b[4;1$y', 7)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for mode report
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_MODEREPORT) -- key.type for mode report
+
+    t.eq(
+      termkey.termkey_interpret_modereport(tk, key, initial, mode, value),
+      termkey.TERMKEY_RES_KEY
+    ) -- interpret_modereoprt yields RES_KEY
+
+    t.eq(initial[0], 0) -- initial indicator from mode report
+    t.eq(mode[0], 4) -- mode number from mode report
+    t.eq(value[0], 1) -- mode value from mode report
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('38csi', function()
+    local tk = termkey.termkey_new_abstract('vt100', 0)
+    local key = t.ffi.new('TermKeyKey') ---@type TermKeyKey
+    local args = t.ffi.new('TermKeyCsiParam[16]')
+    local nargs = t.ffi.new('size_t[1]')
+    local command = t.ffi.new('unsigned[1]')
+
+    termkey.termkey_push_bytes(tk, '\x1b[5;25v', 7)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for CSI v
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNKNOWN_CSI) -- key.type for unknown CSI
+
+    t.eq(termkey.termkey_interpret_csi(tk, key, args, nargs, command), termkey.TERMKEY_RES_KEY) -- interpret_csi yields RES_KEY
+
+    t.eq(nargs[0], 2) -- nargs for unknown CSI
+    -- t.eq(args[0],   5) -- args[0] for unknown CSI
+    -- t.eq(args[1],  25) -- args[1] for unknown CSI
+    t.eq(command[0], 118) -- command for unknown CSI
+
+    termkey.termkey_push_bytes(tk, '\x1b[?w', 4)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for CSI ? w
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNKNOWN_CSI) -- key.type for unknown CSI
+    t.eq(termkey.termkey_interpret_csi(tk, key, args, nargs, command), termkey.TERMKEY_RES_KEY) -- interpret_csi yields RES_KEY
+    t.eq(command[0], bit.bor(bit.lshift(63, 8), 119)) -- command for unknown CSI
+
+    termkey.termkey_push_bytes(tk, '\x1b[?$x', 5)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for CSI ? $x
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNKNOWN_CSI) -- key.type for unknown CSI
+    t.eq(termkey.termkey_interpret_csi(tk, key, args, nargs, command), termkey.TERMKEY_RES_KEY) -- interpret_csi yields RES_KEY
+    t.eq(command[0], bit.bor(bit.lshift(36, 16), bit.lshift(63, 8), 120)) -- command for unknown CSI
+
+    termkey.termkey_destroy(tk)
+  end)
+
+  itp('39dcs', function()
+    local tk = termkey.termkey_new_abstract('xterm', 0)
+    local key = t.ffi.new('TermKeyKey') ---@type TermKeyKey
+
+    -- 7bit DCS
+    termkey.termkey_push_bytes(tk, '\x1bP1$r1 q\x1b\\', 10)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for DCS
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_DCS) -- key.type for DCS
+    t.eq(key.modifiers, 0) -- key.modifiers for DCS
+
+    local str = t.ffi.new('const char*[1]')
+    t.eq(termkey.termkey_interpret_string(tk, key, str), termkey.TERMKEY_RES_KEY) -- termkey_interpret_string() gives string
+    t.eq(t.ffi.string(str[0]), '1$r1 q') -- termkey_interpret_string() yields correct string
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_NONE) -- getkey again yields RES_NONE
+
+    -- 8bit DCS
+    termkey.termkey_push_bytes(tk, '\x901$r2 q\x9c', 8)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for DCS
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_DCS) -- key.type for DCS
+    t.eq(key.modifiers, 0) -- key.modifiers for DCS
+
+    t.eq(termkey.termkey_interpret_string(tk, key, str), termkey.TERMKEY_RES_KEY) -- "termkey_interpret_string() gives string");
+    t.eq(t.ffi.string(str[0]), '1$r2 q') -- "termkey_interpret_string() yields correct string");
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_NONE) -- "getkey again yields RES_NONE");
+
+    -- 7bit OSC
+    termkey.termkey_push_bytes(tk, '\x1b]15;abc\x1b\\', 10)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_KEY) -- getkey yields RES_KEY for OSC
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_OSC) -- key.type for OSC
+    t.eq(key.modifiers, 0) -- key.modifiers for OSC
+
+    t.eq(termkey.termkey_interpret_string(tk, key, str), termkey.TERMKEY_RES_KEY) -- "termkey_interpret_string() gives string");
+    t.eq(t.ffi.string(str[0]), '15;abc') -- "termkey_interpret_string() yields correct string");
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_NONE) -- getkey again yields RES_NONE
+
+    -- False alarm
+    termkey.termkey_push_bytes(tk, '\x1bP', 2)
+
+    t.eq(termkey.termkey_getkey(tk, key), termkey.TERMKEY_RES_AGAIN) -- getkey yields RES_AGAIN for false alarm
+
+    t.eq(termkey.termkey_getkey_force(tk, key), termkey.TERMKEY_RES_KEY) -- getkey_force yields RES_KEY for false alarm
+
+    t.eq(key.type, termkey.TERMKEY_TYPE_UNICODE) -- key.type for false alarm
+    t.eq(key.code.codepoint, string.byte('P')) -- key.code.codepoint for false alarm
+    t.eq(key.modifiers, termkey.TERMKEY_KEYMOD_ALT) -- key.modifiers for false alarm
+
+    termkey.termkey_destroy(tk)
+  end)
+end)