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diff --git a/src/testdir/test_matchfuzzy.vim b/src/testdir/test_matchfuzzy.vim
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+" Tests for fuzzy matching
+
+source shared.vim
+source check.vim
+
+" Test for matchfuzzy()
+func Test_matchfuzzy()
+  call assert_fails('call matchfuzzy(10, "abc")', 'E686:')
+  call assert_fails('call matchfuzzy(["abc"], [])', 'E730:')
+  call assert_fails("let x = matchfuzzy(test_null_list(), 'foo')", 'E686:')
+  call assert_fails('call matchfuzzy(["abc"], test_null_string())', 'E475:')
+  call assert_equal([], matchfuzzy([], 'abc'))
+  call assert_equal([], matchfuzzy(['abc'], ''))
+  call assert_equal(['abc'], matchfuzzy(['abc', 10], 'ac'))
+  call assert_equal([], matchfuzzy([10, 20], 'ac'))
+  call assert_equal(['abc'], matchfuzzy(['abc'], 'abc'))
+  call assert_equal(['crayon', 'camera'], matchfuzzy(['camera', 'crayon'], 'cra'))
+  call assert_equal(['aabbaa', 'aaabbbaaa', 'aaaabbbbaaaa', 'aba'], matchfuzzy(['aba', 'aabbaa', 'aaabbbaaa', 'aaaabbbbaaaa'], 'aa'))
+  call assert_equal(['one'], matchfuzzy(['one', 'two'], 'one'))
+  call assert_equal(['oneTwo', 'onetwo'], matchfuzzy(['onetwo', 'oneTwo'], 'oneTwo'))
+  call assert_equal(['onetwo', 'one_two'], matchfuzzy(['onetwo', 'one_two'], 'oneTwo'))
+  call assert_equal(['aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'], matchfuzzy(['aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'], 'aa'))
+  call assert_equal(256, matchfuzzy([repeat('a', 256)], repeat('a', 256))[0]->len())
+  call assert_equal([], matchfuzzy([repeat('a', 300)], repeat('a', 257)))
+  " matches with same score should not be reordered
+  let l = ['abc1', 'abc2', 'abc3']
+  call assert_equal(l, l->matchfuzzy('abc'))
+
+  " Tests for match preferences
+  " preference for camel case match
+  call assert_equal(['oneTwo', 'onetwo'], ['onetwo', 'oneTwo']->matchfuzzy('onetwo'))
+  " preference for match after a separator (_ or space)
+  call assert_equal(['onetwo', 'one_two', 'one two'], ['onetwo', 'one_two', 'one two']->matchfuzzy('onetwo'))
+  " preference for leading letter match
+  call assert_equal(['onetwo', 'xonetwo'], ['xonetwo', 'onetwo']->matchfuzzy('onetwo'))
+  " preference for sequential match
+  call assert_equal(['onetwo', 'oanbectdweo'], ['oanbectdweo', 'onetwo']->matchfuzzy('onetwo'))
+  " non-matching leading letter(s) penalty
+  call assert_equal(['xonetwo', 'xxonetwo'], ['xxonetwo', 'xonetwo']->matchfuzzy('onetwo'))
+  " total non-matching letter(s) penalty
+  call assert_equal(['one', 'onex', 'onexx'], ['onexx', 'one', 'onex']->matchfuzzy('one'))
+  " prefer complete matches over separator matches
+  call assert_equal(['.vim/vimrc', '.vim/vimrc_colors', '.vim/v_i_m_r_c'], ['.vim/vimrc', '.vim/vimrc_colors', '.vim/v_i_m_r_c']->matchfuzzy('vimrc'))
+  " gap penalty
+  call assert_equal(['xxayybxxxx', 'xxayyybxxx', 'xxayyyybxx'], ['xxayyyybxx', 'xxayyybxxx', 'xxayybxxxx']->matchfuzzy('ab'))
+  " path separator vs word separator
+  call assert_equal(['color/setup.vim', 'color\\setup.vim', 'color setup.vim', 'color_setup.vim', 'colorsetup.vim'], matchfuzzy(['colorsetup.vim', 'color setup.vim', 'color/setup.vim', 'color_setup.vim', 'color\\setup.vim'], 'setup.vim'))
+
+  " match multiple words (separated by space)
+  call assert_equal(['foo bar baz'], ['foo bar baz', 'foo', 'foo bar', 'baz bar']->matchfuzzy('baz foo'))
+  call assert_equal([], ['foo bar baz', 'foo', 'foo bar', 'baz bar']->matchfuzzy('one two'))
+  call assert_equal([], ['foo bar']->matchfuzzy(" \t "))
+
+  " test for matching a sequence of words
+  call assert_equal(['bar foo'], ['foo bar', 'bar foo', 'foobar', 'barfoo']->matchfuzzy('bar foo', {'matchseq' : 1}))
+  call assert_equal([#{text: 'two one'}], [#{text: 'one two'}, #{text: 'two one'}]->matchfuzzy('two one', #{key: 'text', matchseq: v:true}))
+
+  %bw!
+  eval ['somebuf', 'anotherone', 'needle', 'yetanotherone']->map({_, v -> bufadd(v) + bufload(v)})
+  let l = getbufinfo()->map({_, v -> v.name})->matchfuzzy('ndl')
+  call assert_equal(1, len(l))
+  call assert_match('needle', l[0])
+
+  " Test for fuzzy matching dicts
+  let l = [{'id' : 5, 'val' : 'crayon'}, {'id' : 6, 'val' : 'camera'}]
+  call assert_equal([{'id' : 6, 'val' : 'camera'}], matchfuzzy(l, 'cam', {'text_cb' : {v -> v.val}}))
+  call assert_equal([{'id' : 6, 'val' : 'camera'}], matchfuzzy(l, 'cam', {'key' : 'val'}))
+  call assert_equal([], matchfuzzy(l, 'day', {'text_cb' : {v -> v.val}}))
+  call assert_equal([], matchfuzzy(l, 'day', {'key' : 'val'}))
+  call assert_fails("let x = matchfuzzy(l, 'cam', 'random')", 'E715:')
+  call assert_equal([], matchfuzzy(l, 'day', {'text_cb' : {v -> []}}))
+  call assert_equal([], matchfuzzy(l, 'day', {'text_cb' : {v -> 1}}))
+  call assert_fails("let x = matchfuzzy(l, 'day', {'text_cb' : {a, b -> 1}})", 'E119:')
+  call assert_equal([], matchfuzzy(l, 'cam'))
+  call assert_fails("let x = matchfuzzy(l, 'cam', {'text_cb' : []})", 'E921:')
+  call assert_fails("let x = matchfuzzy(l, 'foo', {'key' : []})", 'E730:')
+  call assert_fails("let x = matchfuzzy(l, 'cam', test_null_dict())", 'E715:')
+  call assert_fails("let x = matchfuzzy(l, 'foo', {'key' : test_null_string()})", 'E475:')
+  call assert_fails("let x = matchfuzzy(l, 'foo', {'text_cb' : test_null_function()})", 'E475:')
+  " matches with same score should not be reordered
+  let l = [#{text: 'abc', id: 1}, #{text: 'abc', id: 2}, #{text: 'abc', id: 3}]
+  call assert_equal(l, l->matchfuzzy('abc', #{key: 'text'}))
+
+  let l = [{'id' : 5, 'name' : 'foo'}, {'id' : 6, 'name' : []}, {'id' : 7}]
+  call assert_fails("let x = matchfuzzy(l, 'foo', {'key' : 'name'})", 'E730:')
+
+  " Test in latin1 encoding
+  let save_enc = &encoding
+  set encoding=latin1
+  call assert_equal(['abc'], matchfuzzy(['abc'], 'abc'))
+  let &encoding = save_enc
+endfunc
+
+" Test for the matchfuzzypos() function
+func Test_matchfuzzypos()
+  call assert_equal([['curl', 'world'], [[2,3], [2,3]], [128, 127]], matchfuzzypos(['world', 'curl'], 'rl'))
+  call assert_equal([['curl', 'world'], [[2,3], [2,3]], [128, 127]], matchfuzzypos(['world', 'one', 'curl'], 'rl'))
+  call assert_equal([['hello', 'hello world hello world'],
+        \ [[0, 1, 2, 3, 4], [0, 1, 2, 3, 4]], [275, 257]],
+        \ matchfuzzypos(['hello world hello world', 'hello', 'world'], 'hello'))
+  call assert_equal([['aaaaaaa'], [[0, 1, 2]], [191]], matchfuzzypos(['aaaaaaa'], 'aaa'))
+  call assert_equal([['a  b'], [[0, 3]], [219]], matchfuzzypos(['a  b'], 'a  b'))
+  call assert_equal([['a  b'], [[0, 3]], [219]], matchfuzzypos(['a  b'], 'a    b'))
+  call assert_equal([['a  b'], [[0]], [112]], matchfuzzypos(['a  b'], '  a  '))
+  call assert_equal([[], [], []], matchfuzzypos(['a  b'], '  '))
+  call assert_equal([[], [], []], matchfuzzypos(['world', 'curl'], 'ab'))
+  let x = matchfuzzypos([repeat('a', 256)], repeat('a', 256))
+  call assert_equal(range(256), x[1][0])
+  call assert_equal([[], [], []], matchfuzzypos([repeat('a', 300)], repeat('a', 257)))
+  call assert_equal([[], [], []], matchfuzzypos([], 'abc'))
+
+  " match in a long string
+  call assert_equal([[repeat('x', 300) .. 'abc'], [[300, 301, 302]], [-135]],
+        \ matchfuzzypos([repeat('x', 300) .. 'abc'], 'abc'))
+
+  " preference for camel case match
+  call assert_equal([['xabcxxaBc'], [[6, 7, 8]], [189]], matchfuzzypos(['xabcxxaBc'], 'abc'))
+  " preference for match after a separator (_ or space)
+  call assert_equal([['xabx_ab'], [[5, 6]], [145]], matchfuzzypos(['xabx_ab'], 'ab'))
+  " preference for leading letter match
+  call assert_equal([['abcxabc'], [[0, 1]], [150]], matchfuzzypos(['abcxabc'], 'ab'))
+  " preference for sequential match
+  call assert_equal([['aobncedone'], [[7, 8, 9]], [158]], matchfuzzypos(['aobncedone'], 'one'))
+  " best recursive match
+  call assert_equal([['xoone'], [[2, 3, 4]], [168]], matchfuzzypos(['xoone'], 'one'))
+
+  " match multiple words (separated by space)
+  call assert_equal([['foo bar baz'], [[8, 9, 10, 0, 1, 2]], [369]], ['foo bar baz', 'foo', 'foo bar', 'baz bar']->matchfuzzypos('baz foo'))
+  call assert_equal([[], [], []], ['foo bar baz', 'foo', 'foo bar', 'baz bar']->matchfuzzypos('one two'))
+  call assert_equal([[], [], []], ['foo bar']->matchfuzzypos(" \t "))
+  call assert_equal([['grace'], [[1, 2, 3, 4, 2, 3, 4, 0, 1, 2, 3, 4]], [657]], ['grace']->matchfuzzypos('race ace grace'))
+
+  let l = [{'id' : 5, 'val' : 'crayon'}, {'id' : 6, 'val' : 'camera'}]
+  call assert_equal([[{'id' : 6, 'val' : 'camera'}], [[0, 1, 2]], [192]],
+        \ matchfuzzypos(l, 'cam', {'text_cb' : {v -> v.val}}))
+  call assert_equal([[{'id' : 6, 'val' : 'camera'}], [[0, 1, 2]], [192]],
+        \ matchfuzzypos(l, 'cam', {'key' : 'val'}))
+  call assert_equal([[], [], []], matchfuzzypos(l, 'day', {'text_cb' : {v -> v.val}}))
+  call assert_equal([[], [], []], matchfuzzypos(l, 'day', {'key' : 'val'}))
+  call assert_fails("let x = matchfuzzypos(l, 'cam', 'random')", 'E715:')
+  call assert_equal([[], [], []], matchfuzzypos(l, 'day', {'text_cb' : {v -> []}}))
+  call assert_equal([[], [], []], matchfuzzypos(l, 'day', {'text_cb' : {v -> 1}}))
+  call assert_fails("let x = matchfuzzypos(l, 'day', {'text_cb' : {a, b -> 1}})", 'E119:')
+  call assert_equal([[], [], []], matchfuzzypos(l, 'cam'))
+  call assert_fails("let x = matchfuzzypos(l, 'cam', {'text_cb' : []})", 'E921:')
+  call assert_fails("let x = matchfuzzypos(l, 'foo', {'key' : []})", 'E730:')
+  call assert_fails("let x = matchfuzzypos(l, 'cam', test_null_dict())", 'E715:')
+  call assert_fails("let x = matchfuzzypos(l, 'foo', {'key' : test_null_string()})", 'E475:')
+  call assert_fails("let x = matchfuzzypos(l, 'foo', {'text_cb' : test_null_function()})", 'E475:')
+
+  let l = [{'id' : 5, 'name' : 'foo'}, {'id' : 6, 'name' : []}, {'id' : 7}]
+  call assert_fails("let x = matchfuzzypos(l, 'foo', {'key' : 'name'})", 'E730:')
+endfunc
+
+" Test for matchfuzzy() with multibyte characters
+func Test_matchfuzzy_mbyte()
+  CheckFeature multi_lang
+  call assert_equal(['ンヹㄇヺヴ'], matchfuzzy(['ンヹㄇヺヴ'], 'ヹヺ'))
+  " reverse the order of characters
+  call assert_equal([], matchfuzzy(['ンヹㄇヺヴ'], 'ヺヹ'))
+  call assert_equal(['αβΩxxx', 'xαxβxΩx'],
+        \ matchfuzzy(['αβΩxxx', 'xαxβxΩx'], 'αβΩ'))
+  call assert_equal(['ππbbππ', 'πππbbbπππ', 'ππππbbbbππππ', 'πbπ'],
+        \ matchfuzzy(['πbπ', 'ππbbππ', 'πππbbbπππ', 'ππππbbbbππππ'], 'ππ'))
+
+  " match multiple words (separated by space)
+  call assert_equal(['세 마리의 작은 돼지'], ['세 마리의 작은 돼지', '마리의', '마리의 작은', '작은 돼지']->matchfuzzy('돼지 마리의'))
+  call assert_equal([], ['세 마리의 작은 돼지', '마리의', '마리의 작은', '작은 돼지']->matchfuzzy('파란 하늘'))
+
+  " preference for camel case match
+  call assert_equal(['oneĄwo', 'oneąwo'],
+        \ ['oneąwo', 'oneĄwo']->matchfuzzy('oneąwo'))
+  " preference for complete match then match after separator (_ or space)
+  call assert_equal(['ⅠⅡabㄟㄠ'] + sort(['ⅠⅡa_bㄟㄠ', 'ⅠⅡa bㄟㄠ']),
+          \ ['ⅠⅡabㄟㄠ', 'ⅠⅡa bㄟㄠ', 'ⅠⅡa_bㄟㄠ']->matchfuzzy('ⅠⅡabㄟㄠ'))
+  " preference for match after a separator (_ or space)
+  call assert_equal(['ㄓㄔabㄟㄠ', 'ㄓㄔa_bㄟㄠ', 'ㄓㄔa bㄟㄠ'],
+        \ ['ㄓㄔa_bㄟㄠ', 'ㄓㄔa bㄟㄠ', 'ㄓㄔabㄟㄠ']->matchfuzzy('ㄓㄔabㄟㄠ'))
+  " preference for leading letter match
+  call assert_equal(['ŗŝţũŵż', 'xŗŝţũŵż'],
+        \ ['xŗŝţũŵż', 'ŗŝţũŵż']->matchfuzzy('ŗŝţũŵż'))
+  " preference for sequential match
+  call assert_equal(['ㄞㄡㄤfffifl', 'ㄞaㄡbㄤcffdfiefl'],
+        \ ['ㄞaㄡbㄤcffdfiefl', 'ㄞㄡㄤfffifl']->matchfuzzy('ㄞㄡㄤfffifl'))
+  " non-matching leading letter(s) penalty
+  call assert_equal(['xㄞㄡㄤfffifl', 'xxㄞㄡㄤfffifl'],
+        \ ['xxㄞㄡㄤfffifl', 'xㄞㄡㄤfffifl']->matchfuzzy('ㄞㄡㄤfffifl'))
+  " total non-matching letter(s) penalty
+  call assert_equal(['ŗŝţ', 'ŗŝţx', 'ŗŝţxx'],
+        \ ['ŗŝţxx', 'ŗŝţ', 'ŗŝţx']->matchfuzzy('ŗŝţ'))
+endfunc
+
+" Test for matchfuzzypos() with multibyte characters
+func Test_matchfuzzypos_mbyte()
+  CheckFeature multi_lang
+  call assert_equal([['こんにちは世界'], [[0, 1, 2, 3, 4]], [273]],
+        \ matchfuzzypos(['こんにちは世界'], 'こんにちは'))
+  call assert_equal([['ンヹㄇヺヴ'], [[1, 3]], [88]], matchfuzzypos(['ンヹㄇヺヴ'], 'ヹヺ'))
+  " reverse the order of characters
+  call assert_equal([[], [], []], matchfuzzypos(['ンヹㄇヺヴ'], 'ヺヹ'))
+  call assert_equal([['αβΩxxx', 'xαxβxΩx'], [[0, 1, 2], [1, 3, 5]], [222, 113]],
+        \ matchfuzzypos(['αβΩxxx', 'xαxβxΩx'], 'αβΩ'))
+  call assert_equal([['ππbbππ', 'πππbbbπππ', 'ππππbbbbππππ', 'πbπ'],
+        \ [[0, 1], [0, 1], [0, 1], [0, 2]], [151, 148, 145, 110]],
+        \ matchfuzzypos(['πbπ', 'ππbbππ', 'πππbbbπππ', 'ππππbbbbππππ'], 'ππ'))
+  call assert_equal([['ααααααα'], [[0, 1, 2]], [191]],
+        \ matchfuzzypos(['ααααααα'], 'ααα'))
+
+  call assert_equal([[], [], []], matchfuzzypos(['ンヹㄇ', 'ŗŝţ'], 'fffifl'))
+  let x = matchfuzzypos([repeat('Ψ', 256)], repeat('Ψ', 256))
+  call assert_equal(range(256), x[1][0])
+  call assert_equal([[], [], []], matchfuzzypos([repeat('✓', 300)], repeat('✓', 257)))
+
+  " match multiple words (separated by space)
+  call assert_equal([['세 마리의 작은 돼지'], [[9, 10, 2, 3, 4]], [328]], ['세 마리의 작은 돼지', '마리의', '마리의 작은', '작은 돼지']->matchfuzzypos('돼지 마리의'))
+  call assert_equal([[], [], []], ['세 마리의 작은 돼지', '마리의', '마리의 작은', '작은 돼지']->matchfuzzypos('파란 하늘'))
+
+  " match in a long string
+  call assert_equal([[repeat('ぶ', 300) .. 'ẼẼẼ'], [[300, 301, 302]], [-135]],
+        \ matchfuzzypos([repeat('ぶ', 300) .. 'ẼẼẼ'], 'ẼẼẼ'))
+  " preference for camel case match
+  call assert_equal([['xѳѵҁxxѳѴҁ'], [[6, 7, 8]], [189]], matchfuzzypos(['xѳѵҁxxѳѴҁ'], 'ѳѵҁ'))
+  " preference for match after a separator (_ or space)
+  call assert_equal([['xちだx_ちだ'], [[5, 6]], [145]], matchfuzzypos(['xちだx_ちだ'], 'ちだ'))
+  " preference for leading letter match
+  call assert_equal([['ѳѵҁxѳѵҁ'], [[0, 1]], [150]], matchfuzzypos(['ѳѵҁxѳѵҁ'], 'ѳѵ'))
+  " preference for sequential match
+  call assert_equal([['aンbヹcㄇdンヹㄇ'], [[7, 8, 9]], [158]], matchfuzzypos(['aンbヹcㄇdンヹㄇ'], 'ンヹㄇ'))
+  " best recursive match
+  call assert_equal([['xффйд'], [[2, 3, 4]], [168]], matchfuzzypos(['xффйд'], 'фйд'))
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab