fix(string): fix string2chars function test for vim

skip chinese test for old vim

autoload/SpaceVim/api/data/string.vim

@@ -120,7 +120,10 @@ endfunction
 
 
 " note: this function only works when encoding is utf-8
-" ref: https://github.com/SpaceVim/SpaceVim/pull/2515
+" old vim always add ^@ after chinese char.
+" and it is fixed in 8.1.2269 ~ 8.2.3395
+" and I do not know which patch fix it.
+" @bug find the patch for split-\zs
 function! s:self.string2chars(str) abort
   let save_enc = &encoding
   let &encoding = 'utf-8'

test/api/data/chinese_str.vader

@@ -0,0 +1,10 @@
+Execute ( SpaceVim api: data#string ):
+  if !has('patch-8.2.3395')
+    finish
+  endif
+  let str = SpaceVim#api#import('data#string')
+  AssertEqual str.string2chars('你好'), ['你', '好']
+  Log 'test strQ2B()'
+  AssertEqual str.strQ2B('％'), '%'
+  Log 'test strB2Q()'
+  AssertEqual str.strB2Q('%'), '％'

test/api/data/string.vader

@@ -31,11 +31,6 @@ Execute ( SpaceVim api: data#string ):
   AssertEqual str.trim_start(' s b '), 's b '
   Log 'test string2chars()'
   AssertEqual str.string2chars(' a b '), [' ', 'a', ' ', 'b', ' ']
-  AssertEqual str.string2chars('你好'), ['你', '好']
-  Log 'test strQ2B()'
-  AssertEqual str.strQ2B('％'), '%'
-  Log 'test strB2Q()'
-  AssertEqual str.strB2Q('%'), '％'
   AssertEqual str.trim_end(' s b '), ' s b'
   AssertEqual str.fill_middle('s b', 10), '   s b    '
   AssertEqual str.strAllIndex('hello spacevim hello', 'hello', 0), [[0, 5], [15, 20]]