1 files changed, 16 insertions, 10 deletions

diff --git a/src/nvim/testdir/test_expr_utf8.vim b/src/nvim/testdir/test_expr_utf8.vim
index 00d5d9a63a..7bdcb4f65f 100644
--- a/src/nvim/testdir/test_expr_utf8.vim
+++ b/src/nvim/testdir/test_expr_utf8.vim
@@ -4,29 +4,35 @@ if !has('multi_byte')
 endif
 scriptencoding utf-8
 
-func Test_strgetchar()
+func Test_strgetchar_utf8()
   call assert_equal(char2nr('á'), strgetchar('áxb', 0))
   call assert_equal(char2nr('x'), strgetchar('áxb', 1))
 
-  call assert_equal(-1, strgetchar('axb', -1))
-  call assert_equal(-1, strgetchar('axb', 3))
-  call assert_equal(-1, strgetchar('', 0))
-
-  call assert_equal(char2nr('a'), strgetchar('àxb', 0))
+  call assert_equal(char2nr('a'), strgetchar('àxb', 0))
   call assert_equal(char2nr('̀'), strgetchar('àxb', 1))
-  call assert_equal(char2nr('x'), strgetchar('àxb', 2))
+  call assert_equal(char2nr('x'), strgetchar('àxb', 2))
 
   call assert_equal(char2nr('あ'), strgetchar('あaい', 0))
   call assert_equal(char2nr('a'), strgetchar('あaい', 1))
   call assert_equal(char2nr('い'), strgetchar('あaい', 2))
 endfunc
 
-func Test_strcharpart()
+func Test_strcharpart_utf8()
   call assert_equal('áxb', strcharpart('áxb', 0))
   call assert_equal('á', strcharpart('áxb', 0, 1))
   call assert_equal('x', strcharpart('áxb', 1, 1))
 
-  call assert_equal('a', strcharpart('àxb', 0, 1))
+  call assert_equal('いうeお', strcharpart('あいうeお', 1))
+  call assert_equal('い', strcharpart('あいうeお', 1, 1))
+  call assert_equal('いう', strcharpart('あいうeお', 1, 2))
+  call assert_equal('いうe', strcharpart('あいうeお', 1, 3))
+  call assert_equal('いうeお', strcharpart('あいうeお', 1, 4))
+  call assert_equal('eお', strcharpart('あいうeお', 3))
+  call assert_equal('e', strcharpart('あいうeお', 3, 1))
+
+  call assert_equal('あ', strcharpart('あいうeお', -3, 4))
+
+  call assert_equal('a', strcharpart('àxb', 0, 1))
   call assert_equal('̀', strcharpart('àxb', 1, 1))
-  call assert_equal('x', strcharpart('àxb', 2, 1))
+  call assert_equal('x', strcharpart('àxb', 2, 1))
 endfunc