diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index d942d07..3d81048 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -106,11 +106,9 @@
     call assert_equal(4, strwidth(1234))
     call assert_equal(5, strwidth(-1234))
 
-    if has('multi_byte')
-      call assert_equal(2, strwidth('😉'))
-      call assert_equal(17, strwidth('Eĥoŝanĝo ĉiuĵaŭde'))
-      call assert_equal((aw == 'single') ? 6 : 7, strwidth('Straße'))
-    endif
+    call assert_equal(2, strwidth('😉'))
+    call assert_equal(17, strwidth('Eĥoŝanĝo ĉiuĵaŭde'))
+    call assert_equal((aw == 'single') ? 6 : 7, strwidth('Straße'))
 
     call assert_fails('call strwidth({->0})', 'E729:')
     call assert_fails('call strwidth([])', 'E730:')
@@ -277,10 +275,8 @@
   call assert_equal('fg', strpart('abcdefg', 5, 4))
   call assert_equal('defg', strpart('abcdefg', 3))
 
-  if has('multi_byte')
-    call assert_equal('lép', strpart('éléphant', 2, 4))
-    call assert_equal('léphant', strpart('éléphant', 2))
-  endif
+  call assert_equal('lép', strpart('éléphant', 2, 4))
+  call assert_equal('léphant', strpart('éléphant', 2))
 endfunc
 
 func Test_tolower()
@@ -290,10 +286,6 @@
   call assert_equal(' !"#$%&''()*+,-./0123456789:;<=>?@abcdefghijklmnopqrstuvwxyz[\]^_`abcdefghijklmnopqrstuvwxyz{|}~',
           \ tolower(' !"#$%&''()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~'))
 
-  if !has('multi_byte')
-    return
-  endif
-
   " Test with a few uppercase diacritics.
   call assert_equal("aàáâãäåāăąǎǟǡả", tolower("AÀÁÂÃÄÅĀĂĄǍǞǠẢ"))
   call assert_equal("bḃḇ", tolower("BḂḆ"))
@@ -368,10 +360,6 @@
   call assert_equal(' !"#$%&''()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`ABCDEFGHIJKLMNOPQRSTUVWXYZ{|}~',
           \ toupper(' !"#$%&''()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~'))
 
-  if !has('multi_byte')
-    return
-  endif
-
   " Test with a few lowercase diacritics.
   call assert_equal("AÀÁÂÃÄÅĀĂĄǍǞǠẢ", toupper("aàáâãäåāăąǎǟǡả"))
   call assert_equal("BḂḆ", toupper("bḃḇ"))