diff --git a/src/testdir/test_expand.vim b/src/testdir/test_expand.vim
index bd8021f..53f753d 100644
--- a/src/testdir/test_expand.vim
+++ b/src/testdir/test_expand.vim
@@ -58,7 +58,7 @@
   call assert_equal('e Xfile1', expandcmd('e %'))
   edit Xfile2
   edit Xfile1
-  call assert_equal('e Xfile2', expandcmd('e #'))
+  call assert_equal('e Xfile2', 'e #'->expandcmd())
   edit Xfile2
   edit Xfile3
   edit Xfile4
diff --git a/src/testdir/test_expand_func.vim b/src/testdir/test_expand_func.vim
index f6e5293..f9c5b5f 100644
--- a/src/testdir/test_expand_func.vim
+++ b/src/testdir/test_expand_func.vim
@@ -68,7 +68,7 @@
 func Test_expand()
   new
   call assert_equal("",  expand('%:S'))
-  call assert_equal('3', expand('<slnum>'))
+  call assert_equal('3', '<slnum>'->expand())
   call assert_equal(['4'], expand('<slnum>', v:false, v:true))
   " Don't add any line above this, otherwise <slnum> will change.
   quit
diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index ccca792..9f43732 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -403,7 +403,7 @@
   call assert_equal(string(value), printf('%s', value))
 
   " funcref
-  call assert_equal('printf', printf('%s', function('printf')))
+  call assert_equal('printf', printf('%s', 'printf'->function()))
 
   " partial
   call assert_equal(string(function('printf', ['%s'])), printf('%s', function('printf', ['%s'])))
@@ -490,7 +490,7 @@
   endfunc
   call assert_equal(2, OneByName())
   call assert_equal(1, OneByRef())
-  let OneByRef = funcref('One')
+  let OneByRef = 'One'->funcref()
   call assert_equal(2, OneByRef())
   call assert_fails('echo funcref("{")', 'E475:')
 endfunc
diff --git a/src/testdir/test_findfile.vim b/src/testdir/test_findfile.vim
index 0bae161..5cda2ea 100644
--- a/src/testdir/test_findfile.vim
+++ b/src/testdir/test_findfile.vim
@@ -50,7 +50,7 @@
   set path=.
   call assert_equal('Xdir2/foo',    findfile('foo'))
   call assert_equal('',             findfile('bar'))
-  call assert_equal('Xdir2/foobar', findfile('foobar'))
+  call assert_equal('Xdir2/foobar', 'foobar'->findfile())
 
   " Empty {path} 2nd argument is the same as no 2nd argument.
   call assert_equal('Xdir2/foo', findfile('foo', ''))
@@ -137,7 +137,7 @@
   cd Xdir1
 
   call assert_equal('Xdir2', finddir('Xdir2'))
-  call assert_equal('',      finddir('Xdir3'))
+  call assert_equal('',      'Xdir3'->finddir())
 
   " Files should not be found (findfile() finds them).
   call assert_equal('', finddir('foo'))
diff --git a/src/testdir/test_fnameescape.vim b/src/testdir/test_fnameescape.vim
index 5382b89..b0fdb3a 100644
--- a/src/testdir/test_fnameescape.vim
+++ b/src/testdir/test_fnameescape.vim
@@ -13,7 +13,7 @@
   let fname = 'Xemark!'
   let status = v:false
   try
-    exe "w! " . fnameescape(fname)
+    exe "w! " . fname->fnameescape()
     let status = v:true
   endtry
   call assert_true(status, "ExclamationMark")
diff --git a/src/testdir/test_fnamemodify.vim b/src/testdir/test_fnamemodify.vim
index 63f2736..fd5f1ef 100644
--- a/src/testdir/test_fnamemodify.vim
+++ b/src/testdir/test_fnamemodify.vim
@@ -13,7 +13,7 @@
   call assert_equal('a', fnamemodify('../testdir/a', ':.'))
   call assert_equal('~/testdir/test.out', fnamemodify('test.out', ':~'))
   call assert_equal('~/testdir/a', fnamemodify('../testdir/a', ':~'))
-  call assert_equal('a', fnamemodify('../testdir/a', ':t'))
+  call assert_equal('a', '../testdir/a'->fnamemodify(':t'))
   call assert_equal('', fnamemodify('.', ':p:t'))
   call assert_equal('test.out', fnamemodify('test.out', ':p:t'))
   call assert_equal('out', fnamemodify('test.out', ':p:e'))
diff --git a/src/testdir/test_fold.vim b/src/testdir/test_fold.vim
index 1d5259f..7aef51f 100644
--- a/src/testdir/test_fold.vim
+++ b/src/testdir/test_fold.vim
@@ -89,7 +89,7 @@
     setl fen fdm=marker
     2
     norm! >>
-    let a=map(range(1,5), 'foldclosed(v:val)')
+    let a=map(range(1,5), 'v:val->foldclosed()')
     call assert_equal([-1,-1,-1,4,4], a)
     bw!
 endfunc
@@ -133,7 +133,7 @@
   call assert_equal(0, foldlevel(3))
   call assert_equal(0, foldlevel(4))
   call assert_equal(1, foldlevel(5))
-  call assert_equal(7, foldclosedend(5))
+  call assert_equal(7, 5->foldclosedend())
 
   bwipe!
   set foldmethod&
@@ -208,7 +208,7 @@
   %foldclose
   call assert_equal(2, foldclosedend(1))
   call assert_equal(0, foldlevel(3))
-  call assert_equal(0, foldlevel(4))
+  call assert_equal(0, 4->foldlevel())
   call assert_equal(6, foldclosedend(5))
   call assert_equal(10, foldclosedend(7))
   call assert_equal(14, foldclosedend(11))
@@ -656,7 +656,7 @@
   call assert_equal(10, foldclosed(10))
   call assert_equal(11, foldclosedend(10))
   call assert_equal('+--  2 lines: Line2', foldtextresult(2))
-  call assert_equal('+--  2 lines: Line8', foldtextresult(10))
+  call assert_equal('+--  2 lines: Line8', 10->foldtextresult())
 
   set fdm& sw& fdl&
   enew!
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index 7a3d054..027700b 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -1001,7 +1001,7 @@
   call assert_equal(0, filewritable('Xfilewritable'))
 
   call assert_notequal(0, setfperm('Xfilewritable', 'rw-r-----'))
-  call assert_equal(1, filewritable('Xfilewritable'))
+  call assert_equal(1, 'Xfilewritable'->filewritable())
 
   call assert_equal(0, filewritable('doesnotexist'))
 
@@ -1012,20 +1012,21 @@
 func Test_Executable()
   if has('win32')
     call assert_equal(1, executable('notepad'))
-    call assert_equal(1, executable('notepad.exe'))
+    call assert_equal(1, 'notepad.exe'->executable())
     call assert_equal(0, executable('notepad.exe.exe'))
     call assert_equal(0, executable('shell32.dll'))
     call assert_equal(0, executable('win.ini'))
   elseif has('unix')
-    call assert_equal(1, executable('cat'))
+    call assert_equal(1, 'cat'->executable())
     call assert_equal(0, executable('nodogshere'))
 
     " get "cat" path and remove the leading /
     let catcmd = exepath('cat')[1:]
     new
+    " check that the relative path works in /
     lcd /
     call assert_equal(1, executable(catcmd))
-    call assert_equal('/' .. catcmd, exepath(catcmd))
+    call assert_equal('/' .. catcmd, catcmd->exepath())
     bwipe
   endif
 endfunc
@@ -1349,7 +1350,7 @@
   sandbox let F = {-> 'hello'}
   call assert_equal('hello', F())
 
-  sandbox let F = {-> execute("normal ix\<Esc>")}
+  sandbox let F = {-> "normal ix\<Esc>"->execute()}
   call assert_fails('call F()', 'E48:')
   unlet F
 
@@ -1380,7 +1381,7 @@
   call writefile(['func ExistingFunction()', 'echo "yes"', 'endfunc'], 'Xfuncexists')
   call assert_equal(0, exists('*ExistingFunction'))
   source Xfuncexists
-  call assert_equal(1, exists('*ExistingFunction'))
+  call assert_equal(1, '*ExistingFunction'->exists())
   " Redefining a function when reloading a script is OK.
   source Xfuncexists
   call assert_equal(1, exists('*ExistingFunction'))
@@ -1427,7 +1428,7 @@
 
   " <Esc> requires another character to avoid it being seen as the start of an
   " escape sequence.  Zero should be harmless.
-  call feedkeys("\<Esc>0", 'L')
+  eval "\<Esc>0"->feedkeys('L')
   let a = confirm('Are you sure?', "&Yes\n&No")
   call assert_equal(0, a)
 
@@ -1525,7 +1526,7 @@
   call writefile([], 'Xdir/[a-1]/foo.txt')
   call writefile([], 'Xdir/[a-1]/bar.txt')
   call assert_true(filereadable('Xdir/foo.txt'))
-  call assert_true(filereadable('Xdir/[a-1]/foo.txt'))
+  call assert_true('Xdir/[a-1]/foo.txt'->filereadable())
 
   call assert_equal(0, delete('Xdir', 'rf'))
   call assert_false(filereadable('Xdir/foo.txt'))
diff --git a/src/testdir/test_search.vim b/src/testdir/test_search.vim
index 604f3c2..7c30a1a 100644
--- a/src/testdir/test_search.vim
+++ b/src/testdir/test_search.vim
@@ -1303,7 +1303,7 @@
 
   call cursor(1, 1)
   let @/ = 'foo'
-  let pat = escape(@/, '()*?'. '\s\+')
+  let pat = @/->escape('()*?'. '\s\+')
   let g:a = execute(':unsilent :norm! n')
   call assert_match(pat, g:a)
 
diff --git a/src/testdir/test_vimscript.vim b/src/testdir/test_vimscript.vim
index dc4df44..8dc00f2 100644
--- a/src/testdir/test_vimscript.vim
+++ b/src/testdir/test_vimscript.vim
@@ -638,7 +638,7 @@
 	if v:errmsg == ""
 	    Xout "Message missing."
 	else
-	    let v:errmsg = escape(v:errmsg, '"')
+	    let v:errmsg = v:errmsg->escape('"')
 	    Xout "Unexpected message:" v:errmsg
 	endif
     endif