diff --git a/src/testdir/test_exists.vim b/src/testdir/test_exists.vim
index 471c778..62c6619 100644
--- a/src/testdir/test_exists.vim
+++ b/src/testdir/test_exists.vim
@@ -68,6 +68,10 @@
   " Existing environment variable
   let $EDITOR_NAME = 'Vim Editor'
   call assert_equal(1, exists('$EDITOR_NAME'))
+  if has('unix')
+    " ${name} environment variables are supported only on Unix-like systems
+    call assert_equal(1, exists('${VIM}'))
+  endif
   " Non-existing environment variable
   call assert_equal(0, exists('$NON_ENV_VAR'))
 
@@ -323,3 +327,5 @@
 func Test_exists_funcarg()
   call FuncArg_Tests("arg1", "arg2")
 endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab