diff --git a/runtime/syntax/testdir/input/vim.vim b/runtime/syntax/testdir/input/vim_keymap.vim
similarity index 100%
rename from runtime/syntax/testdir/input/vim.vim
rename to runtime/syntax/testdir/input/vim_keymap.vim
diff --git a/runtime/syntax/testdir/input/vim_variables.vim b/runtime/syntax/testdir/input/vim_variables.vim
new file mode 100644
index 0000000..93ad6d9
--- /dev/null
+++ b/runtime/syntax/testdir/input/vim_variables.vim
@@ -0,0 +1,11 @@
+" Vim variable highlighting
+
+let foo = expr
+
+let foo += expr
+let foo -= expr
+let foo *= expr
+let foo /= expr
+let foo %= expr
+let foo .= expr
+let foo ..= expr