patch 8.2.1804: resolve('/') returns an empty string
Problem: resolve('/') returns an empty string.
Solution: Don't remove single slash. (closes #7074)
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index 45b997f..b816125 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -339,6 +339,8 @@
call assert_equal('Xlink2', resolve('Xlink1'))
call assert_equal('./Xlink2', resolve('./Xlink1'))
call delete('Xlink1')
+
+ call assert_equal('/', resolve('/'))
endfunc
func s:normalize_fname(fname)