import { assert_equalfile } from "https://deno.land/x/denops_std@v6.3.0/function/vim/mod.ts";
When the files {fname-one} and {fname-two} do not contain
exactly the same text an error message is added to v:errors.
Also see assert-return.
When {fname-one} or {fname-two} does not exist the error will
mention that.
Mainly useful with terminal-diff.
Can also be used as a method:
GetLog()->assert_equalfile('expected.log')