[ruby/error_highlight] Add a test to check if it is robust against a spoofed filename

Previously, RubyVM::AST.of opened a wrong file if the iseq's file path is spoofed.

```
module Dummy
  binding.irb
end
```

```
$ ruby test.rb

From: test.rb @ line 2 :

    1: module Dummy
 => 2:   binding.irb
    3: end

irb(Dummy):001:0> foo
/home/mame/work/ruby/local/lib/ruby/3.1.0/error_highlight/base.rb:412:in `spot_colon2': undefined method `last_lineno' for nil:NilClass (NoMethodError)

      if nd_parent.last_lineno == @node.last_lineno
                  ^^^^^^^^^^^^
```

Found by @kateinoigakukun

This issue is already fixed in the interpreter side.
This change just adds a test for the case.

https://github.com/ruby/error_highlight/commit/f3626b9032

0 files changed, 0 insertions, 0 deletions