# Re: undefined method \`add\_assertion' for nil:NilClass

**URL:** <https://www.ruby-forum.com/t/re-undefined-method-add-assertion-for-nil-nilclass/55798>\
**Category:** Ruby\
**Created:** [March 23, 2006, 10:15pm UTC](https://www.ruby-forum.com/t/re-undefined-method-add-assertion-for-nil-nilclass/55798 "2006-03-23T22:15:40Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![PaatschS\_Bernd](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/fbc32d/32.png) [@PaatschS\_Bernd](https://www.ruby-forum.com/u/PaatschS_Bernd)\
**Post date:** [March 23, 2006, 10:15pm UTC](https://www.ruby-forum.com/t/re-undefined-method-add-assertion-for-nil-nilclass/55798/1 "2006-03-23T22:15:40Z")

</div>

I found my problem.

I added following two lines to my code in my include section, which is  
at  
the begin of my main program:

```
require 'test/unit/assertions'
include Test::Unit::Assertions

```

This solved all my assert problems in my code.

Bernd