# Require in environment.rb is failing in unit test

**URL:** <https://www.ruby-forum.com/t/require-in-environment-rb-is-failing-in-unit-test/135272>\
**Category:** Rails\
**Created:** [April 20, 2008, 1:46pm UTC](https://www.ruby-forum.com/t/require-in-environment-rb-is-failing-in-unit-test/135272 "2008-04-20T13:46:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![gobi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/76d3ee/32.png) [@gobi](https://www.ruby-forum.com/u/gobi)\
**Post date:** [April 20, 2008, 1:46pm UTC](https://www.ruby-forum.com/t/require-in-environment-rb-is-failing-in-unit-test/135272/1 "2008-04-20T13:46:19Z")

</div>

When I run unit test it fails.

/home/gobi/workspace/0001\_myweb/config/environment.rb:1:in `require': no such file to load -- action_mailer (LoadError) from /home/gobi/workspace/0001_myweb/config/environment.rb:1 from ./test/unit/../test_helper.rb:2:in`require’  
from ./test/unit/…/test\_helper.rb:2  
from test/unit/user\_test.rb:1:in `require’  
from test/unit/user\_test.rb:1

But when I run rails application it is working no problem.

How can I run the Unit Test.

Could someone teach me how?