# Test passes when run isolated, fails when run using "rake test"

**URL:** <https://www.ruby-forum.com/t/test-passes-when-run-isolated-fails-when-run-using-rake-test/131857>\
**Category:** Rails\
**Created:** [March 13, 2008, 10:06pm UTC](https://www.ruby-forum.com/t/test-passes-when-run-isolated-fails-when-run-using-rake-test/131857 "2008-03-13T22:06:56Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![g0nzo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/3bc359/32.png) [@g0nzo](https://www.ruby-forum.com/u/g0nzo)\
**Post date:** [March 13, 2008, 10:06pm UTC](https://www.ruby-forum.com/t/test-passes-when-run-isolated-fails-when-run-using-rake-test/131857/1 "2008-03-13T22:06:56Z")

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Hi,

I got very simple unit test (creates new object and checks if it’s  
successfuly saved) that passes when I run only the file, which  
contains this test, but fails when I run “rake test”.

Any ideas what can be wrong?

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<div class="post-metadata">

**Author:** ![g0nzo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/3bc359/32.png) [@g0nzo](https://www.ruby-forum.com/u/g0nzo)\
**Post date:** [March 13, 2008, 10:35pm UTC](https://www.ruby-forum.com/t/test-passes-when-run-isolated-fails-when-run-using-rake-test/131857/2 "2008-03-13T22:35:12Z")

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On 13 Mar 2008, at 21:06, szimek wrote:

> Hi,
> 
> I got very simple unit test (creates new object and checks if it’s  
> successfuly saved) that passes when I run only the file, which  
> contains this test, but fails when I run “rake test”.

Tests tend to assume that each individual test is isolated from  
subsequent ones. If this isn’t the case then you can see things  
similar to what you describe.  
A common one is having transactional fixtures turned on but the  
database not supporting transactions (if you’re using mysql and it has  
defaulted to myisam tables) and things like that.

Fred

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<div class="post-metadata">

**Author:** ![g0nzo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/3bc359/32.png) [@g0nzo](https://www.ruby-forum.com/u/g0nzo)\
**Post date:** [March 13, 2008, 11:28pm UTC](https://www.ruby-forum.com/t/test-passes-when-run-isolated-fails-when-run-using-rake-test/131857/3 "2008-03-13T23:28:33Z")

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On 13 Mar, 22:34, Frederick C. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> Tests tend to assume that each individual test is isolated from
> 
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> smime.p7s  
> 5KPobierz

Thanks! That was it.