These failures are not repeatable, and had seen this happen a few times. 
The tolerance margin for this statistical test is presently set at 0.005.

I once had a test failure that read:

 java.lang.AssertionError: expected:<0.5> but was:<0.50578>

Maybe change the fuzzfactor for this test from present 0.005 to 0.006?



On Tuesday, January 28, 2014 7:00 AM, Ted Dunning <[email protected]> wrote:
 
Was this repeatable ?  

If transient then the test likely has a variable seed.  This test is 
statistical and may have too tight a tolerance. 

Sent from my iPhone


> On Jan 28, 2014, at 0:00, Andrew Musselman <[email protected]> wrote:
> 
> Got this error running tests; anyone know what causes this?
> 
> Tests run: 9, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 40.063 sec
> <<< FAILURE! - in org.apache.mahout.math.stats.TDigestTest
> testSequentialPoints(org.apache.mahout.math.stats.TDigestTest)  Time
> elapsed: 4.674 sec  <<< FAILURE!
> java.lang.AssertionError: expected:<0.5> but was:<0.49489>

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