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https://issues.apache.org/jira/browse/MAHOUT-1059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13438400#comment-13438400
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Paritosh Ranjan commented on MAHOUT-1059:
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I thought Mocking was the best way to test DelegatingVector.
I also think its necessary to test DelegatingVector ( though it looks pretty
simple ), as there are lots of methods, and it would be really easy to inject
bug but would be difficult to debug it.
I personally do not believe in creating generalized classes for testing. I
think class ATest should be used to test A, BTest for B and so on. However, A
should only test A's code, B should only test B's code and so on. Generalizing
a class for writing test cases for a particular genre makes it difficult for a
new guy to find the test cases.
However, in the end, what actually matters is that the code should work, so,
all approaches are fine.
> New matrix extensions
> ---------------------
>
> Key: MAHOUT-1059
> URL: https://issues.apache.org/jira/browse/MAHOUT-1059
> Project: Mahout
> Issue Type: Improvement
> Components: Math
> Reporter: Ted Dunning
> Fix For: 0.8
>
> Attachments:
> 0001-MAHOUT-1059-Added-Centroid-WeightedVector-Delegating.patch,
> 0001-MAHOUT-1059-Added-Centroid-WeightedVector-Delegating.patch,
> 0002-MAHOUT-1059-Stylistic-cleanups.patch, DelegatingVectorTest.java
>
>
> The upcoming clustering needs several capabilities to support different
> operations. These include some matrix extensions for adding behaviors to
> different kinds of matrices. Also there is a file based matrix that uses
> mmap to access a file as if it were a matrix in shared memory. Since this is
> off-heap and shared between processes, it can seriously help some programs.
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