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https://issues.apache.org/jira/browse/NIFI-34?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14597936#comment-14597936
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Mark Payne commented on NIFI-34:
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I would actually argue that these are both okay. No reason that we need to 
build the objects ahead of time and return immutable objects. Some may consider 
that a best practice, but I usually construct a new List/Set each time, because 
I believe the code is cleaner and easier to understand. It's also fairly common 
to write a processor where one or both of these are dynamic.

> Mock Framework should provide option to detect common bad practices/bugs
> ------------------------------------------------------------------------
>
>                 Key: NIFI-34
>                 URL: https://issues.apache.org/jira/browse/NIFI-34
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Core Framework
>            Reporter: Mark Payne
>            Priority: Minor
>
> Mock Framework should detect common errors such as:
> * Processor has member variable that is a PropertyDescriptor, but the 
> PropertyDescriptor isn't returned in the list of supported property 
> descriptors.
> * Processor has member variable that is a Relationship, but the Relationship 
> isn't returned in the Set of Relationships.
> * Processor has multiple properties or relationships as member variables with 
> the same name.
> * No META-INF/services file
> * META-INF/services file doesn't contain the Component's Fully Qualified 
> Class Name
> * No @CapabilityDescription annotation
> * No @Tags annotation
> Mock Framework should automatically detect these things and fail the unit 
> test unless checking is disabled. This requires building an object that 
> allows developer to enable/disable each of these checks.



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