Clover reports vary significantly from week to week in total measured coverage

I am using Clover to gather coverage data for test cases that run on our product code that is installed as a part of WebSphere Application Server (WAS). Some of these tests are true unit tests (and call the code being tested directly), but most make EJB calls into WAS to invoke product functions that require the server to be running. In general, this seems to work well (and in fact, it was this ability to handle multiple JVMs running the same instrumented code that drew me to Clover).

In order to handle the large quantity of code, we have broken up the coverage tracking into many pieces. Some are small (100-1000 elements, as reported by Clover)), while others are very large (around 450K elements). We are running a coverage build and test cycle once per week (occasionally sooner), and we save the reports so that we can observe trend data.

The problem is that we are seeing wide fluctuations in the coverage numbers reported from week to week. For example, we had one component that went from

%age classes Elements covered Total elements

5.3% 797 2,356 44,679


42% 797 18,768 44,695

while a different component went from

5.2% 115 522 9,981


35.9% 115 3,586 9,980

in the span of 5 days. The same tests were all run in both cases (we have the evidence on our CI server that shows the tests run were the same in both cases), and as you can see from the total number of elements, there were minimal code changes between the two.

In another case, we have a component where Clover report generation says that no coverage recordings could be found, but we can clearly see coverage recordings right next to the clover.db file.

How can we get the reports to be more predictable?

1 answer

1 accepted

1 votes

This is related with a bug which occurs when IBM JRE is used. Clover is unable to find all coverage snapshot files. Bug is reported in and will be fixed in the Clover 3.1.8 version.

Clover 3.1.8 was released on 13 Nov 2012.

Suggest an answer

Log in or Join to answer
Community showcase
Teodora [Botron]
Published Thursday in Marketplace Apps

Jira Inferno: The Nine Circles of Jira Administration Hell

If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...

246 views 0 11
Read article

Atlassian User Groups

Connect with like-minded Atlassian users at free events near you!

Find a group

Connect with like-minded Atlassian users at free events near you!

Find my local user group

Unfortunately there are no AUG chapters near you at the moment.

Start an AUG

You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs

Groups near you
Atlassian Team Tour

Join us on the Team Tour

We're bringing product updates and pro tips on teamwork to ten cities around the world.

Save your spot