Collecting Executed Statements for Specific Test Method with JaCoCo

[m1k0]

Dear Team,

I hope this message finds you well. I am a newcomer to both Java and JaCoCo, and I am currently looking to collect information on all executed statements within a Java library when running a specific test method. I would like to know if it is possible to achieve this by modifying JaCoCo.

From my research, it seems that JaCoCo might not be able to target specific test methods directly. I ran the entire test class 'TestClass', using the following command:

java -javaagent:/workspace/jacocoagent.jar=destfile=/workspace/jacoco.exec -cp /workspace/project-sourceCode.jar:/workspace/build-tests/:/workspace/junit.jar junit.textui.TestRunner TestClass

However, this still does not meet my exact needs. I am concerned that inserting probes for every statement in the entire project would result in an excessively large array. I am unsure whether JaCoCo can be further customized to fulfill my requirements.

I would greatly appreciate any guidance or suggestions you could offer.

Thank you very much for your time and assistance.

[Marc Hoffmann]

Hi,

not sure whether I understand you question correctly.

I am concerned that inserting probes for every statement in the entire project would result in an excessively large array.

This is the core functionality of JaCoCo. We do actually not insert probes after every instruction. Instead we insert a few probes at strategic position into the control flow so that we can infer the execution status of every instruction and branch at analysis time. You can read about this here: https://www.jacoco.org/jacoco/trunk/doc/flow.html

JaCoCo is actually used by very large projects since many years.

Regards,

-marc

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[m1k0]

Thank you very much for your response. Your reply has been very helpful to me. Additionally, I have another question. Since my goal is to collect information on executed statements, I believe that I can further analyze the execution of the control flow graph to determine which statements are executed when running specific test methods. Does JaCoCo have an API that allows access to the execution details of the control flow graph? Thanks!!!