Need some explanations about the code coverage results

[Marc Ouédraogo]

Hello everyone, I'm writing to you for information or clarification on the results given by Jacoco. I'm a new Jacoco user and I'm lost.

I've been experimenting with Jacoco and have been able to report Branch coverage, Instruction coverage, Method coverage and Line coverage.
However, I didn't understand why Branch coverage is low, whereas Line coverage, Instruction coverage and even Method coverage are often close to 100%.

As an example, I'm sending you this image showing a summary table of the results.

I used Evosuite to generate the test cases.

BRcov = Branch Coverage

IScov = Instruction coverage

MTcov = Method coverage

LIcov = Line coverage

Best regards,

[Marc Hoffmann]

Hi Marc,

this is a common situation. Take for example the following code:

  if (x > 100) {

    print(“big”);

  }

If you test this code with x == 200 you will get 100% line and instruction coverage. But you still miss the branch where the if block is not executed.

If you drill down your coverage report to source level you see the specific lines where branches are missed.

Regards,

-marc

On 28. Jun 2023, at 10:10, Marc Ouédraogo <krycm...@gmail.com> wrote:

Hello everyone, I'm writing to you for information or clarification on the results given by Jacoco. I'm a new Jacoco user and I'm lost.

I've been experimenting with Jacoco and have been able to report Branch coverage, Instruction coverage, Method coverage and Line coverage.
However, I didn't understand why Branch coverage is low, whereas Line coverage, Instruction coverage and even Method coverage are often close to 100%.

As an example, I'm sending you this image showing a summary table of the results.

I used Evosuite to generate the test cases.

<Screenshot 2023-06-28 at 10.06.19.png>

BRcov = Branch Coverage

IScov = Instruction coverage

MTcov = Method coverage

LIcov = Line coverage

Best regards,

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<Screenshot 2023-06-28 at 10.06.19.png>

[Marc Ouédraogo]

Hello marc, 

Many thanks for your response.

It's more clear for me now!

Best regards,