In a multi module project, when I write testcases which use classes from other 
module, somehow gradle plugin generates `jacoco.exec` in app directory. 
And in `app/build/jacoco/testDebugUnitTest.exec` also exists.

I have found a temporary workaround. Just specify the system property:
    testOptions {
        unitTests {
            all {
                systemProperty 'jacoco-agent.destfile', buildDir.path + 
'/jacoco/tests.exec'
            }
        }
    } 

or add a file jacoco-agent.properties file with 
destfile=build/jacoco/tests.exec content in the library project under 
debug/resources/ folder. 

My reproducible project: https://github.com/DenysShovhenia/Test
Steps to reproduce:
- Open project in Android Studio
- Run testDebugUnitTest task of Test(root) module
- Note the newly created jacoco.exec file in the root folder of app module

Gradle version: 4.1.0
Android Plugin Version: 3.0.1
Module Compile Sdk Version: 26


Also, I have found a similar open issue here: 
https://issuetracker.google.com/issues/67872367

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