Configure Jacoco with gradle and kotlin DSL

Question

I'm trying to configure Jacoco to exclude some classes from analysis but can't find any working example :(

I found some samples with afterEvaluate but no success

Answer 1

src/main/java/org/example/A.java:

package org.example;

class A {
}

src/main/java/org/example/B.java:

package org.example;

class B {
}

src/test/java/org/example/ExampleTest.java:

package org.example;

public class ExampleTest {
  @org.junit.Test
  public void test() {
    new A();
    new B();
  }
}

build.gradle.kts:

plugins {
  java
  jacoco
}

repositories {
  mavenCentral()
}

dependencies {
  testCompile("junit:junit:4.12")
}

using Gradle 5.4.1 execution of gradle test jacocoTestReport produces following report

after addition to build.gradle.kts

tasks.withType<JacocoReport> {
  classDirectories.setFrom(
    sourceSets.main.get().output.asFileTree.matching {
      exclude("org/example/B.class")
    }
  )
}

execution of the same command produces following report