Jacoco offline instrumentation Gradle script

问题:

I tried looking for Jacoco offline instrumentation gradle script snippets but couldn't find one. Is it possible to do Jacoco offline instrumentation through gradle scripts ? If yes...An example of it would be greats. Thanks.

回答1:

Here is an example of Gradle script that performs offline instrumentation using JaCoCo Ant Task:

apply plugin: 'java'

configurations {
  jacoco
  jacocoRuntime
}

dependencies {
  jacoco group: 'org.jacoco', name: 'org.jacoco.ant', version: '0.7.9', classifier: 'nodeps'
  jacocoRuntime group: 'org.jacoco', name: 'org.jacoco.agent', version: '0.7.9', classifier: 'runtime'
  testCompile 'junit:junit:4.12'
}

repositories {
  mavenCentral()
}

task instrument(dependsOn: ['classes']) {
  ext.outputDir = buildDir.path + '/classes-instrumented'
  doLast {
    ant.taskdef(name: 'instrument',
                classname: 'org.jacoco.ant.InstrumentTask',
                classpath: configurations.jacoco.asPath)
    ant.instrument(destdir: outputDir) {
      fileset(dir: sourceSets.main.output.classesDir)
    }
  }
}

gradle.taskGraph.whenReady { graph ->
  if (graph.hasTask(instrument)) {
    tasks.withType(Test) {
      doFirst {
        systemProperty 'jacoco-agent.destfile', buildDir.path + '/jacoco/tests.exec'
        classpath = files(instrument.outputDir) + classpath + configurations.jacocoRuntime
      }
    }
  }
}

task report(dependsOn: ['instrument', 'test']) {
  doLast {
    ant.taskdef(name: 'report',
                classname: 'org.jacoco.ant.ReportTask',
                classpath: configurations.jacoco.asPath)
    ant.report() {
      executiondata {
        ant.file(file: buildDir.path + '/jacoco/tests.exec')
      }
      structure(name: 'Example') {
         classfiles {
           fileset(dir: sourceSets.main.output.classesDir)
         }
         sourcefiles {
           fileset(dir: 'src/main/java')
         }
      }
      html(destdir: buildDir.path + '/reports/jacoco')
    }
  }
}

回答2:

The gradle jacoco plugin doesn't support offline instrumentation, it always does online instrumentation via the java agent.

If the ant jacoco plugin supports offline instrumentation that's likely the best way to get offline instrumentation working in gradle