offlins-gradle-plugin

Offlins is similar to standard Gradle JaCoCo plugin but uses JaCoCo tool in offline instrumentation mode. This plugin is useful if PowerMock is used in tests.

Compatibility

Compatibility table:

Offlins plugin	Gradle
0.3.0	6.1 - 8.+
0.2.1.+	5.1 - 7.6.+

Installation

The plugin is published to Gradle plugins.

Groovy

plugins {
    id "io.github.surpsg.offlins" version "0.3.0"
}

Kotlin

plugins {
    id("io.github.surpsg.offlins") version "0.3.0"
}

Configuration

All properties are optional but have the following defaults:

• JaCoCo version 0.8.8
• HTML report is enabled with dafault path build/reports/jacoco/html
• XML report is disabled with dafault path build/reports/jacoco/coverageReport.xml
• CSV report is disabled with dafault path build/reports/jacoco/coverageReport.csv

Groovy

offlinsCoverage {
    jacocoVersion = '0.8.7' // Optional. By default `0.8.8`

    reports {
        html.enabled.set true // Optional. By default `true`
        html.location.set project.file('build/custom/html') // Optional. By default `build/reports/jacoco/html`

        xml.enabled.set true // Optional. By default `false`
        xml.location.set project.file('build/custom/xmlCoverage.xml')
        // Optional. By default `build/reports/jacoco/coverageReport.xml`

        csv.enabled.set true // Optional. By default `false`
        csv.location.set project.file('build/custom/csvCoverage.csv')
        // Optional. By default `build/reports/jacoco/coverageReport.csv`    
    }
}

Kotlin

configure<io.github.surpsg.offlins.OfflinsExtension> {
    jacocoVersion = "0.8.7" // Optional. By default `0.8.8`

    reports {
        html.enabled.set(true) // Optional. By default `true`
        html.location.set(project.file("build/custom/html")) // Optional. By default `build/reports/jacoco/html`

        xml.enabled.set(true) // Optional. By default `false`
        xml.location.set(project.file("build/custom/xmlCoverage.xml")) // Optional. By default `build/reports/jacoco/coverageReport.xml`

        csv.enabled.set(true) // Optional. By default `false`
        csv.location.set(project.file("build/custom/csvCoverage.csv")) // Optional. By default `build/reports/jacoco/coverageReport.csv`    
    }
}

Excecute

Run tests by task test and generate reports by taks coverageReport:

 ./gradlew test coverageReport

Tasks description

• instrumentClassesOffline - instruments .class files
  • Inputs: class files generated by classes task
  • Outputs: instrumented classes in build/classes-instrumented
  • Depends on classes task
• assembleInstrumentedJar - generates jar file from instrumented classes
  • Inputs: insrumented class files generated by instrumentClassesOffline task
  • Outputs: jar file classes in libs/<project-name>-instrumented.jar
  • Depends on instrumentClassesOffline task
• coverageReport - generates coverage reports
  • Inputs: .exec file generated by test task
  • Outputs: HTML, XML, CSV reports(depends on plugin configuration)

Offlins plugin modifies default test task from Java plugin:

• Sets the test task to dependend on instrumentClassesOffline
• Adds org.jacoco:org.jacoco.agent artifact to classpath
• Replaces a project .class files with instrumented classes in classpath
• Replaces jars(dependecies on subprojects) with instrumented jars in classpath