Robolectric with Gradle: Resources not found

Question

I'm trying to run my Robolectric tests together with the new Gradle Android build system, but I'm stuck at accessing the resources of my main project.

I split the build into two separate projects to avoid conflicts between the java and the android gradle plugins, so the directory structure looks roughly like this:

.
├── build.gradle
├── settings.gradle
├── mainproject
│   ├── build
│   │   ├── classes
│   │   │   └── debug
│   ├── build.gradle
│   └── src
│       └── main
│           ├── AndroidManifest.xml
│           └── ...
└── test
    ├── build.gradle
    └── src
        └── test
            └── java
                └── ...
                    └── test
                        ├── MainActivityTest.java
                        ├── Runner.java
                        ├── ServerTestCase.java
                        └── StatusFetcherTest.java

My build.gradle in test/ currently looks like this:

buildscript {
    repositories {
        mavenCentral()
    }

    dependencies {
        classpath 'com.stanfy.android:gradle-plugin-java-robolectric:2.0'
    }
}

apply plugin: 'java-robolectric'

repositories {...}

javarob {
    packageName = 'com.example.mainproject'
}

test {
    dependsOn ':mainproject:build'
    scanForTestClasses = false
    include "**/*Test.class"
    // Oh, the humanity!
    def srcDir = project(':mainproject').android.sourceSets.main.java.srcDirs.toArray()[0].getAbsolutePath()
    workingDir srcDir.substring(0, srcDir.lastIndexOf('/'))
}

project(':mainproject').android.sourceSets.main.java.srcDirs.each {dir ->
    def buildDir = dir.getAbsolutePath().split('/')
    buildDir =  (buildDir[0..(buildDir.length - 4)] + ['build', 'classes', 'debug']).join('/')

    sourceSets.test.compileClasspath += files(buildDir)
    sourceSets.test.runtimeClasspath += files(buildDir)
}

dependencies {    
    testCompile group: 'com.google.android', name: 'android', version: '4.1.1.4'
    testCompile group: 'org.robolectric', name: 'robolectric', version: '2.0-alpha-3'
    ...
}

The evil classpath hackery allows me to access all classes of my main project, except for R , which exists as .class file in the build directory, but raises this error during the compileTestJava task:

/.../MainActivityTest.java:16: error: cannot find symbol
                final String appName = activity.getResources().getString(R.string.app_name);
                                                                          ^
  symbol:   variable string
  location: class R
1 error
:test:compileTestJava FAILED

There must be a better way to execute Robolectric tests with the new build system, right?

( Full source of the app )

Answer 1

I was running across this same issue and this is what I came up with. Instead of creating a separate project for the tests, I created a source set for the Robolectric tests and added a new task that "check" would depend on. Using some of the code from your question, here are the relevant bits of the (working) build file:

apply plugin: 'android'

sourceSets {
    testLocal {
        java.srcDir file('src/test/java')
        resources.srcDir file('src/test/resources')
    }
}

dependencies {
    compile 'org.roboguice:roboguice:2.0'
    compile 'com.google.android:support-v4:r6'

    testLocalCompile 'junit:junit:4.8.2'
    testLocalCompile 'org.robolectric:robolectric:2.1'
    testLocalCompile 'com.google.android:android:4.0.1.2'
    testLocalCompile 'com.google.android:support-v4:r6'
    testLocalCompile 'org.roboguice:roboguice:2.0'
}

task localTest(type: Test, dependsOn: assemble) {
    testClassesDir = sourceSets.testLocal.output.classesDir

    android.sourceSets.main.java.srcDirs.each { dir ->
        def buildDir = dir.getAbsolutePath().split('/')
        buildDir =  (buildDir[0..(buildDir.length - 4)] + ['build', 'classes', 'debug']).join('/')

        sourceSets.testLocal.compileClasspath += files(buildDir)
        sourceSets.testLocal.runtimeClasspath += files(buildDir)
    }

    classpath = sourceSets.testLocal.runtimeClasspath
}

check.dependsOn localTest

I've included my dependencies block to point out that in order for me to get this up and going, I had to repeat all of my compile dependencies in my custom testLocal source set.

Running gradle testLocal builds and runs just the tests inside of src/test/java , while running gradle check runs these tests in addition to those in the default android instrumentTest source set.

Hope this helps!

Answer 2

Update: Jake Wharton just announced the gradle-android-test-plugin . You can find it at https://github.com/square/gradle-android-test-plugin

It seems to be pretty streamlined, especially if you plan to use robolectric .

---

Old Answer Below

The robolectric-plugin looks promising.

The sample build.gradle file they provide is :

buildscript {
    repositories {
        mavenCentral()
        maven {
            url "https://oss.sonatype.org/content/repositories/snapshots"
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.4.2'
        classpath 'com.novoda.gradle:robolectric-plugin:0.0.1-SNAPSHOT'
    }
}

apply plugin: 'android'
apply plugin: 'robolectric'

repositories {
    mavenCentral()
    mavenLocal()
    maven {
        url "https://oss.sonatype.org/content/repositories/snapshots"
    }
}

dependencies {
    //compile files('libs/android-support-v4.jar')

    // had to deploy to sonatype to get AAR to work
    compile 'com.novoda:actionbarsherlock:4.3.2-SNAPSHOT'

    robolectricCompile 'org.robolectric:robolectric:2.0'
    robolectricCompile group: 'junit', name: 'junit', version: '4.+'
}

android {
    compileSdkVersion 17
    buildToolsVersion "17.0.0"

    defaultConfig {
        minSdkVersion 7
        targetSdkVersion 17
    }
}

It doesn't seem to work with the Android Gradle plugin version 0.5 but maybe it will soon.