Running small or medium tests with connectedInstrumentTest task

build.gradle

buildscript {
    repositories {
        mavenCentral()
    }
}

apply plugin: 'android'

repositories {
    mavenCentral()
}

android {

    //All other configurations

    defaultConfig {
        versionCode 110
        versionName "1.1.0"
        minSdkVersion 8
        targetSdkVersion 17

        testPackageName "it.mypackage.test"
        testInstrumentationRunner getInstrumentationTestRunner();
    }
}

def getInstrumentationTestRunner() {

    def result = "android.test.InstrumentationTestRunner";

    if (project.hasProperty("testSize")) {

        switch (project.getProperties().get("testSize")) {

            case "small":
                result = "it.mypackage.test.runner.SmallTestsIntrumentationTestRunner";
                break;

            case "medium":
                result = "it.mypackage.test.runner.MediumTestsIntrumentationTestRunner";
                break
        }
    }

    logger.lifecycle("Using TestRunner: " + result)

    return result
}

MediumTestsIntrumentationTestRunner.java

package it.mypackage.test.runner;

import android.os.Bundle;
import android.test.InstrumentationTestRunner;

public class MediumTestsIntrumentationTestRunner extends InstrumentationTestRunner {

    @Override
    public void onCreate(Bundle arguments) {

        arguments.putString("size", "medium");

        super.onCreate(arguments);
    }
}

SmallTestsIntrumentationTestRunner.java

package it.mypackage.test.runner;

import android.os.Bundle;
import android.test.InstrumentationTestRunner;

public class SmallTestsIntrumentationTestRunner extends InstrumentationTestRunner {

    @Override
    public void onCreate(Bundle arguments) {

        arguments.putString("size", "small");

        super.onCreate(arguments);
    }
}

Usage

For running small tests:

`./gradlew connectedAndroidTest -PtestSize=small`

For running medium tests:

`./gradlew connectedAndroidTest -PtestSize=medium`

without the `testSize` property test will run with the default `android.test.InstrumentationTestRunner`

Thanks,helpful.

I stumbled across this and thought that it is worth mentioning that arguments can now be passed straight to the instrumentation runner. This feature has been available since version 1.3 of the android gradle plugin.

The android gradle DSL reference is here:

http://google.github.io/android-gradle-dsl/1.3/com.android.build.gradle.internal.dsl.ProductFlavor.html#com.android.build.gradle.internal.dsl.ProductFlavor:testInstrumentationRunnerArguments

You can now pass a size argument, at the CLI or by defining a function that determines the value of the argument to use.

One problem that I have found is that it is only available via the gradle plugin and cannot be done in Android Studio 1.4.1. You can't pass arguments to the instrumentation runner in the GUI. There is currently a issue raised for this, which has been re-assigned for Android Studio 1.5 (https://code.google.com/p/android/issues/detail?id=158537). Until then the approach of using custom instrumentation runners to run different size tests seems like a valid one.