Androidjunit4 And Parameterized Tests

Google provide new classes to write tests for Android, and especially using jUnit 4: https://developer.android.com/tools/testing-support-library/index.html I was wondering if it is

Solution 1:

The current accepted answer doesn't provide an explanation, and the linked example isn't great at showing what needs to be done. Here's a more complete explanation that will hopefully save someone from spending the time I did figuring this out.

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While the documentation doesn't make this super obvious, it's actually surprisingly easy to set up! You are able to use another runner with instrumented Android tests as long as you set testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" in your module build.gradle file. If that is set, you do not need to explicitly set @RunWith(AndroidJUnit4.class)in your instrumented tests.

A minimal example would look like this:

build.gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"

    defaultConfig {
        minSdkVersion 19
        targetSdkVersion 26

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
}

SampleParameterizedTest.java:

@RunWith(Parameterized.class)
publicclassSampleParameterizedTest {

    @Parameter(value = 0)
    public int mTestInteger;

    @Parameter(value = 1)
    publicString mTestString;

    @ParameterspublicstaticCollection<Object[]> initParameters() {
        returnArrays.asList(newObject[][] { { 0, "0" }, { 1, "1" } });
    }

    @Testpublicvoidsample_parseValue() {
        assertEquals(Integer.parseInt(mTestString), mTestInteger);
    }
}

If you also have the need to run some tests individually and others parameterized in the same test class, see this answer on using the Enclosed runner: https://stackoverflow.com/a/35057629/1428743