Stub value of Build.VERSION.SDK_INT in Local Unit Test

问题

I am wondering if there is anyway to stub the value of Build.Version.SDK_INT? Suppose I have the following lines in the ClassUnderTest:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
    //do work
}else{
    //do another work
}

How can I cover all the code ?

I mean I want to run two tests with different SDK_INT to enter both blocks.

Is it possible in android local unit tests using Mockito/PowerMockito?

Thanks

回答1:

Change the value using reflection.

 static void setFinalStatic(Field field, Object newValue) throws Exception {
    field.setAccessible(true);

    Field modifiersField = Field.class.getDeclaredField("modifiers");
    modifiersField.setAccessible(true);
    modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);

    field.set(null, newValue);
 }

And then

 setFinalStatic(Build.VERSION.class.getField("SDK_INT"), 123);

It is tested. Works.

回答2:

As an alternative to reflection, you can use your own class that checks for API and then use Mockito to test the API-Dependent logic in fast JVM unit tests.

Example class

import android.os.Build

class SdkChecker {

    fun deviceIsOreoOrAbove(): Boolean = Build.VERSION.SDK_INT >= Build.VERSION_CODES.O

}

Example tested method

fun createNotificationChannel(notificationManager: NotificationManager) {
    if (sdkChecker.deviceIsOreoOrAbove()) { // This sdkChecker will be mocked
        // If you target Android 8.0 (API level 26) you need a channel
        notificationManager.createNotificationChannel()
    }
}

Example unit tests

import com.nhaarman.mockito_kotlin.mock
import com.nhaarman.mockito_kotlin.verify
import com.nhaarman.mockito_kotlin.verifyZeroInteractions
import com.nhaarman.mockito_kotlin.whenever

@Test
fun createNotificationChannelOnOreoOrAbove() {
    whenever(mockSdkChecker.deviceIsOreoOrAbove()).thenReturn(true)

    testedClass.createNotificationChannel(mockNotificationManager)

    verify(mockNotificationManager).createNotificationChannel()
}

@Test
fun createNotificationChannelBelowOreo() {
    whenever(mockSdkChecker.deviceIsOreoOrAbove()).thenReturn(false)

    testedClass.createNotificationChannel(mockNotificationManager)

    verifyZeroInteractions(mockNotificationManager)
}

来源：https://stackoverflow.com/questions/38074224/stub-value-of-build-version-sdk-int-in-local-unit-test

标签

android

unit-testing

mockito

powermock