NullPointer Exception when using Espresso

Question

I\'m trying to use Espresso. But I got this error and I have no if I\'m missing some codes.

any thoughts will be highly appreciated.

error log:

Answer 1

To clarify the instructions on https://code.google.com/p/android-test-kit/wiki/Espresso#Espresso_Setup_Instructions, referenced by @ValeraZakharov

When using Android Studio and gradle, there is no need to update AndroidManifest.xml, instead the file build.gradle needs to be edited. Add this entry to the section android - defaultConfig:

android {
    defaultConfig {
        testInstrumentationRunner "com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner"
    }
}

Also: Right-click "add as a library" has been removed from Android studio, and replaced with:

android {
    sourceSets {
        // Espresso instrumentation tests
        androidTest.setRoot('src/instrumentTest')
    }
}

The complete section android looks like this in my project:

android {
    compileSdkVersion 17
    buildToolsVersion "19.0.1"

    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 16
        versionName getCommitNumber()
        testInstrumentationRunner "com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner"
    }

    sourceSets {
        // Espresso instrumentation tests
        androidTest.setRoot('src/instrumentTest')
    }

    packagingOptions {
        // Multiple LICENSE.txt in hamcrest packages.
        exclude 'LICENSE.txt'
    }

}