How to solve duplication error when loading both espresso web and core in build.gradle?

Question

I'm trying to use Android Espresso Web for my automation test.

After adding it to the build.gradle file like shown below, I get a "DuplicateFileException" exception.

According to the API, both of the dependancies should be present in the build.gradle file so I don't understand why I get a duplication exception and how to solve it.

Error:Execution failed for task ':CompanyAAA:transformResourcesWithMergeJavaResForStagingDebugAndroidTest'.
> com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/maven/com.google.guava/guava/pom.properties
     File1: /Users/mayabechler-speicher/CompanyAAA-Android/CompanyAAA/build/intermediates/exploded-aar/com.android.support.test.espresso/espresso-web/2.2.2/jars/classes.jar
     File2: /Users/mayabechler-speicher/CompanyAAA-Android/CompanyAAA/build/intermediates/exploded-aar/com.android.support.test.espresso/espresso-core/2.2.2/jars/classes.jar

[4:24]  
// Espresso core
   androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'

   // Espresso web
   androidTestCompile 'com.android.support.test.espresso:espresso-web:2.2.2'

Any idea how to solve this error?

Possible duplicate of [Espresso-web import causes duplicateFileException](http://stackoverflow.com/questions/33800924/espresso-web-import-causes-duplicatefileexception) — R. Zagórski, Sep 15 '16 at 13:53

score 0 · Accepted Answer · edited Jun 20 '20 at 09:12

According to Google's Android Testing Support Library Examples, you don't need to declare both, if your existing app depends on webviews.

Check this configuration:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion rootProject.buildToolsVersion
    defaultConfig {
        applicationId "com.example.android.testing.espresso.web.BasicSample"
        minSdkVersion 10
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    lintOptions {
        abortOnError false
    }
    productFlavors {
    }
    packagingOptions {
      exclude 'META-INF/maven/com.google.guava/guava/pom.properties'
      exclude 'META-INF/maven/com.google.guava/guava/pom.xml'
    }
}

dependencies {
    // App dependencies
    compile 'com.android.support:support-annotations:' + rootProject.supportLibVersion;
    compile 'com.google.guava:guava:18.0'
    // Testing-only dependencies
    // Force usage of support annotations in the test app, since it is internally used by the runner module.
    androidTestCompile 'com.android.support:support-annotations:' + rootProject.supportLibVersion;
    androidTestCompile 'com.android.support.test:runner:' + rootProject.runnerVersion;
    androidTestCompile 'com.android.support.test:rules:' + rootProject.rulesVersion;
    androidTestCompile 'com.android.support.test.espresso:espresso-web:' + rootProject.espressoVersion;
}

From: https://github.com/googlesamples/android-testing/blob/master/ui/espresso/WebBasicSample/app/build.gradle

If you need both, open your build.gradle file and add:

packagingOptions {
    exclude 'META-INF/maven/com.google.guava/guava/pom.properties'
    exclude 'META-INF/maven/com.google.guava/guava/pom.xml'
}

It should work

How to solve duplication error when loading both espresso web and core in build.gradle?

1 Answers1