java.lang.NoClassDefFoundError: android.databinding.DataBinderMapperImpl when running Espresso tests

Question

Data binding setup:

apply plugin: \'kotlin-kapt\'

android {
    dataBinding {
        enabled = true
    }
}

dependencies {
    kapt \"com.android.databind         


        

Answer 1

I have the same this issue, and fixed by adding

kapt {
    generateStubs = true
}

in build.gradle app (all module if using dataBinding)

apply plugin: 'kotlin-kapt'

android {
...
    dataBinding {
        enabled = true
    }
}

kapt {
    generateStubs = true
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    ...
    implementation "androidx.core:core-ktx:+"
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    kapt "com.android.databinding:compiler:$android_plugin_version"

}

In build.gradle project

buildscript {
    ext.kotlin_version = '1.3.70'
    ext.android_plugin_version = '3.5.2'
    repositories {
        google()
        jcenter()

    }
    dependencies {
        classpath "com.android.tools.build:gradle:$android_plugin_version"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}