Android tests build error: Multiple dex files define Landroid/support/test/BuildConfig

Question

I\'m trying to add Espresso 2 to my project (which also has lots of other dependencies), but I\'m hitting this error when trying to run tests:

UNEXPECTED TOP         


        

Answer 1

I recently ran into this error after we enabled incremental gradle builds.

dexOptions {
    javaMaxHeapSize "2g"
    incremental true
}

This was resolved by disabling predexing libraries.

dexOptions {
    javaMaxHeapSize "2g"
    incremental true
    preDexLibraries = false
}