"No files to pass to dex" in dexDebugTest

[Google Code Exporter]

I setup project as described in 
https://code.google.com/p/android-test-kit/wiki/EspressoSetupInstructions . But 
the proguard warning: library classes depending on program classes. I solved 
this by adding 
" afterEvaluate {
        gradle.projectsEvaluated {
            proguardDebugTest.enabled = false
        }
    }"
to skip it. Then I get this problem in dexDebugTest:"java.io.IOException: No 
files to pass to dex." Anyone knows how to solve this?

Sorry for the ugly paragraph format here. I really dont know how to make it 
look pretty without markdown support.

Original issue reported on code.google.com by [e-mail] on 26 Dec 2014 at 4:21