When building mopub sdk, cannot find symbol: class org.fest.assertions.api.ANDROID

Question

I am building Mopub SDK as a module using Intellij Idea. I have copied test-assert-core-2.0M10.jar to libs folder under Mopub. However, when building it, the line import org.fest.assertions.api.ANDROID; shows red color at the word " ANDROID ". Compilation error message says:

Error:(20, 31) java: cannot find symbol
  symbol:   class ANDROID
  location: package org.fest.assertions.api

Have searched, but found nothing about this particular error. Anybody using Mopub under Intellij Idea can offer some hint? Thanks!

Answer 1

I've found the solution. I deleted all files under /mopub-sdk/src/test, and it builds successfully.