This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
"Test Driven" uses JUnit 4. Not the very latest version of course, but that only matters for advanced features. The absolute latest hasn't been published yet. "JUnit in Action" second edition is likely more recent. It prints in April and is available for PDF purchase now. Of course, it won't be the latest once it prints.