thufir@mordor:~/java/hello_gradle$ 
thufir@mordor:~/java/hello_gradle$ gradle build 
:compileJava
/home/thufir/java/hello_gradle/src/main/java/hello/HelloWorld.java:8: error: cannot find symbol
  @Test public void testHello() {
   ^
  symbol:   class Test
  location: class HelloWorld
/home/thufir/java/hello_gradle/src/main/java/hello/HelloWorld.java:10: error: cannot find symbol
        Assert.assertEquals(12, message.length());
        ^
  symbol:   variable Assert
  location: class HelloWorld
2 errors
:compileJava FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 4.561 secs
thufir@mordor:~/java/hello_gradle$