TestTask should include the main compile target in its dependencies, even when using non standard directories (e.g., 'src/java' instead of 'src/main/java').
For instance, I have a project with java sources in 'src/java' and its junit tests in 'src/test'. The buildfile is roughly like this:
define 'my-project' do
'buildr clean test' fails on test compilation because the main compile target (i.e., 'target/classes') is not in the TestTask's dependencies. The problem is that
1. the main CompileTask tries to set its target directory during the 'before_define' phase, which is too early because it is before the "compile _('src/java')" line.
2. the TestTask does not add the main compile target during the 'after_define' phase, because the main CompileTask still has no target at that time.