$ ./pants options | grep 'cache.*test'

cache.test.read_from = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.write_to = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test-changed.read_from = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test-changed.write_to = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.go.read_from = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.go.write_to = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.junit.read_from = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.junit.write_to = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.node.read_from = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.node.write_to = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.pytest.read_from = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.pytest.write_to = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.pytest-prep.read_from = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.pytest-prep.write_to = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.test-jvm-prep-command.read_from = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.test-jvm-prep-command.write_to = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.test-prep-command.read_from = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)
cache.test.test-prep-command.write_to = ['/Users/stuhood/src/pants/.cache'] (from HARDCODED)