When using jib to run jtreg tests:

cd /w/jdk9/dev/test

bash \
  /w/jdk9/dev/common/bin/jib.sh \
  make \
  --data-dir /var/tmp/jib-tbell \
  --profile solaris-x64 -- \
  JT_JAVA=/w/java/jdk1.8.0 \
  TEST_OUTPUT_DIR=/w/jdk9/dev/build/solaris-x64/testoutput \
  PRODUCT_HOME=/w/jdk9/dev/build/solaris-x64/jdk \
  TEST_IMAGE_DIR=/w/jdk9/dev/build/solaris-x64/testBundle \
  TESTDIRS=../nashorn/test \
  TEST_SELECTION=:tier2 \
  EXTRA_JTREG_OPTIONS='-k:!headful -xml:verify' \
  CONCURRENCY=8 \
  JTREG_TIMEOUT_OPTION=-timeoutFactor:5 \
  jtreg_tests

TEST_IMAGE_DIR is set by jib.

For those subtrees that do not have any native tests (such as nashorn), TEST_IMAGE_DIR should not be considered:

Error: The -nativepath path does not exist: /w/jdk9/dev/build/solaris-
x64/testBundle/nashorn/jtreg/native