cd amber
spade update
spade preview
Then visit: http://localhost:4020/tests.html?package=PACKAGE_NAME. Please 'PACKAGE_NAME' with the name of the package you want to run. For example:
Be sure you include the new package as a dependency in the global package.json and run spade update.
Note that unless you are adding new tests or adding a new package you should not need to run spade update.