ember try:testall should honor all or a subset of 'ember test' arguments

ember try:testall --test-port $MY_TEST_PORT

The option '--test-port' is not registered with the try:testall command. Run `ember try:testall --help` for a list of supported options.

Background: we run multiple concurrent project tests on the same build machine, and our build system chooses a port and exposes it as an environment variable.

[kategengler]

@dexturr Your config file can have javascript in it, so you could have:

module.exports = function() {
  return {
    command:  `ember test --test-port=${process.env.BUILD_PORT}`,
    scenarios: [
     // scenarios here
    ]
  }
}

[kategengler]

Only ember try:one takes a command via the command line like that. For ember try:each the only current way to customize the command is to put it in the config https://github.com/ember-cli/ember-try#configuration-files By default, this is config/ember-try.js but both commands take an optional --config-path https://github.com/ember-cli/ember-try#ember-tryeach