CHANGED

test-platform.yml:
   tier (optional):
       demote: reduces the jobs tier by 1, if the job was already tier 3 it will not be ran.
       promote: increases the jobs tier by 1 (if the job was specified as tier 1, it won't change)

test-platforms.yml

# This file maps build platforms to test platforms.  In some cases, a
# single build may be tested on multiple test platforms, but a single test
# platform can only link to one build platform.  Both bulid and test platforms
# are represented as <platform>/<type>, where <type> is what Treeherder calls a
# collection.
#
# Each test platform further specifies the set of tests that will be scheduled
# for the platform, referring to tests defined in test-sets.yml.
#
# Note that set does not depend on the tree; tree-dependent job selection
# should be performed in the target task selection phase of task-grpah
# generation.
linux64/debug:
    build-platform: linux64/debug
    test-set: all-tests
linux64/opt:
    build-platform: linux64/opt
    test-set: all-tests
    tier: demote
linux64/pgo:
    build-platform: linux64-pgo/opt
    test-set: all-tests
    tier: demote
#mulet/opt:
#    build-platform: mulet/opt
#    test-set: mulet-tests

test-sets.yml

# Each key in this file specifies a set of tests to run.  Different test sets
# may, for example, be bound to different test platforms.
#
# Note that set does not depend on the tree; tree-dependent job selection
# should be performed in the target task selection phase of task-grpah
# generation.
#
# A test set has a name, and a list of tests that it contains.   Other test
# sets can be included with `include: ..`.  The result is treated as a set,
# with any duplicate tests discarded.
#
# Test names given here reference tests.yml.

all-tests:
    #- include: mochitests
    #- include: reftests
    #- include: web-platform-tests
    - cppunit
    - crashtest
    - crashtest-e10s
    #- external-media-tests
    #- firefox-ui-functional
    #- firefox-ui-functional-e10s
    #- gtest
    #- jittests
    #- jsreftest
    #- jsreftest-e10s
    #- marionette
    #- marionette-e10s
    #- xpcshell

mulet-tests:
    - reftest
    - mochitest
    # TODO: these only run on m-c (filter in target task set)
    - gaia-build
    - gaia-build-unit
    - gaia-js-integration
    - gaia-linter
    - gaia-unit
    - gaia-unit-oop

mochitests:
    - mochitest
    - mochitest-e10s
    - mochitest-a11y
    - mochitest-browser-chrome
    - mochitest-browser-chrome-e10s
    - mochitest-chrome
    - mochitest-devtools-chrome
    - mochitest-devtools-chrome-e10s
    - mochitest-jetpack
    - mochitest-media
    - mochitest-media-e10s
    - mochitest-webgl
    - mochitest-webgl-e10s
    - mochitest-gpu
    - mochitest-gpu-e10s
    - mochitest-clipboard
    - mochitest-clipboard-e10s

reftests:
    - reftest
    - reftest-e10s
    - reftest-no-accel
    - reftest-no-accel-e10s

web-platform-tests:
    - web-platform-tests
    - web-platform-tests-e10s
    - web-platform-tests-reftests
    - web-platform-tests-reftests-e10s