--- a/taskcluster/ci/source-check/python-tests.yml
+++ b/taskcluster/ci/source-check/python-tests.yml
@@ -1,12 +1,12 @@
 taskgraph-tests/opt:
     description: taskcluster/taskgraph unit tests
     treeherder:
-        symbol: tg
+        symbol: py(tg)
         kind: test
         tier: 2
         platform: linux64/opt
     worker-type: aws-provisioner-v1/b2gtest
     worker:
         implementation: docker-worker
         docker-image: {in-tree: "lint"}
         max-run-time: 1800
@@ -17,20 +17,49 @@ taskgraph-tests/opt:
         - integration
         - release
     when:
         files-changed:
             - 'taskcluster/**/*.py'
             - 'config/mozunit.py'
             - 'python/mach/**/*.py'
 
+mozbase/opt:
+    description: testing/mozbase unit tests
+    platforms:
+        - linux64/opt
+    treeherder:
+        symbol: py(mb)
+        kind: test
+        tier: 2
+    worker-type:
+        by-platform:
+            linux64.*: aws-provisioner-v1/b2gtest
+    worker:
+        by-platform:
+            linux64.*:
+                implementation: docker-worker
+                docker-image: {in-tree: "lint"}
+                max-run-time: 3600
+    run:
+        using: mach
+        mach: python-test --subsuite mozbase
+    run-on-projects:
+        - integration
+        - release
+    when:
+        files-changed:
+            - 'testing/mozbase/**'
+            - 'config/mozunit.py'
+            - 'python/mach_commands.py'
+
 mozharness/opt:
     description: mozharness integration tests
     treeherder:
-        symbol: MH
+        symbol: py(MH)
         kind: test
         tier: 2
         platform: lint/opt
     worker-type: aws-provisioner-v1/b2gtest
     worker:
         implementation: docker-worker
         docker-image: {in-tree: "lint"}
         max-run-time: 1800

--- a/taskcluster/taskgraph/transforms/task.py
+++ b/taskcluster/taskgraph/transforms/task.py
@@ -340,16 +340,17 @@ task_description_schema = Schema({
         # This task only needs to be run if a file matching one of the given
         # patterns has changed in the push.  The patterns use the mozpack
         # match function (python/mozbuild/mozpack/path.py).
         Optional('files-changed'): [basestring],
     }),
 })
 
 GROUP_NAMES = {
+    'py': 'Python unit tests',
     'tc': 'Executed by TaskCluster',
     'tc-e10s': 'Executed by TaskCluster with e10s',
     'tc-Fxfn-l': 'Firefox functional tests (local) executed by TaskCluster',
     'tc-Fxfn-l-e10s': 'Firefox functional tests (local) executed by TaskCluster with e10s',
     'tc-Fxfn-r': 'Firefox functional tests (remote) executed by TaskCluster',
     'tc-Fxfn-r-e10s': 'Firefox functional tests (remote) executed by TaskCluster with e10s',
     'tc-M': 'Mochitests executed by TaskCluster',
     'tc-M-e10s': 'Mochitests executed by TaskCluster with e10s',