Add tox jobs

This change adds tox jobs that lint and test python code.
Together with the job definition and configuration, this
change adds some dummy directories and tests that should
be replaced once the actual code for this repo is migrated.

Change-Id: Iaa201562faf2dbee0647b3366d6d0c5ece0561d0

test-requirements.txt

@@ -0,0 +1,2 @@
+pytest
+flake8

tests/test_dummy.py

@@ -0,0 +1,2 @@
+def test_dummy():
+    assert 1 == 1

tox.ini

@@ -0,0 +1,25 @@
+[tox]
+skipsdist = True
+requires =
+    tox >= 2.0
+
+[flake8]
+exclude =
+    .git,
+    __pycache__,
+    *.pyc,
+    .cache,
+    .tox
+max-line-length = 120
+
+[testenv]
+platform = linux
+basepython = python3
+deps =
+    -rtest-requirements.txt
+
+[testenv:flake8]
+commands = flake8 powertrain_build tests
+
+[testenv:pytest]
+commands = python -m pytest tests

zuul.d/projects.yaml

@@ -1,7 +1,9 @@
 - project:
     check:
       jobs:
+        - powertrain-build-tox
         - noop
     gate:
       jobs:
+        - powertrain-build-tox
         - noop

zuul.d/tox.yaml

@@ -0,0 +1,5 @@
+- job:
+    name: powertrain-build-tox
+    parent: tox
+    vars:
+      tox_envlist: flake8,pytest