Fix publishing of coverage results to coveralls.io (+ misc test config updates)

.travis.yml

@@ -1,29 +1,29 @@
+dist: xenial
 language: python
-dist: trusty
-sudo: false
 cache: pip
-python: 3.6
 
-env:
-  - TOXENV=py27
-  - TOXENV=py34
-  - TOXENV=py36
+matrix:
+  include:
+    - python: "2.7"
+      env: TOXENV=py27
+    - python: "3.4"
+      env: TOXENV=py34
+    - python: "3.5"
+      env: TOXENV=py35
+    - python: "3.6"
+      env: TOXENV=py36
 
-before_script:
-  - pip install pylint bandit tox
+install:
+  - pip install tox coveralls
 
 script:
-  - pylint tuf
-  - bandit -r tuf
   - tox
 
 after_success:
-  - cd tests
-  - coveralls
-  - cd -
-
-branches:
-  only:
-    - develop
-    - pylint
-    - bandit
+  # Workaround to get coverage reports with relative paths.
+  # FIXME: Consider refactoring the tests to not require the test aggregation
+  # script being invoked from the `tests` directory, so that `.coverage` is
+  # written to and .coveragrc can also reside in the project root directory, as
+  # is the convention.
+  - cp tests/.coverage .
+  - coveralls --rcfile=tests/.coveragerc

ci-requirements.txt

@@ -1,7 +1,9 @@
 securesystemslib[crypto,pynacl]
 six
 iso8601
-coverage
-coveralls
-pylint
 requests
+pylint
+bandit
+# Pin to versions supported by `coveralls` (see .travis.yml)
+# https://github.com/coveralls-clients/coveralls-python/releases/tag/1.8.1
+coverage<5.0

tests/.coveragerc

@@ -1,13 +1,15 @@
 [run]
 branch = True
 
+omit =
+    # Command-line scripts.
+    */tuf/scripts/client.py
+    */tuf/scripts/repo.py
+    */tests/*
+    */site-packages/*
+
 [report]
 exclude_lines =
     pragma: no cover
     def __str__
     if __name__ == .__main__.:
-
-omit =
-    # Command-line scripts.
-    */tuf/scripts/client.py
-    */tuf/scripts/repo.py

tests/aggregate_tests.py

@@ -93,6 +93,7 @@
   suite = unittest.TestLoader().loadTestsFromNames(test_modules_to_run)
   all_tests_passed = unittest.TextTestRunner(
       verbosity=1, buffer=True).run(suite).wasSuccessful()
+
   if not all_tests_passed:
     sys.exit(1)
 

tox.ini

@@ -5,15 +5,24 @@
 
 [tox]
 envlist = py27, py34, py35, py36
+skipsdist = true
 
 [testenv]
+# TODO: Consider refactoring the tests to not require the aggregation script
+# being invoked from the `tests` directory. This seems to be the convention and
+# would make use of other testing tools such as coverage/coveralls easier.
 changedir = tests
 
 commands =
-    coverage run --source tuf aggregate_tests.py
+    pylint {toxinidir}/tuf
+    bandit -r {toxinidir}/tuf
+    coverage run aggregate_tests.py
     coverage report -m --fail-under 97
 
 deps =
     -r{toxinidir}/ci-requirements.txt
+    # Install TUF in editable mode, instead of tox default virtual environment
+    # installation (see `skipsdist`), to get relative paths in coverage reports
+    --editable {toxinidir}
 
 install_command = pip install --pre {opts} {packages}