* consolidate tox testenv command boilerplate

* add testenv that does not pass through or set any environment variables to ensure that local tests work without them

Author: mattsb42-aws

.travis.yml

@@ -34,6 +34,8 @@ matrix:
       env: TOXENV=py36-accept
     - python: 3.6
       env: TOXENV=py36-examples
+    - python: 3.6
+      env: TOXENV=nocmk
 # disabling Bandit run in Travis pending resolution of https://bugs.launchpad.net/bandit/+bug/1749603
 #    - python: 3.6
 #      env: TOXENV=bandit

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{27,34,35,36}-{local,integ,accept,examples},
+    py{27,34,35,36}-{local,integ,accept,examples}, nocmk,
     bandit, doc8, readme, docs,
     {flake8,pylint}{,-tests,-examples},
     vulture
@@ -18,6 +18,9 @@ envlist =
 # test-release :: Builds dist files and uploads to testpypi pypirc profile.
 # release :: Builds dist files and uploads to pypi pypirc profile.
 
+[testenv:base-command]
+commands = pytest --basetemp={envtmpdir} -l --cov aws_encryption_sdk {posargs}
+
 [testenv]
 passenv =
     # Identifies AWS KMS key id to use in integration tests
@@ -29,11 +32,18 @@ passenv =
 sitepackages = False
 deps = -rtest/requirements.txt
 commands =
-    local: pytest --cov aws_encryption_sdk -m local -l {posargs}
-    integ: pytest --cov aws_encryption_sdk -m integ -l {posargs}
-    accept: pytest --cov aws_encryption_sdk -m accept -l {posargs}
-    all: pytest --cov aws_encryption_sdk -l {posargs}
-    examples: pytest --cov examples/test/ -m examples -l {posargs}
+    local: {[testenv:base-command]commands} -m local
+    integ: {[testenv:base-command]commands} -m integ
+    accept: {[testenv:base-command]commands} -m accept
+    all: {[testenv:base-command]commands}
+    examples: {[testenv:base-command]commands} -m examples
+
+# Verify that local tests work without environment variables present
+[testenv:nocmk]
+basepython = python3
+sitepackages = False
+deps = -rtest/requirements.txt
+commands = {[testenv:base-command]commands} -m local
 
 # Linters
 [testenv:flake8]