Only run validator tests for optional configuration

These require the optional dependencies

Author: jonmmease

tox.ini

@@ -74,46 +74,49 @@ basepython={env:PLOTLY_TOX_PYTHON_27:}
 commands=
     python --version
     nosetests {posargs} -x plotly/tests/test_core
-    pytest _plotly_utils/tests/
 
 [testenv:py34-core]
 basepython={env:PLOTLY_TOX_PYTHON_34:}
 commands=
     python --version
     nosetests {posargs} -x plotly/tests/test_core
-    pytest _plotly_utils/tests/
 
 [testenv:py35-core]
 basepython={env:PLOTLY_TOX_PYTHON_35:}
 commands=
     python --version
     nosetests {posargs} -x plotly/tests/test_core
-    pytest _plotly_utils/tests/
 
 [testenv:py36-core]
 basepython={env:PLOTLY_TOX_PYTHON_36:}
 commands=
     python --version
     nosetests {posargs} -x plotly/tests/test_core
-    pytest _plotly_utils/tests/
 
 [testenv:py37-core]
 basepython={env:PLOTLY_TOX_PYTHON_37:}
 commands=
     python --version
     nosetests {posargs} -x plotly/tests/test_core
-    pytest _plotly_utils/tests/
 
 ; OPTIONAL ENVIRONMENTS
+;[testenv:py27-optional]
+;basepython={env:PLOTLY_TOX_PYTHON_27:}
+;commands=
+;    python --version
+;;   Do some coverage reporting. No need to do this for all environments.
+;    mkdir -p {envbindir}/../../coverage-reports/{envname}
+;    coverage erase
+;    coverage run --include="*/plotly/*" --omit="*/tests*" {envbindir}/nosetests {posargs} -x plotly/tests
+;    coverage html -d "{envbindir}/../../coverage-reports/{envname}" --title={envname}
+
 [testenv:py27-optional]
 basepython={env:PLOTLY_TOX_PYTHON_27:}
 commands=
     python --version
-;   Do some coverage reporting. No need to do this for all environments.
-    mkdir -p {envbindir}/../../coverage-reports/{envname}
-    coverage erase
-    coverage run --include="*/plotly/*" --omit="*/tests*" {envbindir}/nosetests {posargs} -x plotly/tests
-    coverage html -d "{envbindir}/../../coverage-reports/{envname}" --title={envname}
+    nosetests {posargs} -x plotly/tests/test_core
+    nosetests {posargs} -x plotly/tests/test_optional
+    pytest _plotly_utils/tests/
 
 [testenv:py34-optional]
 basepython={env:PLOTLY_TOX_PYTHON_34:}