CI: move clipboard tests to an allowed-failure test (pandas-dev#18251)

CI: change 2.7-build_test -> 3.6-build_test

Author: jreback

.travis.yml

@@ -52,10 +52,6 @@ matrix:
     - dist: trusty
       env:
         - JOB="3.5" TEST_ARGS="--skip-slow --skip-network" COVERAGE=true
-      addons:
-        apt:
-          packages:
-          - xsel
     - dist: trusty
       env:
         - JOB="3.6" TEST_ARGS="--skip-slow --skip-network" PANDAS_TESTING_MODE="deprecate" CONDA_FORGE=true
@@ -66,7 +62,11 @@ matrix:
     # In allow_failures
     - dist: trusty
       env:
-        - JOB="2.7_BUILD_TEST" TEST_ARGS="--skip-slow" BUILD_TEST=true
+        - JOB="3.6_BUILD_TEST" TEST_ARGS="--skip-slow" BUILD_TEST=true
+      addons:
+        apt:
+          packages:
+          - xsel
     # In allow_failures
     - dist: trusty
       env:
@@ -75,17 +75,17 @@ matrix:
     - dist: trusty
       env:
         - JOB="3.6_DOC" DOC=true
-      addons:
-        apt:
-          packages:
-          - xsel
     allow_failures:
       - dist: trusty
         env:
           - JOB="2.7_SLOW" SLOW=true
       - dist: trusty
         env:
-          - JOB="2.7_BUILD_TEST" TEST_ARGS="--skip-slow" BUILD_TEST=true
+          - JOB="3.6_BUILD_TEST" TEST_ARGS="--skip-slow" BUILD_TEST=true
+        addons:
+          apt:
+            packages:
+            - xsel
       - dist: trusty
         env:
           - JOB="3.6_NUMPY_DEV" TEST_ARGS="--skip-slow --skip-network" PANDAS_TESTING_MODE="deprecate"

ci/requirements-2.7_BUILD_TEST.build

@@ -0,0 +1,6 @@
+python=3.6*
+python-dateutil
+pytz
+nomkl
+numpy
+cython

ci/requirements-3.6_BUILD_TEST.build

@@ -2,6 +2,6 @@
 
 source activate pandas
 
-echo "install 27 BUILD_TEST"
+echo "install 36 BUILD_TEST"
 
 conda install -n pandas -c conda-forge pyarrow dask

ci/requirements-2.7_BUILD_TEST.pip renamed to ci/requirements-3.6_BUILD_TEST.pip

@@ -27,6 +27,11 @@ if [ "$BUILD_TEST" ]; then
     echo "[running]"
     cd /tmp
     unset PYTHONPATH
+
+    echo "[build-test: single]"
+    python -c 'import pandas; pandas.test(["--skip-slow", "--skip-network", "-r xX", "-m single"])'
+
+    echo "[build-test: not single]"
     python -c 'import pandas; pandas.test(["-n 2", "--skip-slow", "--skip-network", "-r xX", "-m not single"])'
 
 elif [ "$DOC" ]; then