ci: tox/Travis: use pexpect for dep only

For #5306 I would have to add
`testing/test_pytester.py` to the default pos args, but that would run
all other tests therein additionally.

This also adds pexpect tests to the MacOS job, which appears to have
caused trouble at least in the past, and likely needs fixing here before
this works.

Author: blueyed

.travis.yml

@@ -28,7 +28,8 @@ jobs:
       language: generic
       # Coverage for:
       # - py2 with symlink in test_cmdline_python_package_symlink.
-      env: TOXENV=py27-xdist PYTEST_COVERAGE=1
+      # - _pytest.unittest._handle_skip (via pexpect).
+      env: TOXENV=py27-pexpect-xdist PYTEST_COVERAGE=1
       before_install:
         - python -V
         - test $(python -c 'import sys; print("%d%d" % sys.version_info[0:2])') = 27
@@ -62,8 +63,9 @@ jobs:
     # - pytester's LsofFdLeakChecker
     # - TestArgComplete (linux only)
     # - numpy
+    # - test_sys_breakpoint_interception (via pexpect).
     # Empty PYTEST_ADDOPTS to run this non-verbose.
-    - env: TOXENV=py37-lsof-numpy-xdist PYTEST_COVERAGE=1 PYTEST_ADDOPTS=
+    - env: TOXENV=py37-lsof-numpy-pexpect-xdist PYTEST_COVERAGE=1 PYTEST_ADDOPTS=
 
     # Specialized factors for py27.
     - env: TOXENV=py27-nobyte-numpy-xdist
@@ -72,9 +74,7 @@ jobs:
       python: '2.7'
 
     # Specialized factors for py37.
-    # Coverage for:
-    # - test_sys_breakpoint_interception (via pexpect).
-    - env: TOXENV=py37-pexpect,py37-twisted PYTEST_COVERAGE=1
+    - env: TOXENV=py37-twisted PYTEST_COVERAGE=1
     - env: TOXENV=py37-pluggymaster-xdist
     - env: TOXENV=py37-freeze
 
@@ -84,9 +84,7 @@ jobs:
       if: type = cron
 
     - stage: baseline
-    # Coverage for:
-    # - _pytest.unittest._handle_skip (via pexpect).
-      env: TOXENV=py27-pexpect,py27-twisted PYTEST_COVERAGE=1
+      env: TOXENV=py27-twisted PYTEST_COVERAGE=1
       python: '2.7'
     # Use py36 here for faster baseline.
     - env: TOXENV=py36-xdist

tox.ini

@@ -26,7 +26,7 @@ commands =
     coverage: coverage report
 passenv = USER USERNAME COVERAGE_* TRAVIS PYTEST_ADDOPTS
 setenv =
-    _PYTEST_TOX_DEFAULT_POSARGS={env:_PYTEST_TOX_POSARGS_LSOF:} {env:_PYTEST_TOX_POSARGS_PEXPECT:} {env:_PYTEST_TOX_POSARGS_TWISTED:} {env:_PYTEST_TOX_POSARGS_XDIST:}
+    _PYTEST_TOX_DEFAULT_POSARGS={env:_PYTEST_TOX_POSARGS_LSOF:} {env:_PYTEST_TOX_POSARGS_TWISTED:} {env:_PYTEST_TOX_POSARGS_XDIST:}
 
     # Configuration to run with coverage similar to Travis/Appveyor, e.g.
     # "tox -e py37-coverage".
@@ -40,7 +40,6 @@ setenv =
     lsof: _PYTEST_TOX_POSARGS_LSOF=--lsof
 
     pexpect: _PYTEST_TOX_PLATFORM=linux|darwin
-    pexpect: _PYTEST_TOX_POSARGS_PEXPECT=testing/test_pdb.py testing/test_terminal.py testing/test_unittest.py
 
     twisted: _PYTEST_TOX_POSARGS_TWISTED=testing/test_unittest.py