Travis: Clean up config, update pytest invocation (#219)

Similar commits in other cihai projects:
- cihai/cihai@5bf47d2
- cihai/unihan-db@54a6a98
- cihai/unihan-etl@051bd6d

Similar PRs in other cihai projects:
- cihai/cihai#244
- cihai/unihan-db#225
- cihai/unihan-etl#196

Pytest references:
- http://doc.pytest.org/en/5.3.2/changelog.html#pytest-3-6-2-2018-06-20
- pytest-dev/pytest#3552

.travis.yml

@@ -3,20 +3,14 @@ sudo: false
 dist: bionic  # 18.04
 python:
   - 2.7
-  - 3.6
   - 3.7
   - pypy3
 if: (type = push AND branch IN (master)) OR (type = pull_request)
-cache: pip
-before_install:
-  - export PIP_USE_MIRRORS=true
-  - pip install -U pip setuptools
-  - pip install -U pytest mock # https://github.com/travis-ci/travis-ci/issues/4873
-  - pip install coveralls
-  - git config --global user.name 'travis-ci'
-  - git config --global user.email 'travis@nowhere.edu'
+cache:
+  - pip
 install:
-  - "pip install -e ."
-script: coverage run --source=cihai_cli setup.py test
+  - pip install -e .
+  - pip install -r requirements/test.txt
+script: py.test --cov=cihai_cli
 after_success:
   - bash <(curl -s https://codecov.io/bash)

Pipfile

@@ -13,6 +13,8 @@ pytest = "*"
 cihai-cli = {path = ".",editable = true}
 black = "==19.10b0"
 sphinx-issues = "*"
+pytest-cov = "*"
+coverage = "*"
 
 [packages]
 cihai = "~=0.9.0"

requirements/test.txt

@@ -1 +1,3 @@
-pytest<=5.1.0
+pytest<=6
+pytest-cov
+coverage

setup.py

@@ -4,7 +4,6 @@
 import sys
 
 from setuptools import setup
-from setuptools.command.test import test as TestCommand
 
 about = {}
 with open("cihai_cli/__about__.py") as fp:
@@ -22,22 +21,6 @@
     readme = open('README.rst').read()
 
 history = open('CHANGES').read().replace('.. :changelog:', '')
-
-
-class PyTest(TestCommand):
-    user_options = [('pytest-args=', 'a', "Arguments to pass to py.test")]
-
-    def initialize_options(self):
-        TestCommand.initialize_options(self)
-        self.pytest_args = []
-
-    def run_tests(self):
-        import pytest
-
-        errno = pytest.main(self.pytest_args)
-        sys.exit(errno)
-
-
 setup(
     name=about['__title__'],
     version=about['__version__'],
@@ -57,7 +40,6 @@ def run_tests(self):
     include_package_data=True,
     install_requires=install_reqs,
     tests_require=tests_reqs,
-    cmdclass={'test': PyTest},
     zip_safe=False,
     keywords=about['__title__'],
     entry_points=dict(console_scripts=['cihai=cihai_cli.cli:cli']),