Remove obsolete setuptools test integration

`make pytest` already runs a superset of all the tests run by `python3
setup-css.py test` and `python3 setup-js.py test`.  (The former didn't
work anyway due to a typo.)

Fixes: #2300, #2301

python/setup-css.py

@@ -1,32 +1,8 @@
 #!/usr/bin/env python
 
-import os
-import sys
-
 from setuptools import setup
 from cssbeautifier.__version__ import __version__
 
-from setuptools.command.test import test as TestCommand
-
-DIR_CSS = "cssbeautifier/tests/"
-
-
-class PyTestCSS(TestCommand):
-    user_options = [("pytest-args=", "a", "Arguments to pass to py.test")]
-
-    def initialize_options(self):
-        TestCommand.initialize_options(self)
-        self.pytest_args = ["--assert=plain"] + [
-            DIR + x for x in os.listdir(DIR) if x.endswith(".py") and x[0] not in "._"
-        ]
-
-    def run_tests(self):
-        # import here, cause outside the eggs aren't loaded
-        import pytest
-
-        errno = pytest.main(self.pytest_args)
-        sys.exit(errno)
-
 
 setup(
     name="cssbeautifier",
@@ -45,6 +21,4 @@ def run_tests(self):
     ],
     install_requires=["jsbeautifier", "six>=1.13.0", "editorconfig>=0.12.2"],
     license="MIT",
-    test_suite="pytest.collector",
-    cmdclass={"test": PyTestCSS},
 )

python/setup-js.py

@@ -1,32 +1,8 @@
 #!/usr/bin/env python
 
-import os
-import sys
-
 from setuptools import setup
 from jsbeautifier.__version__ import __version__
 
-from setuptools.command.test import test as TestCommand
-
-DIR = "jsbeautifier/tests/"
-
-
-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 = ["--assert=plain"] + [
-            DIR + x for x in os.listdir(DIR) if x.endswith(".py") and x[0] not in "._"
-        ]
-
-    def run_tests(self):
-        # import here, cause outside the eggs aren't loaded
-        import pytest
-
-        errno = pytest.main(self.pytest_args)
-        sys.exit(errno)
-
 
 setup(
     name="jsbeautifier",
@@ -52,6 +28,4 @@ def run_tests(self):
     ],
     install_requires=["six>=1.13.0", "editorconfig>=0.12.2"],
     license="MIT",
-    test_suite="pytest.collector",
-    cmdclass={"test": PyTest},
 )