Created starter files for the project.

venv/Lib/site-packages/numpy/distutils/tests/test_shell_utils.py

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+import pytest
+import subprocess
+import json
+import sys
+
+from numpy.distutils import _shell_utils
+
+argv_cases = [
+    [r'exe'],
+    [r'path/exe'],
+    [r'path\exe'],
+    [r'\\server\path\exe'],
+    [r'path to/exe'],
+    [r'path to\exe'],
+
+    [r'exe', '--flag'],
+    [r'path/exe', '--flag'],
+    [r'path\exe', '--flag'],
+    [r'path to/exe', '--flag'],
+    [r'path to\exe', '--flag'],
+
+    # flags containing literal quotes in their name
+    [r'path to/exe', '--flag-"quoted"'],
+    [r'path to\exe', '--flag-"quoted"'],
+    [r'path to/exe', '"--flag-quoted"'],
+    [r'path to\exe', '"--flag-quoted"'],
+]
+
+
+@pytest.fixture(params=[
+    _shell_utils.WindowsParser,
+    _shell_utils.PosixParser
+])
+def Parser(request):
+    return request.param
+
+
+@pytest.fixture
+def runner(Parser):
+    if Parser != _shell_utils.NativeParser:
+        pytest.skip('Unable to run with non-native parser')
+
+    if Parser == _shell_utils.WindowsParser:
+        return lambda cmd: subprocess.check_output(cmd)
+    elif Parser == _shell_utils.PosixParser:
+        # posix has no non-shell string parsing
+        return lambda cmd: subprocess.check_output(cmd, shell=True)
+    else:
+        raise NotImplementedError
+
+
+@pytest.mark.parametrize('argv', argv_cases)
+def test_join_matches_subprocess(Parser, runner, argv):
+    """
+    Test that join produces strings understood by subprocess
+    """
+    # invoke python to return its arguments as json
+    cmd = [
+        sys.executable, '-c',
+        'import json, sys; print(json.dumps(sys.argv[1:]))'
+    ]
+    joined = Parser.join(cmd + argv)
+    json_out = runner(joined).decode()
+    assert json.loads(json_out) == argv
+
+
+@pytest.mark.parametrize('argv', argv_cases)
+def test_roundtrip(Parser, argv):
+    """
+    Test that split is the inverse operation of join
+    """
+    try:
+        joined = Parser.join(argv)
+        assert argv == Parser.split(joined)
+    except NotImplementedError:
+        pytest.skip("Not implemented")