tests: consolidate cli runner

Signed-off-by: Jan Kowalleck <jan.kowalleck@gmail.com>

cyclonedx_py/_internal/cli.py

@@ -18,8 +18,9 @@
 import logging
 import sys
 from argparse import ArgumentParser, FileType, RawDescriptionHelpFormatter
+from collections.abc import Sequence
 from itertools import chain
-from typing import TYPE_CHECKING, Any, Dict, List, Optional, TextIO, Type
+from typing import TYPE_CHECKING, Any, Dict, NoReturn, Optional, TextIO, Type, Union
 
 from cyclonedx.model import Property
 from cyclonedx.output import make_outputter
@@ -256,7 +257,7 @@ def __call__(self,
         self._write(output, outfile)
 
 
-def run(*, argv: Optional[List[str]] = None, **kwargs: Any) -> int:
+def run(*, argv: Optional[Sequence[str]] = None, **kwargs: Any) -> Union[int, NoReturn]:
     arg_co = ArgumentParser(add_help=False)
     arg_co.add_argument('-v', '--verbose',
                         help='Increase the verbosity of messages'
@@ -267,7 +268,7 @@ def run(*, argv: Optional[List[str]] = None, **kwargs: Any) -> int:
                         default=0)
     arg_parser = Command.make_argument_parser(**kwargs, sco=arg_co)
     del arg_co, kwargs
-    args = vars(arg_parser.parse_args(argv))
+    args = vars(arg_parser.parse_args(argv))  # may exit -> raise `SystemExit`
     if args['command'] is None:
         # print the "help" page on error, instead of printing "usage" page
         # this is done to have a better user experience.

tests/integration/__init__.py

@@ -14,3 +14,26 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 # Copyright (c) OWASP Foundation. All Rights Reserved.
+
+
+from contextlib import redirect_stderr, redirect_stdout
+from io import BytesIO, StringIO, TextIOWrapper
+from typing import Any, Optional
+from unittest.mock import patch
+
+from cyclonedx_py._internal.cli import run as _run_cli
+
+
+def run_cli(*args: str, inp: Optional[Any] = None) -> (int, str, str):
+    with StringIO() as err, StringIO() as out:
+        err.name = '<fakeerr>'
+        out.name = '<fakeout>'
+        with redirect_stderr(err), redirect_stdout(out):
+            with patch('sys.stdin', TextIOWrapper(inp or BytesIO())):
+                try:
+                    c_res = _run_cli(argv=args, exit_on_error=False)
+                except SystemExit as e:
+                    c_res = e.code
+            c_out = out.getvalue()
+            c_err = err.getvalue()
+        return c_res, c_out, c_err

tests/integration/test_cli.py

@@ -21,15 +21,21 @@
 from unittest import TestCase
 
 from cyclonedx_py import __version__
+from tests.integration import run_cli
 
 
-class TestPipenv(TestCase):
+class TestCli(TestCase):
 
-    def test_call_as_module(self) -> None:
+    def test_version_as_module(self) -> None:
         # show that this thing is callable as a module
         # show that the version is the one expected
         res = run(  # nosec:B603
             (executable, '-m', 'cyclonedx_py', '--version'),
             capture_output=True, encoding='utf8', shell=False)
         self.assertEqual(0, res.returncode, '\n'.join((res.stdout, res.stderr)))
         self.assertIn(__version__, res.stdout)
+
+    def test_version(self) -> None:
+        res, out, err = run_cli('--version')
+        self.assertEqual(0, res, '\n'.join((out, err)))
+        self.assertIn(__version__, out)

tests/integration/test_cli_environment.py

@@ -16,9 +16,7 @@
 # Copyright (c) OWASP Foundation. All Rights Reserved.
 
 import random
-from contextlib import redirect_stderr, redirect_stdout
 from glob import glob
-from io import StringIO
 from os import name as os_name
 from os.path import basename, dirname, join
 from subprocess import run  # nosec:B404
@@ -29,8 +27,8 @@
 from cyclonedx.schema import OutputFormat, SchemaVersion
 from ddt import ddt, named_data
 
-from cyclonedx_py._internal.cli import run as run_cli
 from tests import INFILES_DIRECTORY, INIT_TESTBEDS, SUPPORTED_OF_SV, SnapshotMixin, make_comparable
+from tests.integration import run_cli
 
 initfiles = glob(join(INFILES_DIRECTORY, 'environment', '*', 'init.py'))
 test_data = tuple(
@@ -68,19 +66,13 @@ def setUpClass(cls) -> None:
     )
     def test_fails_with_python_not_found(self, wrong_python: str, expected_error: str) -> None:
         _, _, sv, of = random.choice(test_data)  # nosec B311
-        with StringIO() as err, StringIO() as out:
-            err.name = '<fakeerr>'
-            out.name = '<fakeout>'
-            with redirect_stderr(err), redirect_stdout(out):
-                res = run_cli(argv=[
-                    'environment',
-                    '-vvv',
-                    f'--sv={sv.to_version()}',
-                    f'--of={of.name}',
-                    '--outfile=-',
-                    wrong_python])
-            err = err.getvalue()
-            out = out.getvalue()
+        res, out, err = run_cli(
+            'environment',
+            '-vvv',
+            f'--sv={sv.to_version()}',
+            f'--of={of.name}',
+            '--outfile=-',
+            wrong_python)
         self.assertNotEqual(0, res, err)
         self.assertIn(expected_error, err)
 
@@ -91,76 +83,52 @@ def test_fails_with_python_not_found(self, wrong_python: str, expected_error: st
     @skipIf(os_name == 'nt', 'cannot run on win')
     def test_fails_with_python_unexpected(self, wrong_python: str, expected_error: str) -> None:
         _, _, sv, of = random.choice(test_data)  # nosec B311
-        with StringIO() as err, StringIO() as out:
-            err.name = '<fakeerr>'
-            out.name = '<fakeout>'
-            with redirect_stderr(err), redirect_stdout(out):
-                res = run_cli(argv=[
-                    'environment',
-                    '-vvv',
-                    f'--sv={sv.to_version()}',
-                    f'--of={of.name}',
-                    '--outfile=-',
-                    wrong_python])
-            err = err.getvalue()
-            out = out.getvalue()
+        res, out, err = run_cli(
+            'environment',
+            '-vvv',
+            f'--sv={sv.to_version()}',
+            f'--of={of.name}',
+            '--outfile=-',
+            wrong_python)
         self.assertNotEqual(0, res, err)
         self.assertIn(expected_error, err)
 
     def test_with_pyproject_not_found(self) -> None:
         _, projectdir, sv, of = random.choice(test_data)  # nosec B311
-        with StringIO() as err, StringIO() as out:
-            err.name = '<fakeerr>'
-            out.name = '<fakeout>'
-            with redirect_stderr(err), redirect_stdout(out):
-                res = run_cli(argv=[
-                    'environment',
-                    '-vvv',
-                    '--sv', sv.to_version(),
-                    '--of', of.name,
-                    '--outfile=-',
-                    '--pyproject=something-that-must-not-exist.testing',
-                    projectdir
-                ])
-            err = err.getvalue()
-            out = out.getvalue()
+        res, out, err = run_cli(
+            'environment',
+            '-vvv',
+            '--sv', sv.to_version(),
+            '--of', of.name,
+            '--outfile=-',
+            '--pyproject=something-that-must-not-exist.testing',
+            projectdir
+        )
         self.assertNotEqual(0, res, err)
         self.assertIn('Could not open pyproject file: something-that-must-not-exist.testing', err)
 
     def test_with_current_python(self) -> None:
         sv = SchemaVersion.V1_6
         of = random.choice((OutputFormat.XML, OutputFormat.JSON))  # nosec B311
-        with StringIO() as err, StringIO() as out:
-            err.name = '<fakeerr>'
-            out.name = '<fakeout>'
-            with redirect_stderr(err), redirect_stdout(out):
-                res = run_cli(argv=[
-                    'environment',
-                    '-vvv',
-                    '--sv', sv.to_version(),
-                    '--of', of.name,
-                    '--output-reproducible',
-                    '--outfile=-',
-                    # no project dir -> search in current python
-                ])
-                err = err.getvalue()
-                sbom1 = out.getvalue()
+        res, sbom1, err = run_cli(
+            'environment',
+            '-vvv',
+            '--sv', sv.to_version(),
+            '--of', of.name,
+            '--output-reproducible',
+            '--outfile=-',
+            # no project dir -> search in current python
+        )
         self.assertEqual(0, res, err)
-        with StringIO() as err, StringIO() as out:
-            err.name = '<fakeerr>'
-            out.name = '<fakeout>'
-            with redirect_stderr(err), redirect_stdout(out):
-                res = run_cli(argv=[
-                    'environment',
-                    '-vvv',
-                    '--sv', sv.to_version(),
-                    '--of', of.name,
-                    '--output-reproducible',
-                    '--outfile=-',
-                    executable  # explicitly current python
-                ])
-            err = err.getvalue()
-            sbom2 = out.getvalue()
+        res, sbom2, err = run_cli(
+            'environment',
+            '-vvv',
+            '--sv', sv.to_version(),
+            '--of', of.name,
+            '--output-reproducible',
+            '--outfile=-',
+            executable  # explicitly current python
+        )
         self.assertEqual(0, res, err)
         self.assertEqual(
             make_comparable(sbom1, of),
@@ -169,85 +137,61 @@ def test_with_current_python(self) -> None:
 
     @named_data(*test_data)
     def test_plain_as_expected(self, projectdir: str, sv: SchemaVersion, of: OutputFormat) -> None:
-        with StringIO() as err, StringIO() as out:
-            err.name = '<fakeerr>'
-            out.name = '<fakeout>'
-            with redirect_stderr(err), redirect_stdout(out):
-                res = run_cli(argv=[
-                    'environment',
-                    '-vvv',
-                    '--sv', sv.to_version(),
-                    '--of', of.name,
-                    '--output-reproducible',
-                    '--outfile=-',
-                    '--pyproject', join(projectdir, 'pyproject.toml'),
-                    join(projectdir, '.venv')])
-            err = err.getvalue()
-            out = out.getvalue()
+        res, out, err = run_cli(
+            'environment',
+            '-vvv',
+            '--sv', sv.to_version(),
+            '--of', of.name,
+            '--output-reproducible',
+            '--outfile=-',
+            '--pyproject', join(projectdir, 'pyproject.toml'),
+            join(projectdir, '.venv'))
         self.assertEqual(0, res, err)
         self.assertEqualSnapshot(out, 'plain', projectdir, sv, of)
 
     @named_data(*test_data_file_filter('pep639'))
     def test_pep639_as_expected(self, projectdir: str, sv: SchemaVersion, of: OutputFormat) -> None:
-        with StringIO() as err, StringIO() as out:
-            err.name = '<fakeerr>'
-            out.name = '<fakeout>'
-            with redirect_stderr(err), redirect_stdout(out):
-                res = run_cli(argv=[
-                    'environment',
-                    '-vvv',
-                    '--sv', sv.to_version(),
-                    '--of', of.name,
-                    '--output-reproducible',
-                    '--outfile=-',
-                    '--pyproject', join(projectdir, 'pyproject.toml'),
-                    '--PEP-639',
-                    join(projectdir, '.venv')])
-            err = err.getvalue()
-            out = out.getvalue()
+        res, out, err = run_cli(
+            'environment',
+            '-vvv',
+            '--sv', sv.to_version(),
+            '--of', of.name,
+            '--output-reproducible',
+            '--outfile=-',
+            '--pyproject', join(projectdir, 'pyproject.toml'),
+            '--PEP-639',
+            join(projectdir, '.venv'))
         self.assertEqual(0, res, err)
         self.assertEqualSnapshot(out, 'pep639', projectdir, sv, of)
 
     @named_data(*test_data_file_filter('pep639'))
     def test_pep639_texts_as_expected(self, projectdir: str, sv: SchemaVersion, of: OutputFormat) -> None:
-        with StringIO() as err, StringIO() as out:
-            err.name = '<fakeerr>'
-            out.name = '<fakeout>'
-            with redirect_stderr(err), redirect_stdout(out):
-                res = run_cli(argv=[
-                    'environment',
-                    '-vvv',
-                    '--sv', sv.to_version(),
-                    '--of', of.name,
-                    '--output-reproducible',
-                    '--outfile=-',
-                    '--pyproject', join(projectdir, 'pyproject.toml'),
-                    '--PEP-639',
-                    '--gather-license-texts',
-                    join(projectdir, '.venv')])
-            err = err.getvalue()
-            out = out.getvalue()
+        res, out, err = run_cli(
+            'environment',
+            '-vvv',
+            '--sv', sv.to_version(),
+            '--of', of.name,
+            '--output-reproducible',
+            '--outfile=-',
+            '--pyproject', join(projectdir, 'pyproject.toml'),
+            '--PEP-639',
+            '--gather-license-texts',
+            join(projectdir, '.venv'))
         self.assertEqual(0, res, err)
         self.assertEqualSnapshot(out, 'pep639-texts', projectdir, sv, of)
 
     @named_data(*test_data_file_filter('pep639'))
     def test_texts_as_expected(self, projectdir: str, sv: SchemaVersion, of: OutputFormat) -> None:
-        with StringIO() as err, StringIO() as out:
-            err.name = '<fakeerr>'
-            out.name = '<fakeout>'
-            with redirect_stderr(err), redirect_stdout(out):
-                res = run_cli(argv=[
-                    'environment',
-                    '-vvv',
-                    '--sv', sv.to_version(),
-                    '--of', of.name,
-                    '--output-reproducible',
-                    '--outfile=-',
-                    '--pyproject', join(projectdir, 'pyproject.toml'),
-                    '--gather-license-texts',
-                    join(projectdir, '.venv')])
-            err = err.getvalue()
-            out = out.getvalue()
+        res, out, err = run_cli(
+            'environment',
+            '-vvv',
+            '--sv', sv.to_version(),
+            '--of', of.name,
+            '--output-reproducible',
+            '--outfile=-',
+            '--pyproject', join(projectdir, 'pyproject.toml'),
+            '--gather-license-texts',
+            join(projectdir, '.venv'))
         self.assertEqual(0, res, err)
         self.assertEqualSnapshot(out, 'texts', projectdir, sv, of)