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gh-131178: Add tests for cProfile command-line interface #144918

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75 changes: 72 additions & 3 deletions Lib/test/test_profiling/test_tracing_profiler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -152,11 +152,80 @@ def test_bad_descriptor(self):


class TestCommandLine(unittest.TestCase):
def test_sort(self):
rc, out, err = assert_python_failure('-m', 'cProfile', '-s', 'demo')
self.assertGreater(rc, 0)
def test_help(self):
for flag in ('-h', '--help'):
with self.subTest(flag=flag):
_, out, _ = assert_python_ok('-m', 'cProfile', flag)
self.assertIn(b'Usage: cProfile.py', out)
self.assertIn(b'-o OUTFILE', out)
self.assertIn(b'-s SORT', out)

def test_no_args(self):
rc, out, _ = assert_python_failure('-m', 'cProfile')
self.assertEqual(rc, 2)
self.assertIn(b'Usage: cProfile.py', out)

def test_unknown_option(self):
rc, _, err = assert_python_failure('-m', 'cProfile', '--unknown')
self.assertEqual(rc, 2)
self.assertIn(b'no such option', err)

def test_invalid_sort(self):
rc, _, err = assert_python_failure('-m', 'cProfile', '-s', 'demo')
self.assertEqual(rc, 2)
self.assertIn(b"option -s: invalid choice: 'demo'", err)

def test_valid_sort(self):
with tempfile.NamedTemporaryFile("w", suffix=".py",
delete_on_close=False) as f:
f.write("def f(): pass\nf()\n")
f.close()
for sort_key in ('calls', 'cumtime', 'tottime', 'name'):
for flag in ('-s', '--sort'):
with self.subTest(sort_key=sort_key, flag=flag):
_, out, _ = assert_python_ok(
'-m', 'cProfile', flag, sort_key, f.name
)
self.assertIn(b'function calls', out)

def test_outfile(self):
with tempfile.NamedTemporaryFile("w", suffix=".py",
delete_on_close=False) as script:
script.write("def f(): pass\nf()\n")
script.close()
outfile = tempfile.NamedTemporaryFile(delete=False)
outfile.close()
self.addCleanup(support.os_helper.unlink, outfile.name)
for flag in ('-o', '--outfile'):
with self.subTest(flag=flag):
assert_python_ok(
'-m', 'cProfile', flag, outfile.name, script.name
)
with open(outfile.name, 'rb') as f:
self.assertGreater(len(f.read()), 0)

def test_profile_script(self):
with tempfile.NamedTemporaryFile("w", suffix=".py",
delete_on_close=False) as f:
f.write("def f(): pass\nf()\n")
f.close()
_, out, _ = assert_python_ok('-m', 'cProfile', f.name)
self.assertIn(b'function calls', out)
self.assertIn(b'Ordered by', out)

def test_profile_module(self):
_, out, _ = assert_python_ok(
'-m', 'cProfile', '-m', 'timeit', '-n', '1', 'pass'
)
self.assertIn(b'function calls', out)

def test_nonexistent_script(self):
rc, _, err = assert_python_failure(
'-m', 'cProfile', 'nonexistent_script.py'
)
self.assertEqual(rc, 1)
self.assertIn(b'No such file or directory', err)

def test_profile_script_importing_main(self):
"""Check that scripts that reference __main__ see their own namespace
when being profiled."""
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