diff options
Diffstat (limited to 'Lib/test/test_timeit.py')
| -rw-r--r-- | Lib/test/test_timeit.py | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/Lib/test/test_timeit.py b/Lib/test/test_timeit.py new file mode 100644 index 0000000..eb3b1a1 --- /dev/null +++ b/Lib/test/test_timeit.py @@ -0,0 +1,305 @@ +import timeit +import unittest +import sys +import io +import time +from textwrap import dedent + +from test.support import run_unittest +from test.support import captured_stdout +from test.support import captured_stderr + +# timeit's default number of iterations. +DEFAULT_NUMBER = 1000000 + +# timeit's default number of repetitions. +DEFAULT_REPEAT = 3 + +# XXX: some tests are commented out that would improve the coverage but take a +# long time to run because they test the default number of loops, which is +# large. The tests could be enabled if there was a way to override the default +# number of loops during testing, but this would require changing the signature +# of some functions that use the default as a default argument. + +class FakeTimer: + BASE_TIME = 42.0 + def __init__(self, seconds_per_increment=1.0): + self.count = 0 + self.setup_calls = 0 + self.seconds_per_increment=seconds_per_increment + timeit._fake_timer = self + + def __call__(self): + return self.BASE_TIME + self.count * self.seconds_per_increment + + def inc(self): + self.count += 1 + + def setup(self): + self.setup_calls += 1 + + def wrap_timer(self, timer): + """Records 'timer' and returns self as callable timer.""" + self.saved_timer = timer + return self + +class TestTimeit(unittest.TestCase): + + def tearDown(self): + try: + del timeit._fake_timer + except AttributeError: + pass + + def test_reindent_empty(self): + self.assertEqual(timeit.reindent("", 0), "") + self.assertEqual(timeit.reindent("", 4), "") + + def test_reindent_single(self): + self.assertEqual(timeit.reindent("pass", 0), "pass") + self.assertEqual(timeit.reindent("pass", 4), "pass") + + def test_reindent_multi_empty(self): + self.assertEqual(timeit.reindent("\n\n", 0), "\n\n") + self.assertEqual(timeit.reindent("\n\n", 4), "\n \n ") + + def test_reindent_multi(self): + self.assertEqual(timeit.reindent( + "print()\npass\nbreak", 0), + "print()\npass\nbreak") + self.assertEqual(timeit.reindent( + "print()\npass\nbreak", 4), + "print()\n pass\n break") + + def test_timer_invalid_stmt(self): + self.assertRaises(ValueError, timeit.Timer, stmt=None) + + def test_timer_invalid_setup(self): + self.assertRaises(ValueError, timeit.Timer, setup=None) + + fake_setup = "import timeit; timeit._fake_timer.setup()" + fake_stmt = "import timeit; timeit._fake_timer.inc()" + + def fake_callable_setup(self): + self.fake_timer.setup() + + def fake_callable_stmt(self): + self.fake_timer.inc() + + def timeit(self, stmt, setup, number=None): + self.fake_timer = FakeTimer() + t = timeit.Timer(stmt=stmt, setup=setup, timer=self.fake_timer) + kwargs = {} + if number is None: + number = DEFAULT_NUMBER + else: + kwargs['number'] = number + delta_time = t.timeit(**kwargs) + self.assertEqual(self.fake_timer.setup_calls, 1) + self.assertEqual(self.fake_timer.count, number) + self.assertEqual(delta_time, number) + + # Takes too long to run in debug build. + #def test_timeit_default_iters(self): + # self.timeit(self.fake_stmt, self.fake_setup) + + def test_timeit_zero_iters(self): + self.timeit(self.fake_stmt, self.fake_setup, number=0) + + def test_timeit_few_iters(self): + self.timeit(self.fake_stmt, self.fake_setup, number=3) + + def test_timeit_callable_stmt(self): + self.timeit(self.fake_callable_stmt, self.fake_setup, number=3) + + def test_timeit_callable_stmt_and_setup(self): + self.timeit(self.fake_callable_stmt, + self.fake_callable_setup, number=3) + + # Takes too long to run in debug build. + #def test_timeit_function(self): + # delta_time = timeit.timeit(self.fake_stmt, self.fake_setup, + # timer=FakeTimer()) + # self.assertEqual(delta_time, DEFAULT_NUMBER) + + def test_timeit_function_zero_iters(self): + delta_time = timeit.timeit(self.fake_stmt, self.fake_setup, number=0, + timer=FakeTimer()) + self.assertEqual(delta_time, 0) + + def repeat(self, stmt, setup, repeat=None, number=None): + self.fake_timer = FakeTimer() + t = timeit.Timer(stmt=stmt, setup=setup, timer=self.fake_timer) + kwargs = {} + if repeat is None: + repeat = DEFAULT_REPEAT + else: + kwargs['repeat'] = repeat + if number is None: + number = DEFAULT_NUMBER + else: + kwargs['number'] = number + delta_times = t.repeat(**kwargs) + self.assertEqual(self.fake_timer.setup_calls, repeat) + self.assertEqual(self.fake_timer.count, repeat * number) + self.assertEqual(delta_times, repeat * [float(number)]) + + # Takes too long to run in debug build. + #def test_repeat_default(self): + # self.repeat(self.fake_stmt, self.fake_setup) + + def test_repeat_zero_reps(self): + self.repeat(self.fake_stmt, self.fake_setup, repeat=0) + + def test_repeat_zero_iters(self): + self.repeat(self.fake_stmt, self.fake_setup, number=0) + + def test_repeat_few_reps_and_iters(self): + self.repeat(self.fake_stmt, self.fake_setup, repeat=3, number=5) + + def test_repeat_callable_stmt(self): + self.repeat(self.fake_callable_stmt, self.fake_setup, + repeat=3, number=5) + + def test_repeat_callable_stmt_and_setup(self): + self.repeat(self.fake_callable_stmt, self.fake_callable_setup, + repeat=3, number=5) + + # Takes too long to run in debug build. + #def test_repeat_function(self): + # delta_times = timeit.repeat(self.fake_stmt, self.fake_setup, + # timer=FakeTimer()) + # self.assertEqual(delta_times, DEFAULT_REPEAT * [float(DEFAULT_NUMBER)]) + + def test_repeat_function_zero_reps(self): + delta_times = timeit.repeat(self.fake_stmt, self.fake_setup, repeat=0, + timer=FakeTimer()) + self.assertEqual(delta_times, []) + + def test_repeat_function_zero_iters(self): + delta_times = timeit.repeat(self.fake_stmt, self.fake_setup, number=0, + timer=FakeTimer()) + self.assertEqual(delta_times, DEFAULT_REPEAT * [0.0]) + + def assert_exc_string(self, exc_string, expected_exc_name): + exc_lines = exc_string.splitlines() + self.assertGreater(len(exc_lines), 2) + self.assertTrue(exc_lines[0].startswith('Traceback')) + self.assertTrue(exc_lines[-1].startswith(expected_exc_name)) + + def test_print_exc(self): + s = io.StringIO() + t = timeit.Timer("1/0") + try: + t.timeit() + except: + t.print_exc(s) + self.assert_exc_string(s.getvalue(), 'ZeroDivisionError') + + MAIN_DEFAULT_OUTPUT = "10 loops, best of 3: 1 sec per loop\n" + + def run_main(self, seconds_per_increment=1.0, switches=None, timer=None): + if timer is None: + timer = FakeTimer(seconds_per_increment=seconds_per_increment) + if switches is None: + args = [] + else: + args = switches[:] + args.append(self.fake_stmt) + # timeit.main() modifies sys.path, so save and restore it. + orig_sys_path = sys.path[:] + with captured_stdout() as s: + timeit.main(args=args, _wrap_timer=timer.wrap_timer) + sys.path[:] = orig_sys_path[:] + return s.getvalue() + + def test_main_bad_switch(self): + s = self.run_main(switches=['--bad-switch']) + self.assertEqual(s, dedent("""\ + option --bad-switch not recognized + use -h/--help for command line help + """)) + + def test_main_seconds(self): + s = self.run_main(seconds_per_increment=5.5) + self.assertEqual(s, "10 loops, best of 3: 5.5 sec per loop\n") + + def test_main_milliseconds(self): + s = self.run_main(seconds_per_increment=0.0055) + self.assertEqual(s, "100 loops, best of 3: 5.5 msec per loop\n") + + def test_main_microseconds(self): + s = self.run_main(seconds_per_increment=0.0000025, switches=['-n100']) + self.assertEqual(s, "100 loops, best of 3: 2.5 usec per loop\n") + + def test_main_fixed_iters(self): + s = self.run_main(seconds_per_increment=2.0, switches=['-n35']) + self.assertEqual(s, "35 loops, best of 3: 2 sec per loop\n") + + def test_main_setup(self): + s = self.run_main(seconds_per_increment=2.0, + switches=['-n35', '-s', 'print("CustomSetup")']) + self.assertEqual(s, "CustomSetup\n" * 3 + + "35 loops, best of 3: 2 sec per loop\n") + + def test_main_fixed_reps(self): + s = self.run_main(seconds_per_increment=60.0, switches=['-r9']) + self.assertEqual(s, "10 loops, best of 9: 60 sec per loop\n") + + def test_main_negative_reps(self): + s = self.run_main(seconds_per_increment=60.0, switches=['-r-5']) + self.assertEqual(s, "10 loops, best of 1: 60 sec per loop\n") + + def test_main_help(self): + s = self.run_main(switches=['-h']) + # Note: It's not clear that the trailing space was intended as part of + # the help text, but since it's there, check for it. + self.assertEqual(s, timeit.__doc__ + ' ') + + def test_main_using_time(self): + fake_timer = FakeTimer() + s = self.run_main(switches=['-t'], timer=fake_timer) + self.assertEqual(s, self.MAIN_DEFAULT_OUTPUT) + self.assertIs(fake_timer.saved_timer, time.time) + + def test_main_using_clock(self): + fake_timer = FakeTimer() + s = self.run_main(switches=['-c'], timer=fake_timer) + self.assertEqual(s, self.MAIN_DEFAULT_OUTPUT) + self.assertIs(fake_timer.saved_timer, time.clock) + + def test_main_verbose(self): + s = self.run_main(switches=['-v']) + self.assertEqual(s, dedent("""\ + 10 loops -> 10 secs + raw times: 10 10 10 + 10 loops, best of 3: 1 sec per loop + """)) + + def test_main_very_verbose(self): + s = self.run_main(seconds_per_increment=0.000050, switches=['-vv']) + self.assertEqual(s, dedent("""\ + 10 loops -> 0.0005 secs + 100 loops -> 0.005 secs + 1000 loops -> 0.05 secs + 10000 loops -> 0.5 secs + raw times: 0.5 0.5 0.5 + 10000 loops, best of 3: 50 usec per loop + """)) + + def test_main_exception(self): + with captured_stderr() as error_stringio: + s = self.run_main(switches=['1/0']) + self.assert_exc_string(error_stringio.getvalue(), 'ZeroDivisionError') + + def test_main_exception_fixed_reps(self): + with captured_stderr() as error_stringio: + s = self.run_main(switches=['-n1', '1/0']) + self.assert_exc_string(error_stringio.getvalue(), 'ZeroDivisionError') + + +def test_main(): + run_unittest(TestTimeit) + +if __name__ == '__main__': + test_main() |