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import sys
import unittest

from webkitpy.common.system import stack_utils


def current_thread_id():
    for thread_id in sys._current_frames().keys():
        return thread_id
    return None


class StackUtilsTest(unittest.TestCase):
    def test_find_thread_stack_found(self):
        thread_id = current_thread_id()
        found_stack = stack_utils._find_thread_stack(thread_id)
        self.assertIsNotNone(found_stack)

    def test_find_thread_stack_not_found(self):
        found_stack = stack_utils._find_thread_stack(0)
        self.assertIsNone(found_stack)

    def test_log_thread_state(self):
        msgs = []

        def logger(msg):
            msgs.append(msg)

        thread_id = current_thread_id()
        stack_utils.log_thread_state(logger, "test-thread", thread_id,
                                     "is tested")
        self.assertTrue(msgs)

    def test_log_traceback(self):
        msgs = []

        def logger(msg):
            msgs.append(msg)

        try:
            raise ValueError
        except:
            stack_utils.log_traceback(logger, sys.exc_info()[2])
        self.assertTrue(msgs)