Qt.git - Qt s a cross-platform application framework that is used for developing application software that can be run on various software and hardware platforms with little or no change in the underlying codebase, while still being a native application with native capabilities and speed.

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author	Bea Lam <bea.lam@nokia.com>	2010-05-12 01:33:56 (GMT)
committer	Bea Lam <bea.lam@nokia.com>	2010-05-12 01:35:06 (GMT)
commit	855368e447a1db8f72c1ad135b9edfb9c373a01d (patch)
tree	067fb4ed5b644f71ba1d1db00d12057dcfacfef3 /doc/src/snippets/sqldatabase
parent	a19df56265e59bb26f927638aa5c75ccd666c388 (diff)
download	Qt-855368e447a1db8f72c1ad135b9edfb9c373a01d.zip Qt-855368e447a1db8f72c1ad135b9edfb9c373a01d.tar.gz Qt-855368e447a1db8f72c1ad135b9edfb9c373a01d.tar.bz2

Qt.widgets was removed, point to graphics layouts example

Diffstat (limited to 'doc/src/snippets/sqldatabase')

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"""Unit tests for contextlib.py, and other context managers."""

import sys
import tempfile
import unittest
from contextlib import *  # Tests __all__
from test import test_support
try:
    import threading
except ImportError:
    threading = None


class ContextManagerTestCase(unittest.TestCase):

    def test_contextmanager_plain(self):
        state = []
        @contextmanager
        def woohoo():
            state.append(1)
            yield 42
            state.append(999)
        with woohoo() as x:
            self.assertEqual(state, [1])
            self.assertEqual(x, 42)
            state.append(x)
        self.assertEqual(state, [1, 42, 999])

    def test_contextmanager_finally(self):
        state = []
        @contextmanager
        def woohoo():
            state.append(1)
            try:
                yield 42
            finally:
                state.append(999)
        with self.assertRaises(ZeroDivisionError):
            with woohoo() as x:
                self.assertEqual(state, [1])
                self.assertEqual(x, 42)
                state.append(x)
                raise ZeroDivisionError()
        self.assertEqual(state, [1, 42, 999])

    def test_contextmanager_no_reraise(self):
        @contextmanager
        def whee():
            yield
        ctx = whee()
        ctx.__enter__()
        # Calling __exit__ should not result in an exception
        self.assertFalse(ctx.__exit__(TypeError, TypeError("foo"), None))

    def test_contextmanager_trap_yield_after_throw(self):
        @contextmanager
        def whoo():
            try:
                yield
            except:
                yield
        ctx = whoo()
        ctx.__enter__()
        self.assertRaises(
            RuntimeError, ctx.__exit__, TypeError, TypeError("foo"), None
        )

    def test_contextmanager_except(self):
        state = []
        @contextmanager
        def woohoo():
            state.append(1)
            try:
                yield 42
            except ZeroDivisionError, e:
                state.append(e.args[0])
                self.assertEqual(state, [1, 42, 999])
        with woohoo() as x:
            self.assertEqual(state, [1])
            self.assertEqual(x, 42)
            state.append(x)
            raise ZeroDivisionError(999)
        self.assertEqual(state, [1, 42, 999])

    def _create_contextmanager_attribs(self):
        def attribs(**kw):
            def decorate(func):
                for k,v in kw.items():
                    setattr(func,k,v)
                return func
            return decorate
        @contextmanager
        @attribs(foo='bar')
        def baz(spam):
            """Whee!"""
        return baz

    def test_contextmanager_attribs(self):
        baz = self._create_contextmanager_attribs()
        self.assertEqual(baz.__name__,'baz')
        self.assertEqual(baz.foo, 'bar')

    @unittest.skipIf(sys.flags.optimize >= 2,
                     "Docstrings are omitted with -O2 and above")
    def test_contextmanager_doc_attrib(self):
        baz = self._create_contextmanager_attribs()
        self.assertEqual(baz.__doc__, "Whee!")

class NestedTestCase(unittest.TestCase):

    # XXX This needs more work

    def test_nested(self):
        @contextmanager
        def a():
            yield 1
        @contextmanager
        def b():
            yield 2
        @contextmanager
        def c():
            yield 3
        with nested(a(), b(), c()) as (x, y, z):
            self.assertEqual(x, 1)
            self.assertEqual(y, 2)
            self.assertEqual(z, 3)

    def test_nested_cleanup(self):
        state = []
        @contextmanager
        def a():
            state.append(1)
            try:
                yield 2
            finally:
                state.append(3)
        @contextmanager
        def b():
            state.append(4)
            try:
                yield 5
            finally:
                state.append(6)
        with self.assertRaises(ZeroDivisionError):
            with nested(a(), b()) as (x, y):
                state.append(x)
                state.append(y)
                1 // 0
        self.assertEqual(state, [1, 4, 2, 5, 6, 3])

    def test_nested_right_exception(self):
        @contextmanager
        def a():
            yield 1
        class b(object):
            def __enter__(self):
                return 2
            def __exit__(self, *exc_info):
                try:
                    raise Exception()
                except:
                    pass
        with self.assertRaises(ZeroDivisionError):
            with nested(a(), b()) as (x, y):
                1 // 0
        self.assertEqual((x, y), (1, 2))

    def test_nested_b_swallows(self):
        @contextmanager
        def a():
            yield
        @contextmanager
        def b():
            try:
                yield
            except:
                # Swallow the exception
                pass
        try:
            with nested(a(), b()):
                1 // 0
        except ZeroDivisionError:
            self.fail("Didn't swallow ZeroDivisionError")

    def test_nested_break(self):
        @contextmanager
        def a():
            yield
        state = 0
        while True:
            state += 1
            with nested(a(), a()):
                break
            state += 10
        self.assertEqual(state, 1)

    def test_nested_continue(self):
        @contextmanager
        def a():
            yield
        state = 0
        while state < 3:
            state += 1
            with nested(a(), a()):
                continue
            state += 10
        self.assertEqual(state, 3)

    def test_nested_return(self):
        @contextmanager
        def a():
            try:
                yield
            except:
                pass
        def foo():
            with nested(a(), a()):
                return 1
            return 10
        self.assertEqual(foo(), 1)

class ClosingTestCase(unittest.TestCase):

    # XXX This needs more work

    def test_closing(self):
        state = []
        class C:
            def close(self):
                state.append(1)
        x = C()
        self.assertEqual(state, [])
        with closing(x) as y:
            self.assertEqual(x, y)
        self.assertEqual(state, [1])

    def test_closing_error(self):
        state = []
        class C:
            def close(self):
                state.append(1)
        x = C()
        self.assertEqual(state, [])
        with self.assertRaises(ZeroDivisionError):
            with closing(x) as y:
                self.assertEqual(x, y)
                1 // 0
        self.assertEqual(state, [1])

class FileContextTestCase(unittest.TestCase):

    def testWithOpen(self):
        tfn = tempfile.mktemp()
        try:
            f = None
            with open(tfn, "w") as f:
                self.assertFalse(f.closed)
                f.write("Booh\n")
            self.assertTrue(f.closed)
            f = None
            with self.assertRaises(ZeroDivisionError):
                with open(tfn, "r") as f:
                    self.assertFalse(f.closed)
                    self.assertEqual(f.read(), "Booh\n")
                    1 // 0
            self.assertTrue(f.closed)
        finally:
            test_support.unlink(tfn)

@unittest.skipUnless(threading, 'Threading required for this test.')
class LockContextTestCase(unittest.TestCase):

    def boilerPlate(self, lock, locked):
        self.assertFalse(locked())
        with lock:
            self.assertTrue(locked())
        self.assertFalse(locked())
        with self.assertRaises(ZeroDivisionError):
            with lock:
                self.assertTrue(locked())
                1 // 0
        self.assertFalse(locked())

    def testWithLock(self):
        lock = threading.Lock()
        self.boilerPlate(lock, lock.locked)

    def testWithRLock(self):
        lock = threading.RLock()
        self.boilerPlate(lock, lock._is_owned)

    def testWithCondition(self):
        lock = threading.Condition()
        def locked():
            return lock._is_owned()
        self.boilerPlate(lock, locked)

    def testWithSemaphore(self):
        lock = threading.Semaphore()
        def locked():
            if lock.acquire(False):
                lock.release()
                return False
            else:
                return True
        self.boilerPlate(lock, locked)

    def testWithBoundedSemaphore(self):
        lock = threading.BoundedSemaphore()
        def locked():
            if lock.acquire(False):
                lock.release()
                return False
            else:
                return True
        self.boilerPlate(lock, locked)

# This is needed to make the test actually run under regrtest.py!
def test_main():
    with test_support.check_warnings(("With-statements now directly support "
                                      "multiple context managers",
                                      DeprecationWarning)):
        test_support.run_unittest(__name__)

if __name__ == "__main__":
    test_main()


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