How to use the motor.motor_asyncio.AsyncIOMotorGridOut function in motor

def test_gridfs_find(self):
        yield from self.fs.put(b"test2", filename="two")
        yield from self.fs.put(b"test2+", filename="two")
        yield from self.fs.put(b"test1", filename="one")
        yield from self.fs.put(b"test2++", filename="two")
        cursor = self.fs.find().sort("_id", -1).skip(1).limit(2)
        self.assertTrue((yield from cursor.fetch_next))
        grid_out = cursor.next_object()
        self.assertTrue(isinstance(grid_out, AsyncIOMotorGridOut))
        self.assertEqual(b"test1", (yield from grid_out.read()))
        self.assertRaises(TypeError, self.fs.find, {}, {"_id": True})

def test_grid_out_custom_opts(self):
        one = AsyncIOMotorGridIn(
            self.db.fs, _id=5, filename="my_file",
            contentType="text/html", chunkSize=1000, aliases=["foo"],
            metadata={"foo": 1, "bar": 2}, bar=3, baz="hello")

        yield from one.write(b"hello world")
        yield from one.close()

        two = yield from AsyncIOMotorGridOut(self.db.fs, 5).open()

        self.assertEqual(5, two._id)
        self.assertEqual(11, two.length)
        self.assertEqual("text/html", two.content_type)
        self.assertEqual(1000, two.chunk_size)
        self.assertTrue(isinstance(two.upload_date, datetime.datetime))
        self.assertEqual(["foo"], two.aliases)
        self.assertEqual({"foo": 1, "bar": 2}, two.metadata)
        self.assertEqual(3, two.bar)
        self.assertEqual("5eb63bbbe01eeed093cb22bb8f5acdc3", two.md5)

def test_grid_out_file_document(self):
        one = AsyncIOMotorGridIn(self.db.fs)
        yield from one.write(b"foo bar")
        yield from one.close()

        file_document = yield from self.db.fs.files.find_one()
        two = AsyncIOMotorGridOut(
            self.db.fs, file_document=file_document)

        self.assertEqual(b"foo bar", (yield from two.read()))

        file_document = yield from self.db.fs.files.find_one()
        three = AsyncIOMotorGridOut(self.db.fs, 5, file_document)
        self.assertEqual(b"foo bar", (yield from three.read()))

        gridout = AsyncIOMotorGridOut(self.db.fs, file_document={})
        with self.assertRaises(NoFile):
            yield from gridout.open()

def test_grid_out_default_opts(self):
        self.assertRaises(TypeError, AsyncIOMotorGridOut, "foo")
        gout = AsyncIOMotorGridOut(self.db.fs, 5)
        with self.assertRaises(NoFile):
            yield from gout.open()

        a = AsyncIOMotorGridIn(self.db.fs)
        yield from a.close()

        b = yield from AsyncIOMotorGridOut(self.db.fs, a._id).open()

        self.assertEqual(a._id, b._id)
        self.assertEqual(0, b.length)
        self.assertEqual(None, b.content_type)
        self.assertEqual(255 * 1024, b.chunk_size)
        self.assertTrue(isinstance(b.upload_date, datetime.datetime))
        self.assertEqual(None, b.aliases)
        self.assertEqual(None, b.metadata)
        self.assertEqual("d41d8cd98f00b204e9800998ecf8427e", b.md5)

def test_gridout_open_exc_info(self):
        g = AsyncIOMotorGridOut(self.db.fs, "_id that doesn't exist")
        try:
            yield from g.open()
        except NoFile:
            _, _, tb = sys.exc_info()
            # The call tree should include PyMongo code we ran on a thread.
            formatted = '\n'.join(traceback.format_tb(tb))
            self.assertTrue('_ensure_file' in formatted)

def test_alternate_collection(self):
        yield from self.db.alt.files.delete_many({})
        yield from self.db.alt.chunks.delete_many({})

        f = AsyncIOMotorGridIn(self.db.alt)
        yield from f.write(b"hello world")
        yield from f.close()

        self.assertEqual(1, (yield from self.db.alt.files.count_documents({})))
        self.assertEqual(1, (yield from self.db.alt.chunks.count_documents({})))

        g = AsyncIOMotorGridOut(self.db.alt, f._id)
        self.assertEqual(b"hello world", (yield from g.read()))

        # test that md5 still works...
        self.assertEqual("5eb63bbbe01eeed093cb22bb8f5acdc3", g.md5)

def test_grid_out_default_opts(self):
        self.assertRaises(TypeError, AsyncIOMotorGridOut, "foo")
        gout = AsyncIOMotorGridOut(self.db.fs, 5)
        with self.assertRaises(NoFile):
            yield from gout.open()

        a = AsyncIOMotorGridIn(self.db.fs)
        yield from a.close()

        b = yield from AsyncIOMotorGridOut(self.db.fs, a._id).open()

        self.assertEqual(a._id, b._id)
        self.assertEqual(0, b.length)
        self.assertEqual(None, b.content_type)
        self.assertEqual(255 * 1024, b.chunk_size)
        self.assertTrue(isinstance(b.upload_date, datetime.datetime))
        self.assertEqual(None, b.aliases)
        self.assertEqual(None, b.metadata)
        self.assertEqual("d41d8cd98f00b204e9800998ecf8427e", b.md5)

self.assertEqual(5, f.baz)
        self.assertRaises(AttributeError, getattr, f, "uploadDate")

        yield from f.close()

        self.assertEqual("foo", f._id)
        self.assertEqual("foo", f.bar)
        self.assertEqual(5, f.baz)
        self.assertTrue(f.uploadDate)

        self.assertRaises(AttributeError, setattr, f, "_id", 5)
        yield from f.set("bar", "a")
        yield from f.set("baz", "b")
        self.assertRaises(AttributeError, setattr, f, "upload_date", 5)

        g = yield from AsyncIOMotorGridOut(self.db.fs, f._id).open()
        self.assertEqual("a", g.bar)
        self.assertEqual("b", g.baz)

def test_write_file_like(self):
        one = AsyncIOMotorGridIn(self.db.fs)
        yield from one.write(b"hello world")
        yield from one.close()

        two = AsyncIOMotorGridOut(self.db.fs, one._id)
        three = AsyncIOMotorGridIn(self.db.fs)
        yield from three.write(two)
        yield from three.close()

        four = AsyncIOMotorGridOut(self.db.fs, three._id)
        self.assertEqual(b"hello world", (yield from four.read()))

def test_attributes(self):
        f = AsyncIOMotorGridIn(
            self.db.fs,
            filename="test",
            foo="bar",
            content_type="text")

        yield from f.close()

        g = AsyncIOMotorGridOut(self.db.fs, f._id)
        attr_names = (
            '_id',
            'filename',
            'name',
            'name',
            'content_type',
            'length',
            'chunk_size',
            'upload_date',
            'aliases',
            'metadata',
            'md5')

        for attr_name in attr_names:
            self.assertRaises(InvalidOperation, getattr, g, attr_name)