def ndarray_store_with_uncompressed_write(mongo_server):
    """
    The database state created by this fixture is equivalent to the following operations using arctic 1.40
    or previous:

        arctic.initialize_library('arctic_test.TEST', m.VERSION_STORE, segment='month')
        library = arctic.get_library('arctic_test.TEST')
        arr = np.arange(2).astype([('abc', 'int64')])
        library.write('MYARR', arr[:1])
        library.write('MYARR', arr)

    different from newer versions, the last write creates a uncompressed chunk.
    """
    mongo_server.api.drop_database('arctic_test')

    library_name = 'arctic_test.TEST'
    arctic = m.Arctic(mongo_host=mongo_server.api)
    arctic.initialize_library(library_name, m.VERSION_STORE, segment='month')

    db = mongo_server.api.arctic_test
    db.TEST.insert_many([
        {
            "_id": bson.ObjectId("5ad0742ca0949de6727cf994"),
            "segment": 0,
            "sha": bson.Binary(base64.b64decode("Fk+quqPVSDfaajYJkOAvnDyXtGQ="), 0),
            "symbol": "MYARR",
            "data": bson.Binary(base64.b64decode("CAAAAIAAAAAAAAAAAA=="), 0),
            "compressed": True,
            "parent": [bson.ObjectId("5ad0742c5c911d4d80ee2ea3")]
        },
        {
            "_id": bson.ObjectId("5ad0742ca0949de6727cf995"),
            "sha": bson.Binary(base64.b64decode("eqpp8VOJBttTz0j5H+QGtOQ+r44="), 0),
            "symbol": "MYARR",
            "segment": 1,
            "data": bson.Binary(base64.b64decode("AQAAAAAAAAA="), 0),
            "compressed": False,
            "parent": [bson.ObjectId("5ad0742c5c911d4d80ee2ea3")]
        }
    ])
    db.TEST.ARCTIC.update_one({"_id": "ARCTIC_META"}, {"$set": {"_id": "ARCTIC_META", "TYPE": "VersionStore", "QUOTA": 10737418240}})
    db.TEST.versions_nums.insert_one({"_id": bson.ObjectId("5ad0742ca0949de6727cf993"), "symbol": "MYARR", "version": 2})
    db.TEST.versions.insert_many([
        {
            "_id": bson.ObjectId("5ad0742c5c911d4d80ee2ea3"),
            "append_count": 0,
            "dtype_metadata": {},
            "segment_count": 1,
            "dtype": "[('abc', '<i8')]",
            "symbol": "MYARR",
            "up_to": 1,
            "append_size": 0,
            "sha": bson.Binary(base64.b64decode("Bf5AV1MWbxJVWefJrFWGVPEHx+k="), 0),
            "shape": [-1],
            "version": 1,
            "base_sha": bson.Binary(base64.b64decode("Bf5AV1MWbxJVWefJrFWGVPEHx+k="), 0),
            "type": "ndarray",
            "metadata": None
        },
        {
            "_id": bson.ObjectId("5ad0742c5c911d4d80ee2ea4"),
            "append_count": 1,
            "dtype_metadata": {},
            "segment_count": 2,
            "base_version_id": bson.ObjectId("5ad0742c5c911d4d80ee2ea3"),
            "dtype": "[('abc', '<i8')]",
            "symbol": "MYARR",
            "up_to": 2,
            "append_size": 8,
            "sha": bson.Binary(base64.b64decode("Ax7oBxVFw1/9wKog2gfOLjbOVD8="), 0),
            "shape": [-1],
            "version": 2,
            "base_sha": bson.Binary(base64.b64decode("Bf5AV1MWbxJVWefJrFWGVPEHx+k="), 0),
            "type": "ndarray",
            "metadata": None
        }
    ])

    return {'symbol': 'MYARR', 'store': arctic.get_library('arctic_test.TEST')}