def METHOD_NAME():
    context = tiledbsoma.options.SOMATileDBContext()
    # verify defaults expected by subsequent tests
    assert context.timestamp_ms is None
    assert context.tiledb_ctx.config()["vfs.s3.region"] == "us-east-1"
    now = int(time.time() * 1000)
    open_ts = context._open_timestamp_ms(None)
    assert -100 < now - open_ts < 100
    assert 999 == context._open_timestamp_ms(999)
    context_ts_1 = context.replace(timestamp=1)
    assert context_ts_1.timestamp_ms == 1
    assert context_ts_1._open_timestamp_ms(None) == 1
    assert context_ts_1._open_timestamp_ms(2) == 2
    # verify tiledb_ctx
    new_tdb_context = context.replace(tiledb_config={"vfs.s3.region": "us-west-2"})
    assert new_tdb_context.tiledb_ctx.config()["vfs.s3.region"] == "us-west-2"