Function substrate_test_client::client::new_with_backend

pub fn new_with_backend<B, E, Block, S, RA>(
    backend: Arc<B>, 
    executor: E, 
    build_genesis_storage: &S, 
    keystore: Option<Arc<dyn SyncCryptoStore + 'static>>, 
    spawn_handle: Box<dyn SpawnNamed + 'static, Global>, 
    prometheus_registry: Option<Registry>, 
    telemetry: Option<TelemetryHandle>, 
    config: ClientConfig<Block>
) -> Result<Client<B, LocalCallExecutor<Block, B, E>, Block, RA>, Error> where
    Block: Block,
    E: CodeExecutor + RuntimeVersionOf,
    B: LocalBackend<Block> + 'static,
    S: BuildStorage, 

Create a client with the explicitly provided backend. This is useful for testing backend implementations.