add AsyncBackend storage tests

Author: OBorce

Cargo.lock

@@ -242,6 +242,7 @@ tokio = { version = "1.27", default-features = false }
 tokio-socks = "0.5"
 tokio-stream = "0.1"
 tokio-util = { version = "0.7", default-features = false }
+tokio-test = "0.4"
 toml = "0.8"
 tower = "0.4"
 tower-http-axum = { package = "tower-http", version = "0.5" }

Cargo.toml

@@ -16,6 +16,12 @@ utils = { path = "../../utils" }
 libtest-mimic.workspace = true
 parity-scale-codec.workspace = true
 proptest.workspace = true
+tokio = { workspace = true, default-features = false, features = [
+  "macros",
+  "rt",
+  "rt-multi-thread",
+] }
+tokio-test.workspace = true
 
 [lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(loom)'] }