provisioner tests: remove tokio from dev-dependencies (#1745)

* provisioner: remove tokio from dev-dependencies

* provisioner: use futures_timer instead

polkadot/Cargo.lock

@@ -4965,13 +4965,13 @@ dependencies = [
  "bitvec",
  "derive_more 0.99.9",
  "futures 0.3.5",
+ "futures-timer 3.0.2",
  "lazy_static",
  "log 0.4.11",
  "polkadot-node-subsystem",
  "polkadot-node-subsystem-util",
  "polkadot-primitives",
  "sp-core",
- "tokio 0.2.21",
 ]
 
 [[package]]

polkadot/node/core/provisioner/Cargo.toml

@@ -16,4 +16,4 @@ polkadot-node-subsystem-util = { path = "../../subsystem-util" }
 [dev-dependencies]
 lazy_static = "1.4"
 sp-core = { git = "https://github.com/paritytech/substrate", branch = "master" }
-tokio = "0.2"
+futures-timer = "3.0.2"

polkadot/node/core/provisioner/src/lib.rs

@@ -648,6 +648,7 @@ mod tests {
 	}
 
 	mod select_candidates {
+		use futures_timer::Delay;
 		use super::super::*;
 		use super::{build_occupied_core, default_bitvec, occupied_core, scheduled_core};
 		use polkadot_node_subsystem::messages::RuntimeApiRequest::{
@@ -675,9 +676,7 @@ mod tests {
 
 			futures::pin_mut!(overseer, test);
 
-			tokio::runtime::Runtime::new()
+			futures::executor::block_on(future::select(overseer, test));
-				.unwrap()
-				.block_on(future::select(overseer, test));
 		}
 
 		// For test purposes, we always return this set of availability cores:
@@ -784,12 +783,12 @@ mod tests {
 				// drop the receiver so it closes and the sender can't send, then just sleep long enough that
 				// this is almost certainly not the first of the two futures to complete
 				std::mem::drop(rx);
-				tokio::time::delay_for(std::time::Duration::from_secs(1)).await;
+				Delay::new(std::time::Duration::from_secs(1)).await;
 			};
 
 			let test = |mut tx: mpsc::Sender<FromJob>| async move {
 				// wait so that the overseer can drop the rx before we attempt to send
-				tokio::time::delay_for(std::time::Duration::from_millis(50)).await;
+				Delay::new(std::time::Duration::from_millis(50)).await;
 				let result = select_candidates(&[], &[], &[], Default::default(), &mut tx).await;
 				println!("{:?}", result);
 				assert!(std::matches!(result, Err(Error::OneshotSend)));