benchmarks: account existential deposit in author mapping benchmarks

pallets/author-mapping/Cargo.toml

@@ -18,6 +18,7 @@ serde = { workspace = true, optional = true }
 frame-benchmarking = { workspace = true, optional = true }
 frame-support = { workspace = true }
 frame-system = { workspace = true }
+pallet-balances = { workspace = true, optional = true }
 parity-scale-codec = { workspace = true, features = [ "derive" ] }
 scale-info = { workspace = true, features = [ "derive" ] }
 sp-runtime = { workspace = true }
@@ -27,7 +28,6 @@ sp-std = { workspace = true }
 session-keys-primitives = { workspace = true }
 
 [dev-dependencies]
-pallet-balances = { workspace = true, features = ["std"] }
 sp-core = { workspace = true }
 sp-io = { workspace = true }
 
@@ -45,9 +45,11 @@ std = [
 	"session-keys-primitives/std",
 	"sp-runtime/std",
 	"sp-std/std",
+	"pallet-balances/std"
 ]
 runtime-benchmarks = [
 	"frame-benchmarking",
+	"pallet-balances",
 	"session-keys-primitives/runtime-benchmarks",
 ]
 try-runtime = [ "frame-support/try-runtime" ]

pallets/author-mapping/src/benchmarks.rs

@@ -28,13 +28,14 @@ use nimbus_primitives::NimbusId;
 use parity_scale_codec::Decode;
 
 /// Create a funded user.
-fn create_funded_user<T: Config>() -> T::AccountId {
+fn create_funded_user<T: Config + pallet_balances::Config<Balance = BalanceOf<T>>>() -> T::AccountId
+{
 	let user = account("account id", 0u32, 0u32);
-	T::DepositCurrency::make_free_balance_be(
-		&user,
-		<<T as Config>::DepositAmount as Get<BalanceOf<T>>>::get(),
-	);
-	T::DepositCurrency::issue(<<T as Config>::DepositAmount as Get<BalanceOf<T>>>::get());
+	let existential_deposit = <T as pallet_balances::Config>::ExistentialDeposit::get();
+	let amount = existential_deposit + <<T as Config>::DepositAmount as Get<BalanceOf<T>>>::get();
+
+	T::DepositCurrency::make_free_balance_be(&user, amount);
+	T::DepositCurrency::issue(amount);
 	user
 }
 
@@ -45,6 +46,8 @@ pub fn nimbus_id(seed: u8) -> NimbusId {
 }
 
 benchmarks! {
+	where_clause { where T: pallet_balances::Config<Balance = BalanceOf<T>> }
+
 	add_association {
 		let caller = create_funded_user::<T>();
 		let id = nimbus_id(1u8);