init

runtime/tests/fee.rs

@@ -0,0 +1,22 @@
+// Integration transaction fee tests i.e. adjusts to block saturation
+mod common;
+use common::*;
+use frame_support::pallet_prelude::*;
+use parachain_template_runtime::{Runtime, RuntimeBlockWeights};
+use polkadot_runtime_common::MinimumMultiplier;
+use sp_runtime::{traits::Convert, Perquintill};
+
+#[test]
+fn multiplier_can_grow_from_zero() {
+    let minimum_multiplier = MinimumMultiplier::get();
+    let target = Perquintill::from_percent(25)
+        * RuntimeBlockWeights::get().get(DispatchClass::Normal).max_total.unwrap();
+    // if the min is too small, then this will not change, and we are doomed forever.
+    // the weight is 1/100th bigger than target.
+    run_with_system_weight(target * 101 / 100, || {
+        let next = <Runtime as pallet_transaction_payment::Config>::FeeMultiplierUpdate::convert(
+            minimum_multiplier,
+        );
+        assert!(next > minimum_multiplier, "{:?} !>= {:?}", next, minimum_multiplier);
+    })
+}