diff --git a/Cargo.lock b/Cargo.lock
index 1b34d10..1379c12 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -7401,6 +7401,7 @@ dependencies = [
  "sp-core",
  "sp-genesis-builder",
  "sp-inherents",
+ "sp-io",
  "sp-offchain",
  "sp-runtime",
  "sp-session",
diff --git a/runtime/Cargo.toml b/runtime/Cargo.toml
index d5501d4..58798cd 100644
--- a/runtime/Cargo.toml
+++ b/runtime/Cargo.toml
@@ -82,6 +82,9 @@ cumulus-primitives-utility = { git = "https://github.com/paritytech/polkadot-sdk
 pallet-collator-selection = { git = "https://github.com/paritytech/polkadot-sdk", branch = "release-polkadot-v1.3.0", default-features = false }
 parachain-info = { git = "https://github.com/paritytech/polkadot-sdk", branch = "release-polkadot-v1.3.0", default-features = false }
 
+[dev-dependencies]
+sp-io = { git = "https://github.com/paritytech/polkadot-sdk", branch = "release-polkadot-v1.3.0" }
+
 [features]
 default = ["std"]
 std = [
diff --git a/runtime/tests/common/mod.rs b/runtime/tests/common/mod.rs
new file mode 100644
index 0000000..a5f4fe8
--- /dev/null
+++ b/runtime/tests/common/mod.rs
@@ -0,0 +1,12 @@
+// ExtBuilder impl for all runtime integration tests
+use frame_support::weights::Weight;
+use parachain_template_runtime::{BuildStorage, Runtime, System};
+
+pub fn run_with_system_weight<F: FnMut()>(w: Weight, mut assertions: F) {
+    let mut t: sp_io::TestExternalities =
+        frame_system::GenesisConfig::<Runtime>::default().build_storage().unwrap().into();
+    t.execute_with(|| {
+        System::set_block_consumed_resources(w, 0);
+        assertions()
+    });
+}
diff --git a/runtime/tests/multiplier.rs b/runtime/tests/multiplier.rs
new file mode 100644
index 0000000..bd5e9a8
--- /dev/null
+++ b/runtime/tests/multiplier.rs
@@ -0,0 +1,46 @@
+// Integration transaction weight-fee tests
+mod common;
+use common::*;
+use frame_support::pallet_prelude::*;
+use pallet_transaction_payment::Multiplier;
+use parachain_template_runtime::{Runtime, RuntimeBlockWeights};
+use polkadot_runtime_common::MinimumMultiplier;
+use sp_runtime::{traits::Convert, Perquintill};
+
+fn min_multiplier() -> Multiplier {
+    MinimumMultiplier::get()
+}
+
+fn target() -> Weight {
+    Perquintill::from_percent(25)
+        * RuntimeBlockWeights::get().get(DispatchClass::Normal).max_total.unwrap()
+}
+
+fn runtime_multiplier_update(fm: Multiplier) -> Multiplier {
+    <Runtime as pallet_transaction_payment::Config>::FeeMultiplierUpdate::convert(fm)
+}
+
+#[test]
+fn multiplier_can_grow_from_zero() {
+    // if the min is too small, then this will not change, and we are doomed forever.
+    // the block ref time is 1/100th bigger than target.
+    run_with_system_weight(target().set_ref_time(target().ref_time() * 101 / 100), || {
+        let next = runtime_multiplier_update(min_multiplier());
+        assert!(next > min_multiplier(), "{:?} !> {:?}", next, min_multiplier());
+    });
+
+    // the block proof size is 1/100th bigger than target.
+    run_with_system_weight(target().set_proof_size((target().proof_size() / 100) * 101), || {
+        let next = runtime_multiplier_update(min_multiplier());
+        assert!(next > min_multiplier(), "{:?} !> {:?}", next, min_multiplier());
+    })
+}
+
+#[test]
+fn multiplier_cannot_go_below_limit() {
+    // will not go any further below even if block is empty.
+    run_with_system_weight(Weight::zero(), || {
+        let next = runtime_multiplier_update(min_multiplier());
+        assert_eq!(next, min_multiplier());
+    })
+}
diff --git a/runtime/tests/storage.rs b/runtime/tests/storage.rs
new file mode 100644
index 0000000..24ec4f5
--- /dev/null
+++ b/runtime/tests/storage.rs
@@ -0,0 +1,34 @@
+// Storage indices integration checks
+use frame_support::traits::PalletInfo;
+use parachain_template_runtime::{
+    Aura, AuraExt, Authorship, Balances, CollatorSelection, CumulusXcm, DmpQueue, Multisig,
+    ParachainInfo, ParachainSystem, PolkadotXcm, Proxy, Runtime, Session, Sudo, System,
+    TemplatePallet, Timestamp, TransactionPayment, XcmpQueue,
+};
+
+fn assert_pallet_prefix<P: 'static>(name: &str) {
+    assert_eq!(<Runtime as frame_system::Config>::PalletInfo::name::<P>(), Some(name));
+}
+
+#[test]
+fn verify_pallet_prefixes() {
+    assert_pallet_prefix::<System>("System");
+    assert_pallet_prefix::<ParachainSystem>("ParachainSystem");
+    assert_pallet_prefix::<Timestamp>("Timestamp");
+    assert_pallet_prefix::<ParachainInfo>("ParachainInfo");
+    assert_pallet_prefix::<Proxy>("Proxy");
+    assert_pallet_prefix::<Balances>("Balances");
+    assert_pallet_prefix::<TransactionPayment>("TransactionPayment");
+    assert_pallet_prefix::<Sudo>("Sudo");
+    assert_pallet_prefix::<Multisig>("Multisig");
+    assert_pallet_prefix::<Authorship>("Authorship");
+    assert_pallet_prefix::<CollatorSelection>("CollatorSelection");
+    assert_pallet_prefix::<Session>("Session");
+    assert_pallet_prefix::<Aura>("Aura");
+    assert_pallet_prefix::<AuraExt>("AuraExt");
+    assert_pallet_prefix::<XcmpQueue>("XcmpQueue");
+    assert_pallet_prefix::<PolkadotXcm>("PolkadotXcm");
+    assert_pallet_prefix::<CumulusXcm>("CumulusXcm");
+    assert_pallet_prefix::<DmpQueue>("DmpQueue");
+    assert_pallet_prefix::<TemplatePallet>("TemplatePallet");
+}