diff --git a/substrate/Cargo.lock b/substrate/Cargo.lock
index bf790171aa..8d5dd6ba47 100644
--- a/substrate/Cargo.lock
+++ b/substrate/Cargo.lock
@@ -3859,6 +3859,7 @@ dependencies = [
  "srml-support 0.1.0",
  "substrate-client 0.1.0",
  "substrate-consensus-aura-primitives 0.1.0",
+ "substrate-executor 0.1.0",
  "substrate-keyring 0.1.0",
  "substrate-primitives 0.1.0",
 ]
diff --git a/substrate/core/test-runtime/Cargo.toml b/substrate/core/test-runtime/Cargo.toml
index d43cb5d0cf..49389a0b51 100644
--- a/substrate/core/test-runtime/Cargo.toml
+++ b/substrate/core/test-runtime/Cargo.toml
@@ -20,6 +20,9 @@ sr-primitives = { path = "../sr-primitives", default-features = false }
 sr-version = { path = "../sr-version", default-features = false }
 srml-support = { path = "../../srml/support", default-features = false }
 
+[dev-dependencies]
+substrate-executor = { path = "../executor" }
+
 [features]
 default = ["std"]
 std = [
diff --git a/substrate/core/test-runtime/src/lib.rs b/substrate/core/test-runtime/src/lib.rs
index 8aafd99791..eb5efdf684 100644
--- a/substrate/core/test-runtime/src/lib.rs
+++ b/substrate/core/test-runtime/src/lib.rs
@@ -45,6 +45,8 @@ extern crate substrate_keyring as keyring;
 #[cfg_attr(any(feature = "std", test), macro_use)]
 extern crate substrate_primitives as primitives;
 
+#[cfg(test)] extern crate substrate_executor;
+
 #[cfg(feature = "std")] pub mod genesismap;
 pub mod system;
 
diff --git a/substrate/core/test-runtime/src/system.rs b/substrate/core/test-runtime/src/system.rs
index 81cbabe906..19739b21cb 100644
--- a/substrate/core/test-runtime/src/system.rs
+++ b/substrate/core/test-runtime/src/system.rs
@@ -248,6 +248,10 @@ mod tests {
 	use ::{Header, Digest, Extrinsic, Transfer};
 	use primitives::{Blake2Hasher};
 	use primitives::storage::well_known_keys;
+	use substrate_executor::WasmExecutor;
+
+	const WASM_CODE: &'static [u8] =
+			include_bytes!("../wasm/target/wasm32-unknown-unknown/release/substrate_test_runtime.compact.wasm");
 
 	fn new_test_ext() -> TestExternalities<Blake2Hasher> {
 		TestExternalities::new(map![
@@ -265,8 +269,7 @@ mod tests {
 		Extrinsic { transfer: tx, signature }
 	}
 
-	#[test]
-	fn block_import_works() {
+	fn block_import_works<F>(block_executor: F) where F: Fn(Block, &mut TestExternalities<Blake2Hasher>) {
 		let mut t = new_test_ext();
 
 		let h = Header {
@@ -282,13 +285,27 @@ mod tests {
 			extrinsics: vec![],
 		};
 
-		with_externalities(&mut t, || {
-			execute_block(b);
+		block_executor(b, &mut t);
+
+	}
+
+	#[test]
+	fn block_import_works_native() {
+		block_import_works(|b, ext| {
+			with_externalities(ext, || {
+				execute_block(b);
+			});
 		});
 	}
 
 	#[test]
-	fn block_import_with_transaction_works() {
+	fn block_import_works_wasm() {
+		block_import_works(|b, ext| {
+			WasmExecutor::new().call(ext, 8, &WASM_CODE, "Core_execute_block", &b.encode()).unwrap();
+		})
+	}
+
+	fn block_import_with_transaction_works<F>(block_executor: F) where F: Fn(Block, &mut TestExternalities<Blake2Hasher>) {
 		let mut t = new_test_ext();
 
 		with_externalities(&mut t, || {
@@ -345,12 +362,29 @@ mod tests {
 			],
 		};
 
+		block_executor(b, &mut t);
+
 		with_externalities(&mut t, || {
-			execute_block(b);
 
 			assert_eq!(balance_of(Keyring::Alice.to_raw_public().into()), 0);
 			assert_eq!(balance_of(Keyring::Bob.to_raw_public().into()), 42);
 			assert_eq!(balance_of(Keyring::Charlie.to_raw_public().into()), 69);
 		});
 	}
+
+	#[test]
+	fn block_import_with_transaction_works_native() {
+		block_import_with_transaction_works(|b, ext| {
+			with_externalities(ext, || {
+				execute_block(b);
+			});
+		});
+	}
+	
+	#[test]
+	fn block_import_with_transaction_works_wasm() {
+		block_import_with_transaction_works(|b, ext| {
+			WasmExecutor::new().call(ext, 8, &WASM_CODE, "Core_execute_block", &b.encode()).unwrap();
+		})
+	}
 }
diff --git a/substrate/core/test-runtime/wasm/target/wasm32-unknown-unknown/release/substrate_test_runtime.compact.wasm b/substrate/core/test-runtime/wasm/target/wasm32-unknown-unknown/release/substrate_test_runtime.compact.wasm
index 56ba7e35f1..1dd3d898b2 100644
Binary files a/substrate/core/test-runtime/wasm/target/wasm32-unknown-unknown/release/substrate_test_runtime.compact.wasm and b/substrate/core/test-runtime/wasm/target/wasm32-unknown-unknown/release/substrate_test_runtime.compact.wasm differ
diff --git a/substrate/node/runtime/wasm/Cargo.lock b/substrate/node/runtime/wasm/Cargo.lock
index 1a8cd74f4e..f318f56846 100644
--- a/substrate/node/runtime/wasm/Cargo.lock
+++ b/substrate/node/runtime/wasm/Cargo.lock
@@ -1059,7 +1059,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "sr-sandbox"
+name = "sr-"
 version = "0.1.0"
 dependencies = [
  "parity-codec 2.1.5 (registry+https://github.com/rust-lang/crates.io-index)",