Make test-client generic over runtime (#2824)

* Make test-client generic over runtime.

* Make sure genesis storage is constructed correctly.

* Use prelude in tests.

* Add an example of how to use test-client with node/runtime.

* Bump version.

* Rename test-clients.

substrate/core/client/src/light/call_executor.rs

@@ -473,7 +473,7 @@ pub fn check_execution_proof<Header, E, H>(
 #[cfg(test)]
 mod tests {
 	use consensus::BlockOrigin;
-	use test_client::{self, runtime::{Block, Header}, runtime::RuntimeApi, TestClient};
+	use test_client::{self, runtime::Header, ClientExt, TestClient};
 	use executor::NativeExecutionDispatch;
 	use crate::backend::{Backend, NewBlockState};
 	use crate::in_mem::Backend as InMemBackend;
@@ -482,13 +482,6 @@ mod tests {
 
 	#[test]
 	fn execution_proof_is_generated_and_checked() {
-		type TestClient = test_client::client::Client<
-			test_client::Backend,
-			test_client::Executor,
-			Block,
-			RuntimeApi
-		>;
-
 		fn execute(remote_client: &TestClient, at: u64, method: &'static str) -> (Vec<u8>, Vec<u8>) {
 			let remote_block_id = BlockId::Number(at);
 			let remote_root = remote_client.state_at(&remote_block_id)

substrate/core/client/src/light/fetcher.rs

@@ -491,7 +491,7 @@ pub mod tests {
 	use executor::{self, NativeExecutionDispatch};
 	use crate::error::Error as ClientError;
 	use test_client::{
-		self, TestClient, blockchain::HeaderBackend, AccountKeyring,
+		self, ClientExt, blockchain::HeaderBackend, AccountKeyring,
 		runtime::{self, Hash, Block, Header, Extrinsic}
 	};
 	use consensus::BlockOrigin;