diff --git a/src/block_queue.rs b/src/block_queue.rs
index 5ce649710..08e22f799 100644
--- a/src/block_queue.rs
+++ b/src/block_queue.rs
@@ -292,12 +292,47 @@ mod tests {
 	use util::*;
 	use spec::*;
 	use block_queue::*;
+	use tests::helpers::*;
+	use error::*;
+
+	fn get_test_queue() -> BlockQueue {
+		let spec = get_test_spec();
+		let engine = spec.to_engine().unwrap();
+		BlockQueue::new(Arc::new(engine), IoChannel::disconnected())
+	}
 
 	#[test]
-	fn test_block_queue() {
+	fn can_be_created() {
 		// TODO better test
 		let spec = Spec::new_test();
 		let engine = spec.to_engine().unwrap();
 		let _ = BlockQueue::new(Arc::new(engine), IoChannel::disconnected());
 	}
+
+	#[test]
+	fn can_verify_blocks() {
+		let mut queue = get_test_queue();
+		if let Err(e) = queue.import_block(get_good_dummy_block()) {
+			panic!("error importing block that is valid by definition({:?})", e);
+		}
+	}
+
+	#[test]
+	fn returns_error_for_duplicates() {
+		let mut queue = get_test_queue();
+		if let Err(e) = queue.import_block(get_good_dummy_block()) {
+			panic!("error importing block that is valid by definition({:?})", e);
+		}
+		let duplicate_import = queue.import_block(get_good_dummy_block());
+
+		match duplicate_import {
+			Err(e) => {
+				match e {
+					ImportError::AlreadyQueued => {},
+					_ => { panic!("must return AlreadyQueued error"); }
+				}
+			}
+			Ok(_) => { panic!("must produce error"); }
+		}
+	}
 }
diff --git a/src/tests/client.rs b/src/tests/client.rs
index 2abeceb0b..56b6e7db0 100644
--- a/src/tests/client.rs
+++ b/src/tests/client.rs
@@ -2,34 +2,6 @@ use client::{BlockChainClient,Client};
 use super::test_common::*;
 use super::helpers::*;
 
-fn get_good_dummy_block() -> Bytes {
-	let mut block_header = Header::new();
-	let test_spec = get_test_spec();
-	let test_engine = test_spec.to_engine().unwrap();
-	block_header.gas_limit = decode(test_engine.spec().engine_params.get("minGasLimit").unwrap());
-	block_header.difficulty = decode(test_engine.spec().engine_params.get("minimumDifficulty").unwrap());
-	block_header.timestamp = 40;
-	block_header.number = 1;
-	block_header.parent_hash = test_engine.spec().genesis_header().hash();
-	block_header.state_root = test_engine.spec().genesis_header().state_root;
-
-	create_test_block(&block_header)
-}
-
-fn get_bad_state_dummy_block() -> Bytes {
-	let mut block_header = Header::new();
-	let test_spec = get_test_spec();
-	let test_engine = test_spec.to_engine().unwrap();
-	block_header.gas_limit = decode(test_engine.spec().engine_params.get("minGasLimit").unwrap());
-	block_header.difficulty = decode(test_engine.spec().engine_params.get("minimumDifficulty").unwrap());
-	block_header.timestamp = 40;
-	block_header.number = 1;
-	block_header.parent_hash = test_engine.spec().genesis_header().hash();
-	block_header.state_root = x!(0xbad);
-
-	create_test_block(&block_header)
-}
-
 #[test]
 fn created() {
 	let dir = RandomTempPath::new();
diff --git a/src/tests/helpers.rs b/src/tests/helpers.rs
index 3bab3fd4c..f87138795 100644
--- a/src/tests/helpers.rs
+++ b/src/tests/helpers.rs
@@ -176,4 +176,32 @@ pub fn generate_dummy_empty_blockchain() -> GuardedTempResult<BlockChain> {
 		temp: temp,
 		result: bc
 	}
-}
\ No newline at end of file
+}
+
+pub fn get_good_dummy_block() -> Bytes {
+	let mut block_header = Header::new();
+	let test_spec = get_test_spec();
+	let test_engine = test_spec.to_engine().unwrap();
+	block_header.gas_limit = decode(test_engine.spec().engine_params.get("minGasLimit").unwrap());
+	block_header.difficulty = decode(test_engine.spec().engine_params.get("minimumDifficulty").unwrap());
+	block_header.timestamp = 40;
+	block_header.number = 1;
+	block_header.parent_hash = test_engine.spec().genesis_header().hash();
+	block_header.state_root = test_engine.spec().genesis_header().state_root;
+
+	create_test_block(&block_header)
+}
+
+pub fn get_bad_state_dummy_block() -> Bytes {
+	let mut block_header = Header::new();
+	let test_spec = get_test_spec();
+	let test_engine = test_spec.to_engine().unwrap();
+	block_header.gas_limit = decode(test_engine.spec().engine_params.get("minGasLimit").unwrap());
+	block_header.difficulty = decode(test_engine.spec().engine_params.get("minimumDifficulty").unwrap());
+	block_header.timestamp = 40;
+	block_header.number = 1;
+	block_header.parent_hash = test_engine.spec().genesis_header().hash();
+	block_header.state_root = x!(0xbad);
+
+	create_test_block(&block_header)
+}