diff --git a/ethcore/src/account.rs b/ethcore/src/account.rs
index ec39f8043..0d535f7ce 100644
--- a/ethcore/src/account.rs
+++ b/ethcore/src/account.rs
@@ -21,6 +21,7 @@ pub struct Account {
 }
 
 impl Account {
+	#[cfg(test)]
 	/// General constructor.
 	pub fn new(balance: U256, nonce: U256, storage: HashMap<H256, H256>, code: Bytes) -> Account {
 		Account {
diff --git a/ethcore/src/pod_account.rs b/ethcore/src/pod_account.rs
index 97cfcb6fd..76127b89a 100644
--- a/ethcore/src/pod_account.rs
+++ b/ethcore/src/pod_account.rs
@@ -16,6 +16,7 @@ pub struct PodAccount {
 
 impl PodAccount {
 	/// Construct new object.
+	#[cfg(test)]
 	pub fn new(balance: U256, nonce: U256, code: Bytes, storage: BTreeMap<H256, H256>) -> PodAccount {
 		PodAccount { balance: balance, nonce: nonce, code: code, storage: storage }
 	}
diff --git a/ethcore/src/pod_state.rs b/ethcore/src/pod_state.rs
index f37a327f8..22969f36b 100644
--- a/ethcore/src/pod_state.rs
+++ b/ethcore/src/pod_state.rs
@@ -10,6 +10,7 @@ impl PodState {
 	pub fn new() -> PodState { Default::default() }
 
 	/// Contruct a new object from the `m`.
+	#[cfg(test)]
 	pub fn from(m: BTreeMap<Address, PodAccount>) -> PodState { PodState(m) }
 
 	/// Get the underlying map.
@@ -21,6 +22,7 @@ impl PodState {
 	}
 
 	/// Drain object to get the underlying map.
+	#[cfg(test)]
 	pub fn drain(self) -> BTreeMap<Address, PodAccount> { self.0 }
 }
 
diff --git a/ethcore/src/state.rs b/ethcore/src/state.rs
index 6456aee77..fb336f3bb 100644
--- a/ethcore/src/state.rs
+++ b/ethcore/src/state.rs
@@ -2,7 +2,7 @@ use common::*;
 use engine::Engine;
 use executive::Executive;
 use pod_account::*;
-use pod_state::*;
+use pod_state::PodState;
 //use state_diff::*;	// TODO: uncomment once to_pod() works correctly.
 
 /// TODO [Gav Wood] Please document me
@@ -20,6 +20,7 @@ pub struct State {
 
 impl State {
 	/// Creates new state with empty state root
+	#[cfg(test)]
 	pub fn new(mut db: JournalDB, account_start_nonce: U256) -> State {
 		let mut root = H256::new();
 		{
@@ -60,11 +61,6 @@ impl State {
 		&self.root
 	}
 
-	/// Expose the underlying database; good to use for calling `state.db().commit()`.
-	pub fn db(&mut self) -> &mut JournalDB {
-		&mut self.db
-	}
-
 	/// Create a new contract at address `contract`. If there is already an account at the address
 	/// it will have its code reset, ready for `init_code()`.
 	pub fn new_contract(&mut self, contract: &Address, balance: U256) {
@@ -190,6 +186,7 @@ impl State {
 	}
 
 	/// Populate the state from `accounts`.
+	#[cfg(test)]
 	pub fn populate_from(&mut self, accounts: PodState) {
 		for (add, acc) in accounts.drain().into_iter() {
 			self.cache.borrow_mut().insert(add, Some(Account::from_pod(acc)));
@@ -207,6 +204,7 @@ impl State {
 		})
 	}
 
+	#[cfg(test)]
 	/// Populate a PodAccount map from this state.
 	pub fn to_pod(&self) -> PodState {
 		// TODO: handle database rather than just the cache.
diff --git a/ethcore/src/transaction.rs b/ethcore/src/transaction.rs
index 73eff953c..d71506672 100644
--- a/ethcore/src/transaction.rs
+++ b/ethcore/src/transaction.rs
@@ -6,11 +6,11 @@ use error::*;
 use evm::Schedule;
 
 #[derive(Debug, Clone)]
-/// TODO [Gav Wood] Please document me
+/// Transaction action type.
 pub enum Action {
-	/// TODO [Gav Wood] Please document me
+	/// Create creates new contract.
 	Create,
-	/// TODO [debris] Please document me
+	/// Calls contract at given address.
 	Call(Address),
 }
 
@@ -49,6 +49,7 @@ pub struct Transaction {
 
 impl Transaction {
 	/// TODO [Gav Wood] Please document me
+	#[cfg(test)]
 	pub fn new() -> Self {
 		Transaction {
 			nonce: x!(0),
@@ -66,6 +67,7 @@ impl Transaction {
 	}
 
 	/// Create a new message-call transaction.
+	#[cfg(test)]
 	pub fn new_call(to: Address, value: U256, data: Bytes, gas: U256, gas_price: U256, nonce: U256) -> Transaction {
 		Transaction {
 			nonce: nonce,
@@ -83,6 +85,7 @@ impl Transaction {
 	}
 
 	/// Create a new contract-creation transaction.
+	#[cfg(test)]
 	pub fn new_create(value: U256, data: Bytes, gas: U256, gas_price: U256, nonce: U256) -> Transaction {
 		Transaction {
 			nonce: nonce,
@@ -201,6 +204,7 @@ impl Transaction {
 	}
 
 	/// Signs the transaction as coming from `sender`.
+	#[cfg(test)]
 	pub fn signed(self, secret: &Secret) -> Transaction { let mut r = self; r.sign(secret); r }
 
 	/// Get the transaction cost in gas for the given params.