diff --git a/zebra-chain/src/transaction/hash.rs b/zebra-chain/src/transaction/hash.rs
index 2c013734..bbba046e 100644
--- a/zebra-chain/src/transaction/hash.rs
+++ b/zebra-chain/src/transaction/hash.rs
@@ -2,6 +2,9 @@ use std::fmt;
 
 use hex;
 
+#[cfg(test)]
+use proptest_derive::Arbitrary;
+
 use crate::{serialization::ZcashSerialize, sha256d_writer::Sha256dWriter};
 
 use super::Transaction;
@@ -11,6 +14,7 @@ use super::Transaction;
 /// TODO: I'm pretty sure this is also a SHA256d hash but I haven't
 /// confirmed it yet.
 #[derive(Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(test, derive(Arbitrary))]
 pub struct TransactionHash(pub [u8; 32]);
 
 impl From<Transaction> for TransactionHash {
diff --git a/zebra-chain/src/transaction/tests.rs b/zebra-chain/src/transaction/tests.rs
index 15d06b01..89c198f6 100644
--- a/zebra-chain/src/transaction/tests.rs
+++ b/zebra-chain/src/transaction/tests.rs
@@ -3,8 +3,8 @@ use std::io::Cursor;
 use chrono::{TimeZone, Utc};
 
 use proptest::{
-    collection::{vec, SizeRange},
-    option,
+    arbitrary::{any, Arbitrary},
+    collection::vec,
     prelude::*,
 };
 
@@ -15,6 +15,7 @@ use crate::{
 
 use super::*;
 
+#[cfg(test)]
 impl Arbitrary for Transaction {
     type Parameters = ();
 
@@ -192,23 +193,14 @@ fn librustzcash_tx_deserialize_and_round_trip() {
 proptest! {
 
     #[test]
-    fn transaction_roundtrip(mut random in vec(any::<u8>(), 1982)) {
+    fn transaction_roundtrip(tx in any::<Transaction>()) {
 
-        // Standard header and version group id.
-        let mut data = vec![0x04, 0x00, 0x00, 0x80, 0x85, 0x20, 0x2f, 0x89];
-        data.append(&mut random);
+        let mut data = Vec::new();
 
-        // println!("{:?}", data);
+        tx.zcash_serialize(&mut data).expect("tx should serialize");
 
-        let tx = Transaction::zcash_deserialize(&data[..]).expect("randomized tx should deserialize");
+        let tx2 = Transaction::zcash_deserialize(&data[..]).expect("randomized tx should deserialize");
 
-        println!("{:?}", tx);
-
-        let mut data2 = Vec::new();
-        tx.zcash_serialize(&mut data2).expect("tx should serialize");
-
-        assert_ne!(&data[..], &data2[..]);
-
-        prop_assert_ne![data, data2];
+        prop_assert_eq![tx, tx2];
     }
 }
diff --git a/zebra-chain/src/transaction/transparent.rs b/zebra-chain/src/transaction/transparent.rs
index 9cfa7b15..d21e1fd7 100644
--- a/zebra-chain/src/transaction/transparent.rs
+++ b/zebra-chain/src/transaction/transparent.rs
@@ -1,5 +1,8 @@
 //! Transaction types.
 
+#[cfg(test)]
+use proptest_derive::Arbitrary;
+
 use crate::types::Script;
 
 use super::TransactionHash;
@@ -8,6 +11,7 @@ use super::TransactionHash;
 ///
 /// A particular transaction output reference.
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(test, derive(Arbitrary))]
 pub struct OutPoint {
     /// References the transaction that contains the UTXO being spent.
     pub hash: TransactionHash,
@@ -19,6 +23,7 @@ pub struct OutPoint {
 
 /// A transparent input to a transaction.
 #[derive(Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(test, derive(Arbitrary))]
 pub struct TransparentInput {
     /// The previous output transaction reference.
     pub previous_output: OutPoint,
@@ -45,6 +50,7 @@ pub struct TransparentInput {
 /// that spends my UTXO and sends 1 ZEC to you and 1 ZEC back to me
 /// (just like receiving change).
 #[derive(Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(test, derive(Arbitrary))]
 pub struct TransparentOutput {
     /// Transaction value.
     // At https://en.bitcoin.it/wiki/Protocol_documentation#tx, this is an i64.