diff --git a/tests/alicebob.nim b/tests/alicebob.nim
new file mode 100644
index 0000000..bc2f18e
--- /dev/null
+++ b/tests/alicebob.nim
@@ -0,0 +1,21 @@
+import pkg/questionable
+import abc
+
+let a, b = PrivateKey.random
+
+proc alice*(_: type PrivateKey): PrivateKey =
+  a
+
+proc bob*(_: type PrivateKey): PrivateKey =
+  b
+
+proc alice*(_: type PublicKey): PublicKey =
+  a.toPublicKey
+
+proc bob*(_: type PublicKey): PublicKey =
+  b.toPublicKey
+
+proc genesis*(_: type Transaction): Transaction =
+  let alice = PublicKey.alice
+  let bob = PublicKey.bob
+  !Transaction.init({alice: 100.u256, bob: 100.u256})
diff --git a/tests/examples.nim b/tests/examples.nim
index c350823..36d7ae0 100644
--- a/tests/examples.nim
+++ b/tests/examples.nim
@@ -1,7 +1,7 @@
+import std/random
 import pkg/questionable
-import abc/keys
-import abc/transactions
-import abc/wallet
+import abc
+import ./alicebob
 
 proc example*(_: type PrivateKey): PrivateKey =
   PrivateKey.random
@@ -9,11 +9,17 @@ proc example*(_: type PrivateKey): PrivateKey =
 proc example*(_: type PublicKey): PublicKey =
   PrivateKey.example.toPublicKey
 
-proc example*(_: type Transaction): Transaction =
-  let alice, bob = PublicKey.example
-  let genesis = !Transaction.init({alice: 32.u256, bob: 10.u256})
-  !Transaction.init({genesis.hash: alice}, {alice: 2.u256, bob: 30.u256})
-
 proc example*(_: type Wallet): Wallet =
   let key = PrivateKey.example
   Wallet.init(key)
+
+proc example*(_: type Transaction): Transaction =
+  let alice = PublicKey.alice
+  let bob = PublicKey.bob
+  let genesis = Transaction.genesis
+  let amount = rand(100).u256
+  var transaction = !Transaction.init(
+    {genesis.hash: alice},
+    {bob: amount, alice: 100.u256 - amount}
+  )
+  transaction
diff --git a/tests/testTransactions.nim b/tests/testTransactions.nim
index 62afb8b..cdb9212 100644
--- a/tests/testTransactions.nim
+++ b/tests/testTransactions.nim
@@ -1,10 +1,10 @@
 import ./basics
+import ./alicebob
 
 suite "Transactions":
 
-  let aliceKey, bobKey = PrivateKey.example
-  let alice = aliceKey.toPublicKey
-  let bob = bobKey.toPublicKey
+  let alice = PublicKey.alice
+  let bob = PublicKey.bob
 
   test "a genesis transaction can be made":
     let genesis = Transaction.init({alice: 32.u256, bob: 10.u256})
@@ -67,9 +67,9 @@ suite "Transactions":
     )
     let hash = transaction.hash.toBytes
     check not transaction.hasValidSignature
-    transaction.add(aliceKey.sign(hash))
+    transaction.add(PrivateKey.alice.sign(hash))
     check transaction.hasValidSignature
-    transaction.add(bobKey.sign(hash))
+    transaction.add(PrivateKey.bob.sign(hash))
     check not transaction.hasValidSignature
 
   test "transaction must have at least one output":