From 3f6d4fc0275292b48ad97886fb1f49b8004942ee Mon Sep 17 00:00:00 2001
From: vantuz-subhuman <vantuz-subhuman@yandex.ru>
Date: Wed, 29 Sep 2021 23:12:19 +0300
Subject: [PATCH] Extracted fake-priv-key into a function and added tests

---
 rust/src/tx_builder.rs | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/rust/src/tx_builder.rs b/rust/src/tx_builder.rs
index dea7c7b2..0a3f9efc 100644
--- a/rust/src/tx_builder.rs
+++ b/rust/src/tx_builder.rs
@@ -37,15 +37,19 @@ fn witness_keys_for_cert(cert_enum: &Certificate, keys: &mut BTreeSet<Ed25519Key
     }
 }
 
+fn fake_private_key() -> Bip32PrivateKey {
+    Bip32PrivateKey::from_bip39_entropy(
+        // art forum devote street sure rather head chuckle guard poverty release quote oak craft enemy
+        &[0x0c, 0xcb, 0x74, 0xf3, 0x6b, 0x7d, 0xa1, 0x64, 0x9a, 0x81, 0x44, 0x67, 0x55, 0x22, 0xd4, 0xd8, 0x09, 0x7c, 0x64, 0x12],
+        &[]
+    )
+}
+
 // tx_body must be the result of building from tx_builder
 // constructs the rest of the Transaction using fake witness data of the correct length
 // for use in calculating the size of the final Transaction
 fn fake_full_tx(tx_builder: &TransactionBuilder, body: TransactionBody) -> Result<Transaction, JsError> {
-    let fake_key_root = Bip32PrivateKey::from_bip39_entropy(
-        // art forum devote street sure rather head chuckle guard poverty release quote oak craft enemy
-        &[0x0c, 0xcb, 0x74, 0xf3, 0x6b, 0x7d, 0xa1, 0x64, 0x9a, 0x81, 0x44, 0x67, 0x55, 0x22, 0xd4, 0xd8, 0x09, 0x7c, 0x64, 0x12],
-        &[]
-    );
+    let fake_key_root = fake_private_key();
 
     // recall: this includes keys for input, certs and withdrawals
     let vkeys = match tx_builder.input_types.vkeys.len() {
@@ -604,6 +608,19 @@ mod tests {
         index | 0x80_00_00_00
     }
 
+    #[test]
+    fn check_fake_private_key() {
+        let fpk = fake_private_key();
+        assert_eq!(
+            fpk.to_bech32(),
+            "xprv1hretan5mml3tq2p0twkhq4tz4jvka7m2l94kfr6yghkyfar6m9wppc7h9unw6p65y23kakzct3695rs32z7vaw3r2lg9scmfj8ec5du3ufydu5yuquxcz24jlkjhsc9vsa4ufzge9s00fn398svhacse5su2awrw",
+        );
+        assert_eq!(
+            fpk.to_public().to_bech32(),
+            "xpub1eamrnx3pph58yr5l4z2wghjpu2dt2f0rp0zq9qquqa39p52ct0xercjgmegfcpcdsy4t9ld90ps2epmtcjy3jtq77n8z20qe0m3pnfqntgrgj",
+        );
+    }
+
     #[test]
     fn build_tx_with_change() {
         let linear_fee = LinearFee::new(&to_bignum(500), &to_bignum(2));