diff --git a/Cargo.toml b/Cargo.toml
index 4f1f93f..7a0efcc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,9 @@ name = "silentpayments"
 version = "0.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[lib]
+name = "silentpayments"
+crate-type = ["lib"]
 
 [dependencies]
 # bdk = {version = "0.20.0", features= ["all-keys"] }
diff --git a/src/main.rs b/src/lib.rs
similarity index 54%
rename from src/main.rs
rename to src/lib.rs
index 4121b99..5011782 100644
--- a/src/main.rs
+++ b/src/lib.rs
@@ -1,30 +1,30 @@
 #![allow(non_snake_case, dead_code)]
 mod input;
-mod receiving;
 mod sending;
+mod receiving;
 mod utils;
 
-use secp256k1::{hashes::sha256, XOnlyPublicKey};
-use std::collections::HashSet;
-use std::str::FromStr;
+#[cfg(test)]
+mod tests {
+    use std::{collections::HashSet, str::FromStr};
 
-use crate::{
-    input::ComparableHashMap,
-    receiving::{
-        derive_silent_payment_key_pair, get_A_sum_public_keys, get_receiving_addresses, scanning,
-        verify_and_calculate_signatures,
-    },
-    sending::create_outputs,
-    utils::hash_outpoints,
-};
+    use secp256k1::XOnlyPublicKey;
 
-fn main() {
-    let testdata = input::read_file();
+    use crate::{input::{self, ComparableHashMap, TestData}, sending::create_outputs, receiving::{derive_silent_payment_key_pair, get_receiving_addresses, get_A_sum_public_keys, scanning, verify_and_calculate_signatures}, utils::hash_outpoints};
 
-    for test in testdata {
+    #[test]
+    fn test_with_test_vectors() {
+        let testdata = input::read_file();
+
+        for test in testdata {
+            process_test_case(test);
+        }
+    }
+
+    fn process_test_case(test_case: TestData) {
         let mut sending_outputs: HashSet<String> = HashSet::new();
-        eprintln!("test.comment = {:?}", test.comment);
-        for sendingtest in test.sending {
+        eprintln!("test.comment = {:?}", test_case.comment);
+        for sendingtest in test_case.sending {
             let given = sendingtest.given;
 
             let expected = sendingtest.expected;
@@ -42,28 +42,20 @@ fn main() {
             let outputs_comparable: HashSet<ComparableHashMap> =
                 outputs.into_iter().map(|x| x.into()).collect();
 
-            if outputs_comparable == expected_comparable {
-                println!("sending succeeded");
-            } else {
-                eprintln!("sending expected = {:#?}", expected_comparable);
-                eprintln!("sending outputs = {:#?}", outputs_comparable);
-                std::process::exit(0);
-            }
+            assert_eq!(outputs_comparable, expected_comparable);
         }
 
-        for receivingtest in test.receiving {
+        for receivingtest in &test_case.receiving {
             let given = &receivingtest.given;
             let expected = &receivingtest.expected;
 
             let receiving_outputs: HashSet<String> = given.outputs.iter().cloned().collect();
-            if !sending_outputs.is_subset(&receiving_outputs) {
-                eprintln!("receivingOutputs = {:#?}", receiving_outputs);
-                eprintln!("sending_outputs = {:#?}", sending_outputs);
-                std::process::exit(0);
-            }
+
+            // assert that the sending outputs generated are equal
+            // to the expected receiving outputs
+            assert!(sending_outputs.is_subset(&receiving_outputs));
 
             // todo fix seed?
-            // let bip32_seed = hex::decode(&bip32_seed_str[2..]).unwrap();
             let bip32_seed_str = &given.bip32_seed;
             let (b_scan, b_spend, B_scan, B_spend) = derive_silent_payment_key_pair(bip32_seed_str);
 
@@ -71,12 +63,8 @@ fn main() {
 
             let set1: HashSet<_> = receiving_addresses.iter().collect();
             let set2: HashSet<_> = expected.addresses.iter().collect();
-            if !set1.eq(&set2) {
-                println!("receiving addressess failed");
-                eprintln!("receiving_addresses = {:#?}", receiving_addresses);
-                eprintln!("expected.addresses = {:#?}", expected.addresses);
-                std::process::exit(0);
-            }
+
+            assert_eq!(set1, set2);
 
             // can be even or odd !
             let outputs_to_check: Vec<XOnlyPublicKey> = given
@@ -102,14 +90,8 @@ fn main() {
             );
 
             let res = verify_and_calculate_signatures(&mut add_to_wallet, b_spend).unwrap();
-            if res.eq(&expected.outputs) {
-                println!("receiving succeeded");
-            } else {
-                eprintln!("res = {:#?}", res);
-                eprintln!("expected.outputs = {:#?}", expected.outputs);
-                println!("receiving failed");
-                std::process::exit(0);
-            }
+            assert_eq!(res, expected.outputs);
         }
+
     }
 }
diff --git a/src/receiving.rs b/src/receiving.rs
index 93e38e1..6364fb7 100644
--- a/src/receiving.rs
+++ b/src/receiving.rs
@@ -3,7 +3,7 @@ use bech32::ToBase32;
 use secp256k1::{hashes::Hash, Message, PublicKey, Scalar, Secp256k1, SecretKey, XOnlyPublicKey};
 use std::{collections::HashMap, str::FromStr};
 
-use crate::{input::ReceivingDataOutputs, sha256, utils::ser_uint32};
+use crate::{input::ReceivingDataOutputs, utils::ser_uint32};
 
 pub fn get_receiving_addresses(
     B_scan: PublicKey,
@@ -230,8 +230,8 @@ pub fn verify_and_calculate_signatures(
     b_spend: SecretKey,
 ) -> Result<Vec<ReceivingDataOutputs>, secp256k1::Error> {
     let secp = secp256k1::Secp256k1::new();
-    let msg = Message::from_hashed_data::<sha256::Hash>(b"message");
-    let aux = sha256::Hash::hash(b"random auxiliary data").to_byte_array();
+    let msg = Message::from_hashed_data::<secp256k1::hashes::sha256::Hash>(b"message");
+    let aux = secp256k1::hashes::sha256::Hash::hash(b"random auxiliary data").to_byte_array();
 
     let mut res: Vec<ReceivingDataOutputs> = vec![];
     for output in add_to_wallet {
diff --git a/src/sending.rs b/src/sending.rs
index dee5a79..efdbc0e 100644
--- a/src/sending.rs
+++ b/src/sending.rs
@@ -4,9 +4,8 @@ use secp256k1::{Parity, PublicKey, Scalar, Secp256k1, SecretKey};
 use std::{collections::HashMap, str::FromStr};
 
 use crate::{
-    hash_outpoints,
     input::SendingDataGiven,
-    utils::{ser_uint32, sha256},
+    utils::{ser_uint32, sha256, hash_outpoints},
 };
 
 fn get_a_sum_secret_keys(input: &Vec<(String, bool)>) -> SecretKey {