test: add a test for exchange_utils (#383)

* Add tests

* Update test_exchange_utils.cairo

* Update test_exchange_utils.cairo

* Update lib.cairo

* Update test_exchange_utils.cairo

* Update test_exchange_utils.cairo

---------

Co-authored-by: sparqet <37338401+sparqet@users.noreply.github.com>

tests/exchange/test_exchange_utils.cairo

@@ -0,0 +1,50 @@
+use starknet::{
+    ContractAddress, get_caller_address, get_contract_address, Felt252TryIntoContractAddress,
+    contract_address_const
+};
+use starknet::info::get_block_number;
+use snforge_std::{declare, start_prank, stop_prank, start_roll, ContractClassTrait};
+
+use satoru::data::keys;
+use satoru::data::data_store::{IDataStoreDispatcher, IDataStoreDispatcherTrait};
+use satoru::exchange::exchange_utils::validate_request_cancellation;
+use satoru::tests_lib::{setup, teardown};
+
+#[test]
+fn given_exchange_utils_when_validate_request_cancellation_then_success() {
+    // Setup
+    let (_, _, data_store) = setup();
+    let contract_address = contract_address_const::<0>();
+
+    // Test
+    let expiration_age = 5;
+    data_store.set_u128(keys::request_expiration_block_age(), expiration_age);
+
+    let block_number = get_block_number();
+
+    let created_at_block = block_number - 5;
+    validate_request_cancellation(data_store, created_at_block, 'SOME_REQUEST_TYPE');
+
+    let created_at_block = block_number - 6;
+    validate_request_cancellation(data_store, created_at_block, 'SOME_REQUEST_TYPE');
+
+    // Teardown
+    teardown(data_store.contract_address);
+}
+
+#[test]
+#[should_panic(expected: ('request_not_yet_cancellable', 'SOME_REQUEST_TYPE'))]
+fn given_exchange_utils_when_validate_request_cancellation_then_fails() {
+    // Setup
+    let (_, _, data_store) = setup();
+    let contract_address = contract_address_const::<0>();
+
+    // Test
+    let expiration_age = 5;
+    data_store.set_u128(keys::request_expiration_block_age(), expiration_age);
+
+    let block_number = get_block_number();
+    let created_at_block = block_number - 4;
+
+    validate_request_cancellation(data_store, created_at_block, 'SOME_REQUEST_TYPE');
+}

tests/lib.cairo

@@ -44,6 +44,7 @@ mod exchange {
     mod test_liquidation_handler;
     mod test_withdrawal_handler;
     mod test_deposit_handler;
+    mod test_exchange_utils;
     mod test_base_order_handler;
 }
 mod feature {