Testing

Testing is a crucial part of any software development process. Dojo provides a testing framework that allows you to write tests for your smart contracts. Since Dojo uses a custom compiler, you need to use Sozo to test your contracts.

From your project directory, simply:

sozo test

This will search for all tests within your project and run them.

Writing Unit Tests

It is best practise to include unit tests in the same file as the model / system you are writing.

Lets show a model test example from the dojo-starter:

// models.cairo
 
// ...
 
#[cfg(test)]
mod tests {
    use super::{Position, Vec2, Vec2Trait};
 
    #[test]
    #[available_gas(100000)]
    fn test_vec_is_zero() {
        assert!(Vec2Trait::is_zero(Vec2 { x: 0, y: 0 }), "not zero");
    }
 
    #[test]
    #[available_gas(100000)]
    fn test_vec_is_equal() {
        let position = Vec2 { x: 420, y: 0 };
        assert!(position.is_equal(Vec2 { x: 420, y: 0 }), "not equal");
    }
}

In this test we are testing the is_zero and is_equal functions of the Position model. It is good practise to test all functions of your models.

Writing Integration Tests

Integration tests are e2e tests that test the entire system. You can write integration tests for your world by creating a tests directory in your project root. Then create a file for each integration test you want to write.

This is the example from the dojo-starter:

// move.cairo
 
#[cfg(test)]
mod tests {
    use dojo::model::{ModelStorage, ModelValueStorage, ModelStorageTest};
    use dojo::world::WorldStorageTrait;
    use dojo_cairo_test::{spawn_test_world, NamespaceDef, TestResource, ContractDefTrait};
 
    use dojo_starter::systems::actions::{actions, IActionsDispatcher, IActionsDispatcherTrait};
    use dojo_starter::models::{Position, m_Position, Moves, m_Moves, Direction};
 
    fn namespace_def() -> NamespaceDef {
        let ndef = NamespaceDef {
            namespace: "dojo_starter", resources: [
                TestResource::Model(m_Position::TEST_CLASS_HASH.try_into().unwrap()),
                TestResource::Model(m_Moves::TEST_CLASS_HASH.try_into().unwrap()),
                TestResource::Event(actions::e_Moved::TEST_CLASS_HASH.try_into().unwrap()),
                TestResource::Contract(
                    ContractDefTrait::new(actions::TEST_CLASS_HASH, "actions")
                        .with_writer_of([dojo::utils::bytearray_hash(@"dojo_starter")].span())
                )
            ].span()
        };
 
        ndef
    }
 
    #[test]
    fn test_world_test_set() {
        // Initialize test environment
        let caller = starknet::contract_address_const::<0x0>();
        let ndef = namespace_def();
        let mut world = spawn_test_world([ndef].span());
 
        // Test initial position
        let mut position: Position = world.read_model(caller);
        assert(position.vec.x == 0 && position.vec.y == 0, "initial position wrong");
 
        // Test write_model_test
        position.vec.x = 122;
        position.vec.y = 88;
 
        world.write_model_test(@position);
 
        let mut position: Position = world.read_model(caller);
        assert(position.vec.y == 88, "write_value_from_id failed");
 
        // Test model deletion
        world.erase_model(@position);
        let position: Position = world.read_model(caller);
        assert(position.vec.x == 0 && position.vec.y == 0, "erase_model failed");
    }
 
    #[test]
    #[available_gas(30000000)]
    fn test_move() {
        let caller = starknet::contract_address_const::<0x0>();
 
        let ndef = namespace_def();
        let mut world = spawn_test_world([ndef].span());
 
        let (contract_address, _) = world.dns(@"actions").unwrap();
        let actions_system = IActionsDispatcher { contract_address };
 
        actions_system.spawn();
        let initial_moves: Moves = world.read_model(caller);
        let initial_position: Position = world.read_model(caller);
 
        assert(
            initial_position.vec.x == 10 && initial_position.vec.y == 10, "wrong initial position"
        );
 
        actions_system.move(Direction::Right(()));
 
        let moves: Moves = world.read_model(caller);
        let right_dir_felt: felt252 = Direction::Right(()).into();
 
        assert(moves.remaining == initial_moves.remaining - 1, "moves is wrong");
        assert(moves.last_direction.into() == right_dir_felt, "last direction is wrong");
 
        let new_position: Position = world.read_model(caller);
        assert(new_position.vec.x == initial_position.vec.x + 1, "position x is wrong");
        assert(new_position.vec.y == initial_position.vec.y, "position y is wrong");
    }
}

Useful Dojo Test Functions

spawn_test_world - This function will deploy a new world and register the models passed in.
deploy_contract - This function will deploy a new contract and return the contract address.