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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:


...//rest of code
mod tests {
    use super::{Position, Vec2, Vec2Trait};
    fn test_vec_is_zero() {
        assert!(Vec2Trait::is_zero(Vec2 { x: 0, y: 0 }), "not zero");
    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:


mod tests {
    use dojo::world::{IWorldDispatcherTrait, IWorldDispatcher};
    use dojo::test_utils::{spawn_test_world, deploy_contract};
    use dojo_examples::models::{position, moves};
    use dojo_examples::models::{Position, Moves, Direction};
    use super::{actions, IActionsDispatcher, IActionsDispatcherTrait};
    // helper setup function
    // reusable function for tests
    fn setup_world() -> IActionsDispatcher {
        // components
        let mut models = array![position::TEST_CLASS_HASH, moves::TEST_CLASS_HASH];
         // deploy world with models
        let world = spawn_test_world(models);
        // deploy systems contract
        let contract_address = world
            .deploy_contract('salt', actions::TEST_CLASS_HASH.try_into().unwrap());
        let actions_system = IActionsDispatcher { contract_address };
    fn test_move() {
        // caller
        let caller = starknet::contract_address_const::<0x0>();
        let actions_system = setup_world();
         // System calls
        // check moves
        let moves = get!(world, caller, (Moves));
        assert!(moves.remaining == 99, "moves is wrong");
        // get new_position
        let new_position = get!(world, caller, Position);
        // check new position x
        assert!(new_position.vec.x == 11, "position x is wrong");
        // check new position y
        assert!(new_position.vec.y == 10, "position y is wrong");

Useful Dojo Test Functions

spawn_test_world(models) - This function will create a test world with the models and systems you pass in. It will also deploy the world and register the models and systems.