Test harness to support testing of sardonyx types, including:

• Bundle
• State
• System
• Resource loading.
• Arbitrary types that Systems use during processing.

The test harness minimizes boilerplate code to set up an sardonyx Application with common bundles, and can take in logic that is normally masked behind a number of layers through a thin interface.

Usage

The following shows a simple example of testing a State. More examples are in the Examples section.

# use std::marker::PhantomData;
#
# use sardonyx_test::prelude::*;
# use sardonyx::{
#     ecs::prelude::*,
#     prelude::*,
# };
#
# #[derive(Debug)]
# struct LoadResource;
#
# #[derive(Debug)]
# struct LoadingState;
#
# impl LoadingState {
#     fn new() -> Self {
#         LoadingState
#     }
# }
#
# impl<'a, 'b, E> State<GameData<'a, 'b>, E> for LoadingState
# where
#     E: Send + Sync + 'static,
# {
#     fn update(&mut self, data: StateData<'_, GameData<'_, '_>>) -> Trans<GameData<'a, 'b>, E> {
#         data.data.update(&data.world);
#
#         data.world.insert(LoadResource);
#
#         Trans::Pop
#     }
# }
#
// #[test]
fn loading_state_adds_load_resource() {
assert!(
sardonyxApplication::blank()
.with_state(|| LoadingState::new())
.with_assertion(|world| {
world.read_resource::<LoadResource>();
})
.run()
.is_ok()
);
}
#
# fn main() {
#     loading_state_adds_load_resource();
# }

The sardonyx application is initialized with one of the following functions, each providing a different set of bundles:

use sardonyx_test::prelude::*;

#[test]
fn test_name() {
// Start with no bundles
sardonyxApplication::blank();

// Start with the following bundles:
//
// * `TransformBundle`
// * `InputBundle`
// * `UiBundle`
//
// The type parameters here are the Axis and Action types for the
// `InputBundle` and `UiBundle`.
use sardonyx::input::StringBindings;
sardonyxApplication::ui_base::<StringBindings>();

// If you need types from the rendering bundle, make sure you have
// the `"test-support"` feature enabled:
//
// ```toml
// # Cargo.toml
// sardonyx = { version = "..", features = ["test-support"] }
// ```
//
// Then you can include the `RenderEmptyBundle`:
use sardonyx::renderer::{types::DefaultBackend, RenderEmptyBundle};
sardonyxApplication::blank()
.with_bundle(RenderEmptyBundle::<DefaultBackend>::new());
}

Next, attach the logic you wish to test using the various .with_*(..) methods:

# use sardonyx::{
#     core::bundle::SystemBundle,
#     ecs::prelude::*,
#     prelude::*,
# };
#
# #[derive(Debug)]
# struct MySystem;
#
# impl<'s> System<'s> for MySystem {
#     type SystemData = ();
#     fn run(&mut self, _: Self::SystemData) {}
# }
#
#[test]
fn test_name() {
let visibility = false; // Whether the window should be shown
sardonyxApplication::render_base::<String, String, _>("test_name", visibility)
.with_bundle(MyBundle::new())                // Registers a bundle.
.with_bundle_fn(|| MyNonSendBundle::new())   // Registers a `!Send` bundle.
.with_resource(MyResource::new())            // Adds a resource to the world.
.with_system(MySystem, "my_sys", &[])        // Registers a system with the main
// dispatcher.

// These are run in the order they are invoked.
// You may invoke them multiple times.
.with_setup(|world| { /* do something */ })
.with_state(|| MyState::new())
.with_effect(|world| { /* do something */ })
.with_assertion(|world| { /* do something */ })
// ...
}

Finally, call .run() to run the application. This returns sardonyx::Result<()>, so you can wrap it in an assert!(..);:

#[test]
fn test_name() {
let visibility = false; // Whether the window should be shown
assert!(
sardonyxApplication::render_base("test_name", visibility)
// ...
.run()
.is_ok()
);
}

Examples

Testing a bundle:

# use sardonyx_test::prelude::*;
# use sardonyx::{
#     core::bundle::SystemBundle,
#     ecs::prelude::*,
#     prelude::*,
# };
#
# #[derive(Debug)]
# struct ApplicationResource;
#
# #[derive(Debug)]
# struct MySystem;
#
# impl<'s> System<'s> for MySystem {
#     type SystemData = ReadExpect<'s, ApplicationResource>;
#
#     fn run(&mut self, _: Self::SystemData) {}
# }
#
# #[derive(Debug)]
# struct MyBundle;
# impl<'a, 'b> SystemBundle<'a, 'b> for MyBundle {
#     fn build(self, world: &mut World, builder: &mut DispatcherBuilder<'a, 'b>)
#     -> sardonyx::Result<()> {
#         world.insert(ApplicationResource);
#         builder.add(MySystem, "my_system", &[]);
#         Ok(())
#     }
# }
#
// #[test]
fn bundle_registers_system_with_resource() {
assert!(
sardonyxApplication::blank()
.with_bundle(MyBundle)
.with_assertion(|world| { world.read_resource::<ApplicationResource>(); })
.run()
.is_ok()
);
}
#
# fn main() {
#     bundle_registers_system_with_resource();
# }

Testing a system:

# use sardonyx_test::prelude::*;
# use sardonyx::{
#     ecs::prelude::*,
#     prelude::*,
# };
#
# struct MyComponent(pub i32);
#
# impl Component for MyComponent {
#     type Storage = DenseVecStorage<Self>;
# }
#
# #[derive(Debug)]
# struct MySystem;
#
# impl<'s> System<'s> for MySystem {
#     type SystemData = WriteStorage<'s, MyComponent>;
#
#     fn run(&mut self, mut my_component_storage: Self::SystemData) {
#         for mut my_component in (&mut my_component_storage).join() {
#             my_component.0 += 1
#         }
#     }
# }
#
// #[test]
fn system_increases_component_value_by_one() {
assert!(
sardonyxApplication::blank()
.with_system(MySystem, "my_system", &[])
.with_effect(|world| {
let entity = world.create_entity().with(MyComponent(0)).build();
world.insert(EffectReturn(entity));
})
.with_assertion(|world| {
let entity = world.read_resource::<EffectReturn<Entity>>().0.clone();

let my_component_storage = world.read_storage::<MyComponent>();
let my_component = my_component_storage
.get(entity)
.expect("Entity should have a `MyComponent` component.");

// If the system ran, the value in the `MyComponent` should be 1.
assert_eq!(1, my_component.0);
})
.run()
.is_ok()
);
}
#
# fn main() {
#     system_increases_component_value_by_one();
# }

Testing a System in a custom dispatcher. This is useful when your system must run after some setup has been done:

# use sardonyx_test::prelude::*;
# use sardonyx::{
#     ecs::prelude::*,
#     prelude::*,
# };
#
# // !Default
# struct MyResource(pub i32);
#
# #[derive(Debug)]
# struct MySystem;
#
# impl<'s> System<'s> for MySystem {
#     type SystemData = WriteExpect<'s, MyResource>;
#
#     fn run(&mut self, mut my_resource: Self::SystemData) {
#         my_resource.0 += 1
#     }
# }
#
// #[test]
fn system_increases_resource_value_by_one() {
assert!(
sardonyxApplication::blank()
.with_setup(|world| {
world.insert(MyResource(0));
})
.with_system_single(MySystem, "my_system", &[])
.with_assertion(|world| {
let my_resource = world.read_resource::<MyResource>();

// If the system ran, the value in the `MyResource` should be 1.
assert_eq!(1, my_resource.0);
})
.run()
.is_ok()
);
}
#
# fn main() {
#     system_increases_resource_value_by_one();
# }