LdtkPlugin cannot be ran in Testing Environment

[divark]

Problem

When running this library (mimicking the basic example) in a Test, the test fails due to Resources existing relating to Rendering:

thread 'plugin_does_not_crash_without_render' panicked at /home/divark/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bevy_ecs-0.13.2/src/system/system_param.rs:570:17:
Resource requested by bevy_ecs_ldtk::systems::process_ldtk_levels does not exist: bevy_asset::assets::Assets<bevy_sprite::texture_atlas::TextureAtlasLayout>
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Encountered a panic in system `bevy_ecs_ldtk::systems::process_ldtk_levels`!
Encountered a panic in system `bevy_app::main_schedule::Main::run_main`!

Steps to Reproduce

0. Clone this library.
1. Copy the test code below into tests/no_render.rs
2. Run cargo test --test no_render --no-default-features --features=internal_levels
3. Observe the error message mentioned above.

The Test Code

use bevy::prelude::*;
use bevy_ecs_ldtk::prelude::*;

fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
    commands.spawn(LdtkWorldBundle {
        ldtk_handle: asset_server.load("my_project.ldtk"),
        ..Default::default()
    });
}

#[test]
fn plugin_does_not_crash_without_render() {
    let mut app = App::new();

    app.add_plugins(MinimalPlugins);

    app.add_plugins(AssetPlugin::default());
    app.add_plugins(ImagePlugin::default());
    app.add_plugins(LdtkPlugin);

    app.add_systems(Startup, setup);
    app.insert_resource(LevelSelection::index(0));

    let mut num_entities = 0;
    loop {
        app.update();

        num_entities = app
            .world
            .query::<&EntityInstance>()
            .iter(&app.world)
            .count();

        if num_entities != 0 {
            break;
        }
    }

    assert_ne!(num_entities, 0);
}