31 lines
1.1 KiB
Rust
31 lines
1.1 KiB
Rust
// file: crates/engines/engine-v1-common/unit_tests/game_loop.rs
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// version: 1
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#[derive(Default)]
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struct CountingGame {
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updates: u64,
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last_frame: std::option::Option<crate::EngineFrame>,
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}
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impl crate::EngineGame for CountingGame {
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fn update(&mut self, frame: crate::EngineFrame, _input: crate::InputState) {
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self.updates = self.updates.saturating_add(1);
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self.last_frame = std::option::Option::Some(frame);
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return;
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}
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}
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#[test]
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fn fixed_step_runner_advances_index_and_elapsed_time() {
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game_logging_lib::with_test_tracing("fixed_step_runner_advances_index_and_elapsed_time", || {
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let mut game = CountingGame::default();
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let mut runner = crate::FixedStepRunner::new(std::time::Duration::from_millis(16));
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runner.tick(&mut game, crate::InputState::none());
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runner.tick(&mut game, crate::InputState::none());
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assert_eq!(game.updates, 2);
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assert_eq!(runner.next_frame_index(), 2);
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assert_eq!(runner.elapsed(), std::time::Duration::from_millis(32));
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assert_eq!(game.last_frame.map(crate::EngineFrame::index), std::option::Option::Some(1));
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});
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}
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