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55 lines
2.3 KiB
Markdown
55 lines
2.3 KiB
Markdown
# Testing-related design notes
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## Simulation unit tests
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To encourage testing, it should be easy to:
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- describe a setup
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- assert what the outcome should be
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- sometimes just that no runtime invariants are broken
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- pop up a UI to interactively step through the test
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Some first tests to write:
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= car starting with no path on road with no parking spots, ensure they wind up parking at the first spot on some
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side street
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- car stops for departing car (winds up following it)
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- departing car waits for other car (winds up following it)
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- a line of cars moving through a stop sign looks jittery right now. correct or not?
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- following distances for cars of different lengths
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Unclear how to nicely let the test inspect stuff every tick.
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Rejected ideas:
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- make every pub(crate) so a unit test can reach into state anywhere. It ruins viz for testing.
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- JSONify stuff and look at that. too slow, and walking the JSON structure is annoying and not type-safe.
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- make one-off accessors for interesting stuff. pollutes code and is tedious.
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The idea that's sticking:
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- every tick, accumulate a list of events that occurred. publish these from various places.
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- most of the events are state transitions -- car leaves lane, intersection accepts ticket, car parks, bus departs
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- beyond unit testing, this will be useful for building up a compressed schedule for the time traveler
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- and already am kind of using this pattern to communicate between sim managers, spawners, etc
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- will help compute trip statistics later
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- would also be nice to log some of these
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## Watch tests easily
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- need to organize savestate captures
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- dedicated place: data/savestates/MAP/scenario/time
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- plumb map name, scenario name
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- should be able to just point to one of these saves, not refer to the map or RNG seed again
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- also kinda needed for time traveling later
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- when a problem happens, we want to back up a little bit
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- probably just need automatic occasional savestating, and to print a nice command to rerun from it
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## Diffing for A/B tests
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Basic problem: how do we show map edits/diffs?
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- could be useful for debugging as new data sources come in
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- and is vital part of the game
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- UI
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- highlight edited things
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- hold a button to show the original versions of things in a transparentish overlay
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How to show diffs for agents?
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