Function testUpgradeHandlers

Guarantee (and run) a unit test for EVERY upgrade handler. Call it once from a co-located test: it walks the history and, for each entry that has a handler, requires a cases[version] — throwing if one is missing — then builds a store at the handler's input version, runs setup, applies the handler via runUpgradeStep, and runs expect. Add a handler without a case and this fails; a case pointing at a version with no handler also fails.

it("every upgrader is tested", () => testUpgradeHandlers(versions, {
  4: {
    setup: (s) => s.ensureArchetype(["hp"]).insert({ hp: 42 }),
    expect: (s, e) => expect(s.read(e)?.hp).toEqual({ current: 42, max: 42 }),
  },
}));
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