GeezerVison

+++ b/js-packages/web-console/src/lib/compositions/counterAnimation.spec.ts
+import { describe, expect, it } from 'vitest'
+import { CounterAnimator, MAX_COUNTED_STEP } from './counterAnimation'
+import { ManualScheduler } from './manualAnimationScheduler'
+
+const PERIOD = 2000
+const setup = () => {
+  const scheduler = new ManualScheduler()
+  const shown: number[] = []
+  const counter = new CounterAnimator(PERIOD, (v) => shown.push(v), { scheduler })
+  return { scheduler, shown, counter, last: () => shown.at(-1) }
+}
+
+describe('CounterAnimator', () => {
+  it('counts up to the new value in one period while the activity runs', () => {
+    const { counter, scheduler, last } = setup()
+    counter.update({ value: 7, active: true })
+    counter.update({ value: 11, active: true })
+    scheduler.advance(PERIOD / 2)
+    expect(last()).toBe(9)
+    scheduler.advance(PERIOD / 2)
+    expect(last()).toBe(11)
+    expect(scheduler.pendingCount).toBe(0)
+  })
+  it('jumps after an idle poll, on a decrease, and on a step above MAX_COUNTED_STEP', () => {
+    const { counter, last } = setup()
+    counter.update({ value: 7, active: false })
+    counter.update({ value: 9, active: true })
+    expect(last()).toBe(9)
+    counter.update({ value: 3, active: true })
+    expect(last()).toBe(3)
+    counter.update({ value: 4 + MAX_COUNTED_STEP, active: true })
+    expect(last()).toBe(4 + MAX_COUNTED_STEP)
+  })
+  it('continues from the shown value when a new poll interrupts a count', () => {
+    const { counter, scheduler, last } = setup()
+    counter.update({ value: 0, active: true })
+    counter.update({ value: 4, active: true })
+    scheduler.advance(PERIOD / 2)
+    expect(last()).toBe(2)
+    counter.update({ value: 6, active: true })
+    scheduler.advance(PERIOD)
+    expect(last()).toBe(6)
+  })
+  it('cancels a running count on dispose', () => {
+    const { counter, scheduler } = setup()
+    counter.update({ value: 0, active: true })
+    counter.update({ value: 4, active: true })
+    counter.dispose()
+    expect(scheduler.pendingCount).toBe(0)
+  })
+})