Testing code without a render function

I was writing some utility functions using SolidJS primitives and ran into the issue that memos don't update. This is the minimal

vitest

vitest

vitest

vitest where I could reproduce the issue:

test('memo', () => {
  createRoot(() => {
    const [signal, setSignal] = createSignal(false)
    const memo = createMemo(() => signal())
    expect(memo()).eq(false)
    setSignal(true)
    expect(memo()).eq(true)
  })
})

test('memo', () => {
  createRoot(() => {
    const [signal, setSignal] = createSignal(false)
    const memo = createMemo(() => signal())
    expect(memo()).eq(false)
    setSignal(true)
    expect(memo()).eq(true)
  })
})

test('memo', () => {
  createRoot(() => {
    const [signal, setSignal] = createSignal(false)
    const memo = createMemo(() => signal())
    expect(memo()).eq(false)
    setSignal(true)
    expect(memo()).eq(true)
  })
})

test('memo', () => {
  createRoot(() => {
    const [signal, setSignal] = createSignal(false)
    const memo = createMemo(() => signal())
    expect(memo()).eq(false)
    setSignal(true)
    expect(memo()).eq(true)
  })
})

Am I missing something?

Testing code without a render function

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