fix: make automocking aware of symbol indexed methods

[eleith]

this PR intends to resolve #1082 by updating automocking to fully support symbol indexed methods (specifically, fixing the root issue which occurs when trying to restore and later use such methods)

caveat

in a fresh project, i can get the below test snippet to fail for vitest@0.9.0. i can then get them to pass when linking vitest locally to this branch. however, when running the tests in examples/mocks, the below tests fail as the mock is not properly restored.

local testing

in a fresh project, the following will fail for v0.9.0 and pass on this PR

in log.ts

const sym = Symbol('x')

const logger = {
  warn() {
    return this[sym]()
  },
  [sym]() {
    return 'hello'
  }
}

export default logger

and in log.test.ts

import { vi, test, expect } from 'vitest'
import logger from './log'

vi.mock('./log')

test('auto mocked', () => {
  expect(logger.warn()).toBeUndefined()
})

test('restoring auto mock', () => {
  vi.restoreAllMocks()
  expect(logger.warn()).toBe('hello')
})

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[eleith]

@antfu could you push a new updated build to tinyspy?

i can confirm when installing locally that v0.3.1 does not include your latest changes for symbol support.

[sheremet-va]

@antfu could you push a new updated build to tinyspy?

i can confirm when installing locally that v0.3.1 does not include your latest changes for symbol support.

released in 0.3.2

[eleith]

on both windows and in a clean project directory (even linux) all tests in this PR pass with only a single call to vi.restoreAllMocks()

however when running tests in examples/mocks on linux (14.x and 16.x) the tests in this PR will fail unless the auto mocks are manually restored by calling .mockRestore()

when inspecting the value of spies in the internals of vi.restoreAllMocks, in a failed test run, it is incorrectly an empty Set().

in a successful test run, spies is a full Set() of all automocks.