fix(cache): Store memory cache in global

[zharinov]

Changes

There is annoying behavior of module-level variables being reset during testing.

Sometimes, proper testing requires manipulating memory cache, so we need to initialize and use it, but then we may realize it's always undefined no matter what (probably due to some Jest behavior).

This PR moves the variable to the global level, which seems to fix the problem.

Context

• Ref: feat(gitea): Add PR cache #26451

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[viceice]

I don't like this workaround. will investigate what happens

[zharinov]

Thank you. I think you could reproduce it on the gitea branch.

What I've tried is to adding following to the test/setup.ts:

jest.mock('../lib/util/cache/memory', () => {
  let repoCache: Record<string, any> | undefined = undefined;

  return {
    init(): void {
      repoCache = {};
    },

    reset(): void {
      repoCache = undefined;
    },

    get<T = any>(key: string): T {
      return repoCache?.[key];
    },

    set(key: string, value: unknown): void {
      if (repoCache) {
        repoCache[key] = value;
      }
    },
  };
});

But this didn't work 🤷‍♂️

[viceice]

closing, i've fixed your tests on #26451 😉