During the jest test, I encountered a timeout error indicating that the test exceeded the 5000 ms limit

Here is the specific code snippet causing the issue:

    export const initializeSpotifySDK = async (token: string, trackId: string, contextUri: string, playbackStateChangeHandler: (state) => void, errorHandler: (message: string) => void): Promise<SpotifyPlayer> => {
      embedSpotifyScript();
    
      return new Promise(resolve => {
        window.onSpotifyWebPlaybackSDKReady = () => {
          try {
            // @ts-ignore
            const player = new Spotify.Player({
              name: 'Mira',
              getOAuthToken: callback => { callback(token); }
            });
    
            // Error handling - pass an error handler!!!
            player.addListener('initialization_error', ({ message }) => {
              errorHandler(message);
            });
            player.addListener('authentication_error', ({ message }) => {
              errorHandler(message);
            });
            player.addListener('account_error', ({ message }) => {
              errorHandler(message);
            });
            player.addListener('playback_error', ({ message }) => {
              errorHandler(message);
            });
    
            // Playback state handler - pass a handler as well!!!
            player.addListener('player_state_changed', state => { playbackStateChangeHandler(state); });
    
            player.addListener('ready', ({ device_id }) => {
              const spotifyPlayer = new SpotifyPlayer(player, device_id, trackId, contextUri, token, true);
              resolve(spotifyPlayer);
            });
    
            player.addListener('not_ready', ({ device_id }) => {
              const spotifyPlayer = new SpotifyPlayer(player, device_id, trackId, contextUri, token, false);
              resolve(spotifyPlayer);
            });
    
            player.connect();
          } catch (err) {
            logError(err);
            resolve(new SpotifyPlayer(null, '', '', token, '', false));
          }
        };
      });
    };

This is the test case for it:

it('should set up the Spotify SDK and provide a SpotifyPlayer instance', async () => {
    const token = 'abc123';
    const trackId = '123';
    const contextUri = 'spotify:album:456';
    const playbackStateChangeHandler = jest.fn();
    const errorHandler = jest.fn();

    const spotifyPlayer = await initializeSpotifySDK(
      token,
      trackId,
      contextUri,
      playbackStateChangeHandler,
      errorHandler
    );

    console.log({ spotifyPlayer });

    expect(spotifyPlayer).toBeInstanceOf(SpotifyPlayer);
    expect(spotifyPlayer.deviceId).toBeDefined();
    expect(spotifyPlayer.trackId).toEqual(trackId);
    expect(spotifyPlayer.contextUri).toEqual(contextUri);
    expect(spotifyPlayer.token).toEqual(token);
  });

The complete error message:

    ✕ should set up the Spotify SDK and provide a SpotifyPlayer instance (5003 ms)

  ● spotifySdkService › should set up the Spotify SDK and provide a SpotifyPlayer instance

    thrown: "Exceeded timeout of 5000 ms for a test.
    Use jest.setTimeout(newTimeout) to increase the timeout value, if this is a long-running test."

      108 |   });
      109 |
    > 110 |   it('should set up the Spotify SDK and provide a SpotifyPlayer instance', async () => {
          |   ^
      111 |     const token = 'abc123';
      112 |     const trackId = '123';
      113 |     const contextUri = 'spotify:album:456';

      at services/spotifySdkService.spec.ts:110:3
      at Object.<anonymous> (services/spotifySdkService.spec.ts:17:1)
      at TestScheduler.scheduleTests (../node_modules/@jest/core/build/TestScheduler.js:333:13)
      at runJest (../node_modules/@jest/core/build/runJest.js:404:19)
      at _run10000 (../node_modules/@jest/core/build/cli/index.js:320:7)
      at runCLI (../node_modules/@jest/core/build/cli/index.js:173:3)

Can anyone offer insight into what might be going wrong here?

Answer №1

The error message is indicating the root cause of the problem: the code being tested is exceeding the 5-second time limit, especially when it involves making an internet request.

  1. To troubleshoot, follow the error's advice and confirm that your test runs successfully, even if it's slow:

    jest.setTimeout(60000) // set to one minute
    
  2. If the initial adjustment fails, increase the timeout to 5 minutes and retest (and be patient).

    If successful or not, you can pinpoint the bottleneck by adding timing checks around sections likely causing delays:

    const start = Date.now()
    console.log(`starting...`)
    player.connect()
    console.log(`elapsed time: ${Date.now() - start}`)
    
  3. If "starting..." appears but not the elapsed time, there may be a hang within that block of code.

  4. If you don't see "starting..." at all, jest might be suppressing logs or the delay occurs earlier than expected.

    • Run your function in a basic script bypassing jest for clarity on the issue's origin.

    • If "starting..." remains invisible, move these lines:

      const start = Date.now()
      console.log(`starting...`)
      

      to the beginning of your function.

    • If still no luck, review other potential mistakes.

  5. If the elapsed time exceeds 5000, focus on isolating the problematic line by adjusting the timing statements. For a specific function call causing delays, relocate the timing indicators internally for targeted investigation.

It is likely that player.connect() is responsible for the delay, which could be normal given network constraints or authentication issues with Spotify queries.

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