[credential-provider-imds]: unit tests are failing in Node.js v20.3.0

[trivikr]

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• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow.
• I've searched for previous similar issues and didn't find any solution.

Describe the bug

The unit tests of credential-provider-imds throw the following error in Node.js v20.3.0:

    Expected: [SyntaxError: Unexpected token . in JSON at position 0]
    Received: [SyntaxError: Unexpected token '.', "." is not valid JSON]

This may or may not have impact SDK usage. The unit test needs to be fixed.

SDK version number

main

Which JavaScript Runtime is this issue in?

Node.js

Details of the browser/Node.js/ReactNative version

v20.3.0

Reproduction Steps

Run unit tests in credential-provider-imds

Observed Behavior

$ credential-provider-imds> yarn test
...
 FAIL  src/fromInstanceMetadata.spec.ts
  ● fromInstanceMetadata › throws SyntaxError if httpRequest returns unparseable creds

    expect(received).rejects.toEqual(expected) // deep equality

    Expected: [SyntaxError: Unexpected token . in JSON at position 0]
    Received: [SyntaxError: Unexpected token '.', "." is not valid JSON]

      182 |     (retry as jest.Mock).mockImplementation((fn: any) => fn());
      183 |
    > 184 |     await expect(fromInstanceMetadata()()).rejects.toEqual(new SyntaxError("Unexpected token . in JSON at position 0"));
          |                                                    ^
      185 |     expect(retry).toHaveBeenCalledTimes(2);
      186 |     expect(httpRequest).toHaveBeenCalledTimes(3);
      187 |     expect(fromImdsCredentials).not.toHaveBeenCalled();

      at Object.toEqual (../../node_modules/expect/build/index.js:241:22)
      at src/fromInstanceMetadata.spec.ts:184:52
      at src/fromInstanceMetadata.spec.ts:8:71
      at Object.<anonymous>.__awaiter (src/fromInstanceMetadata.spec.ts:4:12)
      at Object.<anonymous> (src/fromInstanceMetadata.spec.ts:177:80)

 PASS  src/config/EndpointConfigOptions.spec.ts
A worker process has failed to exit gracefully and has been force exited. This is likely caused by tests leaking due to improper teardown. Try running with --detectOpenHandles to find leaks. Active timers can also cause this, ensure that .unref() was called on them.

Test Suites: 1 failed, 10 passed, 11 total
Tests:       1 failed, 74 passed, 75 total
Snapshots:   0 total
Time:        4.943 s
Ran all test suites.
error Command failed with exit code 1.

Expected Behavior

$ credential-provider-imds> yarn test
...
Test Suites: 11 passed, 11 total
Tests:       75 passed, 75 total
Snapshots:   0 total
Time:        4.505 s, estimated 5 s
Ran all test suites.
✨  Done in 5.04s.

Possible Solution

No response

Additional Information/Context

No response

[trivikr]

This happens as SyntaxError message has changed in Node.js 20.x

Node.js <=18.x

Welcome to Node.js v18.16.0.
Type ".help" for more information.
> JSON.parse(".")
Uncaught SyntaxError: Unexpected token . in JSON at position 0

Node.js 20.x

Welcome to Node.js v20.3.0.
Type ".help" for more information.
> JSON.parse(".")
Uncaught SyntaxError: Unexpected token '.', "." is not valid JSON

[github-actions]

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