Ember-qunit Unit test failed with Global error Ajax aborted

Does anyone meet this issue before? I am running a unit test for ember-qunit from my local, get this global error, and the Ajax was aborted. Thanks!

ok 1 Chrome 92.0 - [1 ms] - ESLint | app: services/something.js
ok 2 Chrome 92.0 - [0 ms] - ESLint | tests: unit/services/something-test.js
not ok 3 Chrome 92.0 - [undefined ms] - Global error: Uncaught Error: The ajax operation was aborted at http://localhost:7357/assets/vendor.js, line 36784
 While executing test: Unit | Service | something: should correctly concat foo
    ---
        browser log: |
            testContext: [object Object]
            ERROR: Uncaught Error: The ajax operation was aborted at http://localhost:7357/assets/vendor.js, line 36784

    ...
not ok 4 Chrome - [undefined ms] - error
    ---
        message: >
            Error: Browser timeout exceeded: 10s
            Error while executing test: Unit | Service | something: should correctly concat foo
            Stderr:

            DevTools listening on ws://127.0.0.1:9222/devtools/browser/53946c78-c3da-4f52-9744-bd71040066fc


        browser log: |
            [object Object]
            [object Object]
            [object Object]
    ...

1..4
# tests 4
# pass  2
# skip  0
# fail  2
Testem finished with non-zero exit code. Tests failed.