Karma measure each spec elapsed time

In this case I have an angular app and I noticed that some of the test specs are slower than others. I tried writing simple time reporter:

function SpecTimingReporter(baseReporterDecorator, config, logger) {
baseReporterDecorator(this);

const log = logger.create('spec-timing-reporter');
this.startTime = 0;

this.onSpecStart = function (spec) {
this.startTime = Date.now(); // Record the start time when a spec starts
};

this.onSpecComplete = function (browser, result) {
const elapsedTime = Date.now() - this.startTime; // Calculate elapsed time
log.info(`Spec "${result.description}" took ${elapsedTime} ms to complete.`);
};
}


but the problem is that onSpecStart is not triggered. I searched for some documention but couldn't find anything helpful. Is there some "start" event for each spec?

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