test_runner: add level-based diagnostic handling for reporter

[hpatel292-seneca]

This fixes #55922

Change summary

Updated the reporter.diagnostic to accept level parameter like this

  diagnostic(nesting, loc, message, level = 'info') {
    this[kEmitMessage]('test:diagnostic', {
      __proto__: null,
      nesting,
      message,
      level,
      ...loc,
    });
  }

Then I updated #handleEvent like this

 #handleEvent({ type, data }) {
    switch (type) {
      case 'test:fail':
        if (data.details?.error?.failureType !== kSubtestsFailed) {
          ArrayPrototypePush(this.#failedTests, data);
        }
        return this.#handleTestReportEvent(type, data);
      case 'test:pass':
        return this.#handleTestReportEvent(type, data);
      case 'test:start':
        ArrayPrototypeUnshift(this.#stack, { __proto__: null, data, type });
        break;
      case 'test:stderr':
      case 'test:stdout':
        return data.message;
      case 'test:diagnostic':  // Here I added logic
        const diagnosticColor =
          reporterColorMap[data.level] || reporterColorMap['test:diagnostic'];
        return `${diagnosticColor}${indent(data.nesting)}${
          reporterUnicodeSymbolMap[type]
        }${data.message}${colors.white}\n`;
      case 'test:coverage':
        return getCoverageReport(
          indent(data.nesting),
          data.summary,
          reporterUnicodeSymbolMap['test:coverage'],
          colors.blue,
          true
        );
    }
  }

And I am Updated reporterColorMap like this

const reporterColorMap = {
  __proto__: null,
  get 'test:fail'() {
    return colors.red;
  },
  get 'test:pass'() {
    return colors.green;
  },
  get 'test:diagnostic'() {
    return colors.blue;
  },
  get info() { // Here I added logic
    return colors.blue;
  },
  get debug() { 
    return colors.gray;
  },
  get warn() { 
    return colors.yellow;
  },
  get error() { 
    return colors.red;
  },
};

and color already contain logic for this colors

I also set the reporter.diagnostic call from test.js like this (level="Error")

if (actual < threshold) {
            harness.success = false;
            process.exitCode = kGenericUserError;
            reporter.diagnostic(
              nesting,
              loc,
              `Error: ${NumberPrototypeToFixed(
                actual,
                2
              )}% ${name} coverage does not meet threshold of ${threshold}%.`,
              'error'  // Level is set to error for red color
            );
          }

Here is Demo output: