node/lib/internal/test_runner/reporter/spec.js

'use strict';

const {
  ArrayPrototypeJoin,
  ArrayPrototypePop,
  ArrayPrototypePush,
  ArrayPrototypeShift,
  ArrayPrototypeUnshift,
  hardenRegExp,
  RegExpPrototypeSymbolSplit,
  SafeMap,
  StringPrototypeRepeat,
} = primordials;
const assert = require('assert');
const Transform = require('internal/streams/transform');
const { inspectWithNoCustomRetry } = require('internal/errors');
const { green, blue, red, white, gray } = require('internal/util/colors');


const inspectOptions = { __proto__: null, colors: true, breakLength: Infinity };

const colors = {
  '__proto__': null,
  'test:fail': red,
  'test:pass': green,
  'test:diagnostic': blue,
};
const symbols = {
  '__proto__': null,
  'test:fail': '\u2716 ',
  'test:pass': '\u2714 ',
  'test:diagnostic': '\u2139 ',
  'arrow:right': '\u25B6 ',
  'hyphen:minus': '\uFE63 ',
};
class SpecReporter extends Transform {
  #stack = [];
  #reported = [];
  #indentMemo = new SafeMap();
  #failedTests = [];

  constructor() {
    super({ writableObjectMode: true });
  }

  #indent(nesting) {
    let value = this.#indentMemo.get(nesting);
    if (value === undefined) {
      value = StringPrototypeRepeat('  ', nesting);
      this.#indentMemo.set(nesting, value);
    }

    return value;
  }
  #formatError(error, indent) {
    if (!error) return '';
    const err = error.code === 'ERR_TEST_FAILURE' ? error.cause : error;
    const message = ArrayPrototypeJoin(
      RegExpPrototypeSymbolSplit(
        hardenRegExp(/\r?\n/),
        inspectWithNoCustomRetry(err, inspectOptions),
      ), `\n${indent}  `);
    return `\n${indent}  ${message}\n`;
  }
  #formatTestReport(type, data, prefix = '', indent = '', hasChildren = false, skippedSubtest = false) {
    let color = colors[type] ?? white;
    let symbol = symbols[type] ?? ' ';
    const duration_ms = data.details?.duration_ms ? ` ${gray}(${data.details.duration_ms}ms)${white}` : '';
    const title = `${data.name}${duration_ms}${skippedSubtest ? ' # SKIP' : ''}`;
    if (hasChildren) {
      // If this test has had children - it was already reported, so slightly modify the output
      return `${prefix}${indent}${color}${symbols['arrow:right']}${white}${title}\n`;
    }
    const error = this.#formatError(data.details?.error, indent);
    if (skippedSubtest) {
      color = gray;
      symbol = symbols['hyphen:minus'];
    }
    return `${prefix}${indent}${color}${symbol}${title}${white}${error}`;
  }
  #handleTestReportEvent(type, data) {
    const subtest = ArrayPrototypeShift(this.#stack); // This is the matching `test:start` event
    if (subtest) {
      assert(subtest.type === 'test:start');
      assert(subtest.data.nesting === data.nesting);
      assert(subtest.data.name === data.name);
    }
    let prefix = '';
    while (this.#stack.length) {
      // Report all the parent `test:start` events
      const parent = ArrayPrototypePop(this.#stack);
      assert(parent.type === 'test:start');
      const msg = parent.data;
      ArrayPrototypeUnshift(this.#reported, msg);
      prefix += `${this.#indent(msg.nesting)}${symbols['arrow:right']}${msg.name}\n`;
    }
    let hasChildren = false;
    if (this.#reported[0] && this.#reported[0].nesting === data.nesting && this.#reported[0].name === data.name) {
      ArrayPrototypeShift(this.#reported);
      hasChildren = true;
    }
    const skippedSubtest = subtest && data.skip && data.skip !== undefined;
    const indent = this.#indent(data.nesting);
    return `${this.#formatTestReport(type, data, prefix, indent, hasChildren, skippedSubtest)}\n`;
  }
  #handleEvent({ type, data }) {
    switch (type) {
      case 'test:fail':
        ArrayPrototypePush(this.#failedTests, data);
        return this.#handleTestReportEvent(type, data);
      case 'test:pass':
        return this.#handleTestReportEvent(type, data);
      case 'test:start':
        ArrayPrototypeUnshift(this.#stack, { __proto__: null, data, type });
        break;
      case 'test:diagnostic':
        return `${colors[type]}${this.#indent(data.nesting)}${symbols[type]}${data.message}${white}\n`;
    }
  }
  _transform({ type, data }, encoding, callback) {
    callback(null, this.#handleEvent({ type, data }));
  }
  _flush(callback) {
    const results = [`\n${colors['test:fail']}${symbols['test:fail']}failing tests:${white}\n`];
    for (let i = 0; i < this.#failedTests.length; i++) {
      ArrayPrototypePush(results, this.#formatTestReport(
        'test:fail',
        this.#failedTests[i],
      ));
    }
    callback(null, ArrayPrototypeJoin(results, '\n'));
  }
}

module.exports = SpecReporter;