Method splitTestsByGroups

lib/workers.js:333–350

* This splits tests by groups. * Strategy for group split is taken from a constructor's config.by value: * * `config.by` can be: * * - `suite` * - `test` * - `pool` * - function(numberOfWorkers) * * This method can be overridden for a better split.

(numberOfWorkers, config)

   * This method can be overridden for a better split.
   */
  splitTestsByGroups(numberOfWorkers, config) {
    if (isFunction(config.by)) {
      const createTests = config.by
      const testGroups = createTests(numberOfWorkers)
      if (!(testGroups instanceof Array)) {
        throw new Error('Test group should be an array')
      }
      for (const testGroup of testGroups) {
        this.testGroups.push(convertToMochaTests(testGroup))
      }
    } else if (typeof numberOfWorkers === 'number' && numberOfWorkers > 0) {
      if (config.by === 'pool') {
        this.createTestPool(numberOfWorkers)
      } else {
        this.testGroups = config.by === 'suite' ? this.createGroupsOfSuites(numberOfWorkers) : this.createGroupsOfTests(numberOfWorkers)
      }
    }
  }

  /**
   * Creates a new worker