Method mergeReports

packages/vitest/src/node/core.ts:609–646

* Merge reports from multiple runs located in the specified directory (value from `--merge-reports` if not specified).

(directory?: string)

   * Merge reports from multiple runs located in the specified directory (value from `--merge-reports` if not specified).
   */
  public async mergeReports(directory?: string): Promise<TestRunResult> {
    return this._traces.$('vitest.merge_reports', async () => {
      if (this.reporters.some(r => r instanceof BlobReporter)) {
        throw new Error('Cannot merge reports when `--reporter=blob` is used. Remove blob reporter from the config first.')
      }

      const { files, errors, coverages, executionTimes } = await readBlobs(this.version, directory || this.config.mergeReports, this.projects)
      this.state.blobs = { files, errors, coverages, executionTimes }

      await this.report('onInit', this)

      const specifications: TestSpecification[] = []
      for (const file of files) {
        const project = this.getProjectByName(file.projectName || '')
        const specification = project.createSpecification(file.filepath, undefined, file.pool)
        specifications.push(specification)
      }

      await this._testRun.start(specifications)
      await this.coverageProvider?.onTestRunStart?.()

      for (const file of files) {
        await this._reportFileTask(file)
      }

      // append errors thrown during reporter event replay during merge reports
      const unhandledErrors = [...errors, ...this.state.getUnhandledErrors()]
      this._checkUnhandledErrors(unhandledErrors)
      await this._testRun.end(specifications, unhandledErrors)
      await this.initCoverageProvider()
      await this.coverageProvider?.mergeReports?.(coverages)

      return {
        testModules: this.state.getTestModules(),
        unhandledErrors: this.state.getUnhandledErrors(),
      }
    })
  }

  /**
   * Returns the seed, if tests are running in a random order.