Method mkdir

packages/testlab/src/test-sandbox.ts:122–124

* Makes a directory in the TestSandbox * * @param dir - Name of directory to create (relative to TestSandbox path)

(dir: string)

   * @param dir - Name of directory to create (relative to TestSandbox path)
   */
  async mkdir(dir: string): Promise<void> {
    await ensureDir(resolve(this.path, dir));
  }

  /**
   * Copies a file from src to the TestSandbox. If copying a `.js` file which