HarmonyOS 在单元测试中如何引入context

export class CustomAbilityUtil { 
  static context: common.UIAbilityContext 
  static uint8Array2string(uData: Uint8Array, encoding: string = 'utf8', tOption?: util.TextDecoderOptions, 
    dOption?: util.DecodeWithStreamOptions): string { 
    return util.TextDecoder.create(encoding, tOption).decodeWithStream(uData, dOption) 
  } 
}

it('assertContain3', 0, () => { 
  // Defines a test case. This API supports three parameters: test case name, filter parameter, and test case function. 
  hilog.info(0x0000, 'testTag', '%{public}s', 'it begin3333'); 
  let uArray = CustomAbilityUtil.context.resourceManager.getRawFileContentSync('test/test.txt') 
  let result = CustomAbilityUtil.uint8Array2string(uArray) 
  hilog.info(0x00000, TAG, 'result#' + result); 
  hilog.info(0x0000, 'testTag', '%{public}s', 'it end33333'); 
})