无法添加测试包pub升级失败（1）

Question

我正在尝试添加测试包，但失败了

Because every version of flutter_test from sdk depends on test_api 0.2.4 and test >=1.6.4 depends on test_api 0.2.6, flutter_test from sdk is incompatible with test >=1.6.4.
So, because ride_app depends on both test 1.6.4 and flutter_test any from sdk, version solving failed.

Pubspec

dev_dependencies:
  test: 1.6.4
  flutter_test:
    sdk: flutter