我的测试无法在我的 Flutter 项目引用的仅 Dart 项目中编译和运行。我收到以下错误消息
\nFailed to precompile test:test:\n../../../../../../../../../.pub-cache/hosted/pub.dartlang.org/analyzer-1.0.0/lib/src/error/best_practices_verifier.dart:1952:14: Error: A non-null value must be returned since the return type \'String\' doesn\'t allow null.\n String get displayString {\nRun Code Online (Sandbox Code Playgroud)\n有什么想法吗?
\nFlutter 2.2.1 (current stable channel)\nTools \xe2\x80\xa2 Dart 2.13.1\nRun Code Online (Sandbox Code Playgroud)\n(我也在 Flutter 的 github 中提出了这个问题)\n https://github.com/flutter/flutter/issues/83683
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