Flutter 无法使用 mockito generateMocks 和 json_serializable 生成模拟

如何解决Flutter 无法使用 mockito generateMocks 和 json_serializable 生成模拟

我正在尝试按照此示例 https://flutter.dev/docs/cookbook/testing/unit/mocking 创建 http 单元测试。我使用 json_serializer 在 JSON 和模型之间建立桥梁。我确保这个库启用了空安全

我正在运行的命令是 flutter pub run build_runner build 并且堆栈跟踪很长而且不会停止，看起来像一个永远循环

堆栈跟踪没有我的代码中的确切行，所以不确定从这里开始。

请注意，我没有使用 http 库，因此我提供了 json_serializer 生成的模型

完整输出在这里，我强调了我认为的主要问题

[INFO] Generating build script...
[INFO] Generating build script completed,took 511ms

[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed,took 10.5s

[INFO] There was output on stdout while compiling the build script snapshot,run with `--verbose` to see it (you will need to run a `clean` first to re-snapshot).

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed,took 529ms

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed,took 1ms

[INFO] Running build...
[INFO] Generating SDK summary...
[INFO] 3.3s elapsed,0/8 actions completed.
[INFO] Generating SDK summary completed,took 3.3s

[INFO] 4.4s elapsed,4/8 actions completed.
[INFO] 5.4s elapsed,4/8 actions completed.
[INFO] 13.2s elapsed,7/8 actions completed.
[SEVERE] json_serializable:json_serializable on test/timeline_vm_test.dart:

***Null check operator used on a null value***
#0      LinkedElementFactory.isLibraryUri (package:analyzer/src/summary2/linked_element_factory.dart:418:48)
#1      LibraryContext.isLibraryUri (package:analyzer/src/dart/analysis/library_context.dart:95:27)
#2      LibraryAnalyzer._isLibrarySource (package:analyzer/src/dart/analysis/library_analyzer.dart:511:25)
#3      LibraryAnalyzer._resolveDirectives (package:analyzer/src/dart/analysis/library_analyzer.dart:552:36)
#4      LibraryAnalyzer.analyzeSync (package:analyzer/src/dart/analysis/library_analyzer.dart:128:5)
#5      LibraryAnalyzer.analyze (package:analyzer/src/dart/analysis/library_analyzer.dart:105:12)
#6      AnalysisDriver._computeAnalysisResult.<anonymous closure> (package:analyzer/src/dart/analysis/driver.dart:1590:63)
#7      PerformanceLog.run (package:analyzer/src/dart/analysis/performance_logger.dart:32:15)
#8      AnalysisDriver._computeAnalysisResult (package:analyzer/src/dart/analysis/driver.dart:1565:20)
#9      AnalysisDriver._computeErrors (package:analyzer/src/dart/analysis/driver.dart:1644:26)
#10     AnalysisDriver.performWork (package:analyzer/src/dart/analysis/driver.dart:1266:20)
#11     AnalysisDriverScheduler._run (package:analyzer/src/dart/analysis/driver.dart:2296:24)
<asynchronous suspension>

[INFO] 14.4s elapsed,8/16 actions completed.
[INFO] 15.5s elapsed,8/16 actions completed.
[INFO] 16.6s elapsed,8/16 actions completed.
[INFO] 17.7s elapsed,8/16 actions completed.
[INFO] 18.7s elapsed,8/16 actions completed.
[INFO] 19.8s elapsed,8/16 actions completed.
[INFO] 20.8s elapsed,8/16 actions completed.
[INFO] 21.9s elapsed,8/16 actions completed.
[INFO] 22.9s elapsed,8/16 actions completed.
[INFO] 24.0s elapsed,8/16 actions completed.
[INFO] 25.1s elapsed,8/16 actions completed.
[INFO] 26.1s elapsed,8/16 actions completed.
[INFO] 27.2s elapsed,8/16 actions completed.
[INFO] 28.3s elapsed,8/16 actions completed.
[WARNING] No actions completed for 15.0s,waiting on:
  - mockito:mockBuilder on test/timeline_vm_test.dart
  - mockito:mockBuilder on test/widget_test.dart
  - mockito:mockBuilder on lib/busy_notifier.dart
  - mockito:mockBuilder on lib/main.dart
  - mockito:mockBuilder on lib/data/timeline_vm.dart
  .. and 3 more

解决方法

事实证明我的情况，我所要做的就是删除

#import '../lib/main.dart'

我不确定为什么会这样，但它确实有效。如果我找到它们，我会添加更多细节。