Testably.Abstractions.Testing 3.2.3

This library contains the testing helpers for Testably.Abstractions.

MockFileSystem

Initialization

Shows how to initialize the file system:

    fileSystem.InitializeIn("current-directory")
        .WithASubdirectory()
        .WithSubdirectory("foo").Initialized(s => s
            .WithAFile())
        .WithFile("bar.txt");

Initialize the file system in "current-directory" with

• a randomly named directory
• a directory named "foo" which contains a randomly named file
• a file named "bar.txt"

In order to use multiple drives on Windows (or network shares) you have to first register them:

    fileSystem.WithDrive(@"D:", drive => drive.SetTotalSize(1024));

The optional configuration allows limiting the maximum available space on the drive.

Events

All changes in the file system trigger certain events. All events can be

• intercepted, before they occur (and e.g. an exception thrown to prevent the event from completing) on the Intercept property:

      MockFileSystem fileSystem = new();
          fileSystem.Intercept.Creating(FileSystemTypes.File,
              _ => throw new Exception("my custom exception"));
  

• notified, after they occured to allow a test to react to changes on the MockFileSystem.Notify property: These methods return an awaitable object that
  • Removes the notification on dispose
  • Provides a blocking mechanism until the notification happens

      MockFileSystem fileSystem = new();
      fileSystem.Notify
          .OnCreated(FileSystemTypes.File, _ =>
          {
              // Do something
          })
          .ExecuteWhileWaiting(() =>
          {
              // This will trigger the callback
              fileSystem.File.Create("some-file.txt");
          })
          .Wait();