How to Abstract and Mock the Filesystem in Go for Testing and Logging?

How to Abstract and Mock the Filesystem in Go

For comprehensive logging of read and write operations in your Go application, or the complete replacement of the filesystem with an in-memory alternative, you can leverage the following techniques:

Abstraction

To abstract the filesystem, define an interface that represents its core operations:

The osFS implementation of fileSystem works with the local disk:

Usage

To use the abstracted filesystem, pass a fileSystem instance to your code:

Mocking

To mock the filesystem, implement the fileSystem interface with a custom implementation that provides controlled behavior for testing or logging:

By passing the MockFileSystem to your code, you can verify and control the filesystem operations invoked during testing.

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