https://github.com/caarlos0/testfs

A simple fs.FS implementation to be used inside tests.
https://github.com/caarlos0/testfs

filesystem golang testing

Last synced: about 7 hours ago
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A simple fs.FS implementation to be used inside tests.

• Host: GitHub
• URL: https://github.com/caarlos0/testfs
• Owner: caarlos0
• License: mit
• Created: 2021-02-04T21:21:26.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2023-06-14T13:38:05.000Z (over 1 year ago)
• Last Synced: 2024-06-18T20:24:25.866Z (4 months ago)
• Topics: filesystem, golang, testing
• Language: Go
• Homepage:
• Size: 22.5 KB
• Stars: 33
• Watchers: 2
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# testfs

A simple `fs.FS` which is contained in a test (using `testing.TB`'s `TempDir()`)

and with a few helper methods.

PS: This lib only works on Go 1.16+.

## Example

```go

func TestSomething(t *testing.T) {

	tmpfs := testfs.New(t)

	testfile := "foo/bar/foobar"

	_ = tmpfs.MkdirAll(filepath.Dir(testfile), 0o764)

	_ = tmpfs.WriteFile(testfile, []byte("example"), 0o644)

	// you can now use tmpfs as a fs.FS...

	// fs.WalkDir(tmpfs, ".", func(path string, d fs.DirEntry, err error) error { return nil })

	// and read files of course:

	bts, _ := fs.ReadFile(tmpfs, testfile)

	fmt.Println(string(bts))

}

```

## Why

The idea is to able to test code that use a `fs.FS`, without having to,

for example, commit a bunch of files inside `testdata` and without using

in-memory implementation that might not do the same thing as a real FS.

This is a real FS, it only limits itself to a temporary directory and

cleans after itself once the test is done. You also get a couple of helper

methods to create the structure you need.

## Other options

If you don't mind testing against an in-memory implementation, the native

`fstest.MemFS` is a good option.