Rename filesystem interfaces and structs

server/internal/storage/filesystem_test.go

@@ -0,0 +1,46 @@
+package storage_test
+
+import (
+	"io/fs"
+	"os"
+	"testing/fstest"
+)
+
+// mapFS adapts testing.MapFS to implement our fileSystem interface
+type mapFS struct {
+	fstest.MapFS
+}
+
+func NewMapFS() *mapFS {
+	return &mapFS{
+		MapFS: make(fstest.MapFS),
+	}
+}
+
+// Only implement the methods that MapFS doesn't already provide
+func (m *mapFS) WriteFile(path string, data []byte, perm fs.FileMode) error {
+	m.MapFS[path] = &fstest.MapFile{
+		Data: data,
+		Mode: perm,
+	}
+	return nil
+}
+
+func (m *mapFS) Remove(path string) error {
+	delete(m.MapFS, path)
+	return nil
+}
+
+func (m *mapFS) MkdirAll(_ string, _ fs.FileMode) error {
+	// For MapFS, we don't actually need to create directories
+	return nil
+}
+
+func (m *mapFS) RemoveAll(path string) error {
+	delete(m.MapFS, path)
+	return nil
+}
+
+func (m *mapFS) IsNotExist(err error) bool {
+	return os.IsNotExist(err)
+}