chore: added memoryFS used by some adapter tests

Signed-off-by: William Artero <git@artero.dev>

internal/test/memoryfs.go

@@ -0,0 +1,82 @@
+package test
+
+import (
+	"bytes"
+	"fmt"
+	"io/fs"
+	"path/filepath"
+	"time"
+)
+
+type MemoryFS map[string][]byte
+
+func (mfs MemoryFS) Open(path string) (fs.File, error) {
+	data, ok := mfs[path]
+	if !ok {
+		return nil, fmt.Errorf("file not found")
+	}
+
+	return &MemoryFile{
+		name:    filepath.Base(path),
+		content: bytes.NewBuffer(data),
+	}, nil
+}
+
+type MemoryFile struct {
+	closed  bool
+	mode    fs.FileMode
+	modTime time.Time
+
+	name    string
+	content *bytes.Buffer
+}
+
+func (fd *MemoryFile) Stat() (fs.FileInfo, error) {
+	return fd, nil
+}
+
+func (fd *MemoryFile) Read(b []byte) (int, error) {
+	if fd.closed {
+		return 0, fs.ErrClosed
+	}
+
+	if fd.content == nil {
+		return 0, fs.ErrInvalid
+	}
+
+	return fd.content.Read(b)
+}
+
+func (fd *MemoryFile) Close() error {
+	if fd.closed {
+		return fs.ErrClosed
+	}
+
+	fd.closed = true
+
+	return nil
+}
+
+func (fd *MemoryFile) Name() string {
+	return fd.name
+}
+
+func (fd *MemoryFile) Size() int64 {
+	return int64(fd.content.Len())
+}
+
+func (fd *MemoryFile) Mode() fs.FileMode {
+	return fd.mode
+}
+
+func (fd *MemoryFile) ModTime() time.Time {
+	return fd.modTime
+}
+
+func (fd *MemoryFile) IsDir() bool {
+	return false
+}
+
+func (fd *MemoryFile) Sys() any {
+	return nil
+}