package shared import ( "io" "os" "reflect" "testing" ) func TestFSWrapper_Open(t *testing.T) { rootFs := os.DirFS("/") wrapper := NewFSWrapper(rootFs, "etc/", false) f, err := wrapper.Open("hostname") if err != nil { t.Fatalf("failed to open /etc/hostname: %v", err) } defer f.Close() data, err := os.ReadFile("/etc/hostname") if err != nil { t.Fatalf("failed to read with full path: %v", err) } wrappedData, err := io.ReadAll(f) if err != nil { t.Fatalf("failed to read from wrapped file: %v", err) } if !reflect.DeepEqual(wrappedData, data) { t.Fatal("file contents are different") } }