diff --git a/ledger/delta.go b/ledger/delta.go
index 019b206..1ea0252 100644
--- a/ledger/delta.go
+++ b/ledger/delta.go
@@ -1,5 +1,7 @@
 package ledger
 
+import "fmt"
+
 type Currency string
 
 const (
@@ -32,3 +34,7 @@ func (delta Delta) Plus(other Delta) Delta {
 		Currency: other.Currency,
 	}
 }
+
+func (delta Delta) Debug() string {
+	return fmt.Sprintf("{@%s %s:\"%s\" %.2f %s}", delta.Date, delta.Account, delta.Description, delta.Value, delta.Currency)
+}
diff --git a/ledger/file_test.go b/ledger/file_test.go
index ce05c99..3aed830 100644
--- a/ledger/file_test.go
+++ b/ledger/file_test.go
@@ -3,10 +3,35 @@ package ledger
 import (
 	"fmt"
 	"io"
+	"path/filepath"
 	"strings"
 	"testing"
 )
 
+func TestFileTestdata(t *testing.T) {
+	paths, err := filepath.Glob("./testdata/*")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, pathd := range paths {
+		path := pathd
+		t.Run(path, func(t *testing.T) {
+			f, err := NewFile(path)
+			if err != nil {
+				t.Fatal(err)
+			}
+			transactions, err := f.Deltas()
+			if err != nil {
+				t.Fatal(err)
+			}
+			for i := range transactions {
+				t.Logf("%+v", transactions[i].Debug())
+			}
+		})
+	}
+}
+
 func TestFileDeltas(t *testing.T) {
 	happy := []Delta{
 		{
@@ -66,7 +91,7 @@ func TestFileDeltas(t *testing.T) {
 					break
 				}
 				if want[i] != deltas[i] {
-					t.Errorf("[%d] \n\twant=%+v, \n\t got=%+v", i, want[i], deltas[i])
+					t.Errorf("[%d] \n\twant=%s, \n\t got=%s", i, want[i].Debug(), deltas[i].Debug())
 				}
 			}
 		})