From 85239638962d142d63a6397a3d9b3e3c79800d15 Mon Sep 17 00:00:00 2001
From: Fr0gN <58360017+Fr0gN@users.noreply.github.com>
Date: Thu, 4 Jul 2024 12:30:57 +0500
Subject: [PATCH] Fixed error 'error importing field: ... unknown prefix:
 None.Fixed for field: ...', related test added (#312)

---
 specs/builder.go      |  1 +
 specs/builder_test.go | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/specs/builder.go b/specs/builder.go
index 32f656f1..259df806 100644
--- a/specs/builder.go
+++ b/specs/builder.go
@@ -31,6 +31,7 @@ var (
 	}
 
 	PrefixesExtToInt = map[string]prefix.Prefixer{
+		"None.Fixed":   prefix.None.Fixed,
 		"ASCII.Fixed":  prefix.ASCII.Fixed,
 		"ASCII.L":      prefix.ASCII.L,
 		"ASCII.LL":     prefix.ASCII.LL,
diff --git a/specs/builder_test.go b/specs/builder_test.go
index 8af45145..87a689f9 100644
--- a/specs/builder_test.go
+++ b/specs/builder_test.go
@@ -248,3 +248,32 @@ func TestSpecWithCompositeBitmapedFields(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, "22004000000000000011 456", string(packed))
 }
+
+func TestExportImportWithNonePrefixField(t *testing.T) {
+	spec := &iso8583.MessageSpec{
+		Fields: map[int]field.Field{
+			3: field.NewComposite(&field.Spec{
+				Description: "Processing code",
+				Pref:        prefix.None.Fixed,
+				Tag: &field.TagSpec{
+					Enc:  encoding.ASCII,
+					Sort: sort.StringsByInt,
+				},
+				Subfields: map[string]field.Field{
+					"1": field.NewNumeric(&field.Spec{
+						Length:      3,
+						Description: "Transaction code",
+						Enc:         encoding.ASCII,
+						Pref:        prefix.ASCII.Fixed,
+					}),
+				},
+			}),
+		},
+	}
+
+	specJSON, err := Builder.ExportJSON(spec)
+	require.NoError(t, err)
+
+	spec, err = Builder.ImportJSON(specJSON)
+	require.NoError(t, err)
+}