Many unittests for internal folder

internal/misc/mime_test.go

@@ -0,0 +1,28 @@
+// This file is Free Software under the MIT License
+// without warranty, see README.md and LICENSES/MIT.txt for details.
+//
+// SPDX-License-Identifier: MIT
+//
+// SPDX-FileCopyrightText: 2023 German Federal Office for Information Security (BSI) <https://www.bsi.bund.de>
+// Software-Engineering: 2023 Intevation GmbH <https://intevation.de>
+
+package misc
+
+import (
+	"testing"
+	"bytes"
+	"mime/multipart"
+)
+
+
+// CreateFormFile creates an [io.Writer] like [mime/multipart.Writer.CreateFromFile].
+// This version allows to set the mime type, too.
+func TestCreateFormFile( t *testing.T)  {
+	body := new(bytes.Buffer)
+	writer := multipart.NewWriter(body)
+	
+	_, err := CreateFormFile(writer, "csaf", "data", "application/json")
+	if err != nil {
+		t.Errorf("failed to create an io.Writer via CreateFormFile")
+	}
+}