Add missing copyright headers

Autoported commit.
Original commit hash: [e23ed220b]

Author: iText-CI

itext.tests/itext.layout.tests/itext/layout/StyleUnitTest.cs

@@ -1,3 +1,25 @@
+/*
+This file is part of the iText (R) project.
+Copyright (c) 1998-2020 iText Group NV
+Authors: iText Software.
+
+This program is offered under a commercial and under the AGPL license.
+For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.
+
+AGPL licensing:
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
 using iText.Layout.Properties;
 using iText.Test;
 

port-hash

@@ -1 +1 @@
-6fb855ee5f74afc17726c2a9d459a3deaba95b02
+e23ed220bbad999604f341ec8a97594a7a47f8b7