Add the setting changes encoding for CSV file to the preference dialog

(cherry picked from commit 11210b6d8b4584621ef02e7356854ffa9f7f2647)

src/test/java/ninja/javafx/smartcsv/preferences/CharsetHelperTest.java

@@ -0,0 +1,56 @@
+/*
+   The MIT License (MIT)
+   -----------------------------------------------------------------------------
+
+   Copyright (c) 2015-2016 javafx.ninja <info@javafx.ninja>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+
+*/
+
+package ninja.javafx.smartcsv.preferences;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class CharsetHelperTest {
+
+    @Test
+    public void getCharsetName_known_charset() {
+        String result = CharsetHelper.getCharsetName("UTF-16");
+        assertEquals(StandardCharsets.UTF_16.name(), result);
+    }
+
+    @Test
+    public void getCharsetName_unknown_charset() {
+        String result = CharsetHelper.getCharsetName("foobar");
+        assertEquals(StandardCharsets.UTF_8.name(), result);
+    }
+
+    @Test
+    public void getCharsetName_null_charset() {
+        String result = CharsetHelper.getCharsetName(null);
+        assertEquals(StandardCharsets.UTF_8.name(), result);
+    }
+
+}