Fix expected exception for FontProgramTest#exceptionMessageTest

Changes are caused by
[279206fa18] "Get rid of the pre-check for the font file path" commit.

Autoported commit.
Original commit hash: [76b261370]

Author: yulian-gaponenko

itext.tests/itext.io.tests/itext/io/font/FontProgramTest.cs

@@ -45,17 +45,16 @@ source product.
 
 namespace iText.IO.Font {
     public class FontProgramTest {
+        private const String notExistingFont = "some-font.ttf";
+
         /// <exception cref="System.IO.IOException"/>
         [NUnit.Framework.Test]
         public virtual void ExceptionMessageTest() {
-            String font = "some-font.ttf";
-            try {
-                FontProgramFactory.CreateFont(font);
-            }
-            catch (iText.IO.IOException ex) {
-                NUnit.Framework.Assert.AreEqual(MessageFormatUtil.Format(iText.IO.IOException.FontFile1NotFound, font), ex
-                    .Message);
+            NUnit.Framework.Assert.That(() =>  {
+                FontProgramFactory.CreateFont(notExistingFont);
             }
+            , NUnit.Framework.Throws.TypeOf<System.IO.IOException>().With.Message.EqualTo(MessageFormatUtil.Format("{0} not found as file or resource", notExistingFont)));
+;
         }
 
         /// <exception cref="System.IO.IOException"/>

port-hash

@@ -1 +1 @@
-e0f1a33df0bc5b2ac23be63c7e6ba334f5a8e859
+76b261370b3e1689f7a7ec4eba6025f42ccacf03