add test for showing jbig2 support

graphics-pdfbox/src/test/java/org/xbib/graphics/pdfbox/test/JBig2Test.java

@@ -0,0 +1,20 @@
+package org.xbib.graphics.pdfbox.test;
+
+import org.junit.jupiter.api.Test;
+
+import javax.imageio.ImageIO;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class JBig2Test {
+
+    private static final Logger logger = Logger.getLogger(JBig2Test.class.getName());
+
+    @Test
+    public void checkPlugins() {
+        ImageIO.scanForPlugins();
+        for (String suffix : ImageIO.getReaderFileSuffixes()) {
+            logger.log(Level.INFO, "ImageIO suffix: " + suffix);
+        }
+    }
+}