Index: trunk/test/unit/org/openstreetmap/josm/io/protocols/data/HandlerTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/io/protocols/data/HandlerTest.java	(revision 10931)
+++ trunk/test/unit/org/openstreetmap/josm/io/protocols/data/HandlerTest.java	(revision 10931)
@@ -0,0 +1,47 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.io.protocols.data;
+
+import static org.junit.Assert.assertNotNull;
+
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLConnection;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.openstreetmap.josm.testutils.JOSMTestRules;
+
+/**
+ * Unit tests of {@link Handler} class.
+ */
+public class HandlerTest {
+
+    /**
+     * Use the test rules to remove any layers and reset state.
+     */
+    @Rule
+    public final JOSMTestRules rules = new JOSMTestRules();
+
+    /**
+     * Setup test.
+     */
+    @Before
+    public void setUp() {
+        Handler.install();
+    }
+
+    /**
+     * Reads a base-64 image.
+     * @throws IOException if any I/O error occurs
+     */
+    @Test
+    public void testBase64Image() throws IOException {
+        // Red dot image, taken from https://en.wikipedia.org/wiki/Data_URI_scheme#HTML
+        URLConnection connection = new Handler().openConnection(new URL("data:image/png;base64," +
+                "iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4"+
+                "//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="));
+        connection.connect();
+        assertNotNull(connection.getInputStream());
+    }
+}