Index: trunk/test/unit/org/openstreetmap/josm/io/OsmApiExceptionTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/io/OsmApiExceptionTest.java	(revision 14810)
+++ trunk/test/unit/org/openstreetmap/josm/io/OsmApiExceptionTest.java	(revision 14810)
@@ -0,0 +1,33 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.io;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.openstreetmap.josm.testutils.JOSMTestRules;
+
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
+
+/**
+ * Unit tests of {@link OsmApiException} class.
+ */
+public class OsmApiExceptionTest {
+
+    /**
+     * Setup tests
+     */
+    @Rule
+    @SuppressFBWarnings(value = "URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD")
+    public JOSMTestRules test = new JOSMTestRules().preferences();
+
+    /**
+     * Non-regression test for <a href="https://josm.openstreetmap.de/ticket/17328">Bug #17328</a>.
+     */
+    @Test
+    public void testTicket17328() {
+        assertFalse(new OsmApiException(503, "foo", "bar").isHtml());
+        assertTrue(new OsmApiException(503, null, "<h2>This website is under heavy load (queue full)</h2><p>Sorry...</p>").isHtml());
+    }
+}