Utility to pretty print XML

Change-Id: I8241e2643d64f9a2104751c6afd164c1b716f145
diff --git a/utils/misc/src/test/java/org/onlab/util/XmlStringTest.java b/utils/misc/src/test/java/org/onlab/util/XmlStringTest.java
new file mode 100644
index 0000000..b09c44d
--- /dev/null
+++ b/utils/misc/src/test/java/org/onlab/util/XmlStringTest.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onlab.util;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class XmlStringTest {
+
+    @Test
+    public void testToString() {
+        String input = "<root>   <a some='foo '/><b attr='4' ><c>42</c></b></root>";
+        CharSequence xml = XmlString.prettifyXml(input);
+        String expected = "<root>\n"
+                        + "  <a some=\"foo \"/>\n"
+                        + "  <b attr=\"4\">\n"
+                        + "    <c>42</c>\n"
+                        + "  </b>\n"
+                        + "</root>\n";
+        assertEquals(expected, xml.toString());
+    }
+
+    @Test
+    public void illFormed() {
+        String input = "<root>   <a some='foo '/>";
+
+        assertEquals(input, XmlString.prettifyXml(input).toString());
+    }
+
+}