Add tests for XmlHelper

common/src/test/java/com/microsoft/alm/helpers/XmlHelperTest.java

@@ -3,15 +3,47 @@
 
 package com.microsoft.alm.helpers;
 
-import org.junit.Before;
+import org.junit.Assert;
+import org.junit.Test;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import java.io.ByteArrayInputStream;
 
 public class XmlHelperTest {
 
-    XmlHelper underTest;
+    @Test
+    public void getText_typical() throws Exception {
+        final String inputXmlString =
+            "<?xml version='1.0' encoding='UTF-8' standalone='no'?>\n" +
+            "<value>I am a jelly donut.</value>";
+        final byte[] inputXmlBytes = StringHelper.UTF8GetBytes(inputXmlString);
+        final ByteArrayInputStream bais = new ByteArrayInputStream(inputXmlBytes);
+        final DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
+        final DocumentBuilder builder = dbf.newDocumentBuilder();
+        final Document document = builder.parse(bais);
+        final Element rootNode = document.getDocumentElement();
 
-    @Before
-    public void setUp() {
-        underTest = new XmlHelper();
+        final String actual = XmlHelper.getText(rootNode);
+
+        Assert.assertEquals("I am a jelly donut.", actual);
     }
 
+    @Test
+    public void toString_typical() throws Exception {
+        final String inputXmlString =
+            "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n" +
+            "<value>I am a jelly donut.</value>\n";
+        final byte[] inputXmlBytes = StringHelper.UTF8GetBytes(inputXmlString);
+        final ByteArrayInputStream bais = new ByteArrayInputStream(inputXmlBytes);
+        final DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
+        final DocumentBuilder builder = dbf.newDocumentBuilder();
+        final Document document = builder.parse(bais);
+
+        final String actual = XmlHelper.toString(document);
+
+        StringHelperTest.assertLinesEqual(inputXmlString, actual);
+    }
 }