Added JUnit tests for XMLTokenerTest

src/test/java/org/json/junit/XMLTokenerTest.java

@@ -0,0 +1,81 @@
+package org.json.junit;
+
+import org.json.XMLTokener;
+import org.junit.Test;
+
+import java.io.StringReader;
+
+import static org.junit.Assert.*;
+
+/**
+ * Tests for JSON-Java XMLTokener.java
+ */
+public class XMLTokenerTest {
+
+    /**
+     * Tests that nextCDATA() correctly extracts content from within a CDATA section.
+     */
+    @Test
+    public void testNextCDATA() {
+        String xml = "This is <![CDATA[ some <CDATA> content ]]> after";
+        XMLTokener tokener = new XMLTokener(new StringReader(xml));
+        tokener.skipPast("<![CDATA[");
+        String cdata = tokener.nextCDATA();
+        assertEquals(" some <CDATA> content ", cdata);
+    }
+
+    /**
+     * Tests that nextContent() returns plain text content before a tag.
+     */
+    @Test
+    public void testNextContentWithText() {
+        String xml = "Some content<nextTag>";
+        XMLTokener tokener = new XMLTokener(xml);
+        Object content = tokener.nextContent();
+        assertEquals("Some content", content);
+    }
+
+    /**
+     * Tests that nextContent() returns '<' character when starting with a tag.
+     */
+    @Test
+    public void testNextContentWithTag() {
+        String xml = "<tag>";
+        XMLTokener tokener = new XMLTokener(xml);
+        Object content = tokener.nextContent();
+        assertEquals('<', content);
+    }
+
+    /**
+     * Tests that nextEntity() resolves a known entity like &amp; correctly.
+     */
+    @Test
+    public void testNextEntityKnown() {
+        XMLTokener tokener = new XMLTokener("amp;");
+        Object result = tokener.nextEntity('&');
+        assertEquals("&", result);
+    }
+
+    /**
+     * Tests that nextEntity() preserves unknown entities by returning them unchanged.
+     */
+    @Test
+    public void testNextEntityUnknown() {
+        XMLTokener tokener = new XMLTokener("unknown;");
+        tokener.next(); // skip 'u'
+        Object result = tokener.nextEntity('&');
+        assertEquals("&nknown;", result);  // malformed start to simulate unknown
+    }
+
+    /**
+     * Tests skipPast() to ensure the cursor moves past the specified string.
+     */
+    @Test
+    public void testSkipPast() {
+        String xml = "Ignore this... endHere more text";
+        XMLTokener tokener = new XMLTokener(xml);
+        tokener.skipPast("endHere");
+        assertEquals(' ', tokener.next()); // should be the space after "endHere"
+    }
+
+}