added complete tests

tests/TestJSONException.java

@@ -0,0 +1,35 @@
+/*
+ * File: TestJSONException.java Author: JSON.org
+ */
+package org.json.tests;
+
+import org.json.JSONException;
+
+import junit.framework.TestCase;
+
+/**
+ * The Class TestJSONException.
+ */
+public class TestJSONException extends TestCase {
+
+	/** The jsonexception. */
+	JSONException jsonexception;
+    
+	/**
+	 * Tests the constructor method using string.
+	 */
+	public void testConstructor_String() {
+	    jsonexception = new JSONException("test String");
+        assertEquals("test String", jsonexception.getMessage());
+	}
+	
+    /**
+     * Tests the constructor method using exception.
+     */
+    public void testConstructor_Exception() {
+        Exception e = new Exception();
+        jsonexception = new JSONException(e);
+        assertEquals(e, jsonexception.getCause());
+    }
+    
+}