add failing unit tests from wiki and try-ctop page

tests/error-tests.js

@@ -1,9 +1,45 @@
-CToP.transform(document.querySelectorAll('math'));
+function formatXml(xml) {
+    var formatted = '';
+    var reg = /(>)(<)(\/*)/g;
+    xml = xml.replace(reg, '$1\r\n$2$3');
+    var pad = 0;
+    xml.split('\r\n').map(function(node,index) {
+        var indent = 0;
+        if (node.match( /.+<\/\w[^>]*>$/ )) {
+            indent = 0;
+        } else if (node.match( /^<\/\w/ )) {
+            if (pad != 0) {
+                pad -= 1;
+            }
+        } else if (node.match( /^<\w[^>]*[^\/]>.*$/ )) {
+            indent = 1;
+        } else {
+            indent = 0;
+        }
+
+        var padding = '';
+        for (var i = 0; i < pad; i++) {
+            padding += '  ';
+        }
+
+        formatted += padding + node + '\r\n';
+        pad += indent;
+    });
+
+    return formatted;
+}
+
 Array.prototype.map.call(document.querySelectorAll('.unit'),function(unit) {
-	var math = unit.querySelector('math').outerHTML;
-	var t = document.createElement('pre');
-	t.textContent = math;
-	unit.appendChild(t);
+	try {
+		var mathNodes = unit.querySelectorAll('math');
+		CToP.transform(mathNodes);
+		var math = unit.querySelector('math').outerHTML;
+		var t = document.createElement('pre');
+		t.textContent = formatXml(math);
+		unit.appendChild(t);
+		MathJax.Hub.Queue(["Typeset",MathJax.Hub,unit]);
+	}
+	catch(e) {
+		console.log(e);
+	}
 })
-
-MathJax.Hub.Queue(["Typeset",MathJax.Hub]);