Run an org's namespace tests from the developer console. Just open the browser's Javascript console and past the code in. Update: Will now use an unsupported servlet instead of the Tooling API to prevent compilation if the SymbolTables are not in the cache. To use the Tooling API, change line 115/116.

RunNSTests.js

function runNamespacedTest(namespace) {
	var thisOrgsNs = SfdcDevConsole.hasNamespace() ? SfdcDevConsole.namespace : '';
	var ns = namespace || thisOrgsNs;

	function log(msg) {
		if (console && console.log) console.log(msg);
	}

	function showErrorMessage() {
		Ext.Msg.alert('Running namespaced tests failed', 'Please look at the javascript console for more information.');
	}

	function enqueueTest(ids) {
		if (ids.length === 0) {
			Ext.Msg.alert('No tests enqueued', 'No test found in namespace "'+ns+'"');
			return;
		}

		log('Enqueuing ' + ids.length + ' tests');
		Ext.Msg.updateProgress(.6, 'Enqueuing ' + ids.length + ' tests');
		if (SfdcDevConsole.ToolingAPI.runTests) {
			SfdcDevConsole.ToolingAPI.runTests({classids: ids}, {
	        	continuation: function() {
	        		Ext.Msg.close();
	        	},
	        	failure : showErrorMessage

	        });
		} else {
			//Support for API v29. runTests was added in v30.
			Ext.Ajax.request({
				url : '/_ui/common/apex/test/ApexTestQueueServlet', 
				params : {
					action:'ENQUEUE',
					classid:ids
				},
				success : function() {
	        		Ext.Msg.close();
	        	}
			});
		}
	}

	function getTestIdsFromApexClasses(classes) {
		var ids = [];

		for (var i = 0; i < classes.length; i++) {
			var rec = classes[i];
			var st = rec.SymbolTable;
			var mods = st.tableDeclaration.modifiers;
			var modLen = mods.length;
			while (modLen--) {
				if (mods[modLen] === 'TEST') {
					log('Found test: '+st.name);
					ids.push(rec.Id);
				}
			}
		}

		return ids;
	}

	function enqueueTestClassesRetreivedFromToolingAPI() {
		SfdcDevConsole.ToolingAPI.query("SELECT Id, SymbolTable FROM ApexClass WHERE NamespacePrefix = '"+ns+"'", {
			continuation : function(r) {
				Ext.Msg.updateProgress(.3, 'Finding tests classes via symbol tables');
				try {
					enqueueTest(getTestIdsFromApexClasses(r.records));
				} catch(e) {
					showErrorMessage();
					if (console && console.error) console.error(e);
					throw e;
				}
			},
			failure : showErrorMessage
		});
	}

	function enqueueTestClassesRetreivedFromInternalServlet() {
		Ext.Ajax.request({
			url : '/_ui/common/apex/test/ApexTestQueueServlet', 
		    params : {
		        action:'GET_TESTS'
		    },
		    success : function(response) {
				Ext.Msg.updateProgress(.3, 'Finding tests classes via internal servlet');

				try {
					var res = Util.evalAjaxServletOutput(response.responseText);
			        console.log(res);
			        var classes = res.testClasses;
			        var ids = [];

			        //The internal servlet returns "My Namespace" when in the orgs namespace... weird.
			        var nsName = thisOrgsNs === ns ? 'My Namespace' : ns;
			        for (var i = 0; i < classes.length; i++) {
			            var c = classes[i];
			            if (c.ns.indexOf(nsName) >= 0) {
			                ids.push(c.id);
			                log('Found test: '+c.name);
			            }
			        }
			        enqueueTest(ids);
				} catch(e) {
					showErrorMessage();
					if (console && console.error) console.error(e);
					throw e;
				}
		    }
		});
	}

	Ext.Msg.progress('Running namespaced tests', 'Fetching apex classes');

	//enqueueTestClassesRetreivedFromToolingAPI();
	enqueueTestClassesRetreivedFromInternalServlet();
	
}

//Run the org's namespaced tests, or enter a namespace.
runNamespacedTest();