Add `.pass()` method for generating passing assertions

lib/test.js

@@ -308,6 +308,20 @@ Test.prototype.error = function (err, msg) {
 	});
 };
 
+/**
+ * Generate a passing assertion
+ *
+ * @param {String} msg
+ * @api public
+ */
+
+Test.prototype.pass = function (msg) {
+	this._assert(true, {
+		message: msg,
+		operator: 'pass'
+	});
+};
+
 /**
  * Generate a failing assertion
  *