Began test/lib.js for testing patterns

test/lib.js

@@ -0,0 +1,53 @@
+/**
+ * Common test abstractions
+ *
+ *  Copyright (C) 2014 Mike Gerwitz
+ *
+ *  This file is part of jsTonic.
+ *
+ *  jstonic is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+var expect = require( 'chai' ).expect;
+
+
+/**
+ * Asserts that a method on C can be overridden, and executes mock code as part
+ * of the override method
+ *
+ * The generated subclass is returned, allowing methods to be invoked to trigger
+ * the execution of the overridden method.
+ *
+ * @param {Class}  C      class to attempt override on
+ * @param {string} name   name of method to override
+ * @param {Function} mock mock function for override
+ *
+ * @return {Class} generated subtype
+ */
+exports.checkOverride = function( C, name, mock )
+{
+    var SubC;
+
+    expect( function()
+    {
+        var dfn = {};
+
+        dfn[ 'override ' + name ] = mock;
+        SubC = C.extend( dfn );
+    } ).to.not.throw( Error );
+
+    // allows performing actions to trigger function for mock
+    return SubC;
+};
+