NodeUtils tests update

src/NodeUtils.ts

@@ -142,6 +142,6 @@ export class NodeUtils {
      * @returns {boolean}
      */
     private static validateNode (node: INode): boolean {
-        return !!node;
+        return !!node && node.hasOwnProperty('type');
     }
 }

src/interfaces/nodes/IIfStatementNode.ts

@@ -0,0 +1,8 @@
+import { IBlockStatementNode } from "./IBlockStatementNode";
+import { INode } from "./INode";
+
+export interface IIfStatementNode extends INode {
+    test: any,
+    consequent: IBlockStatementNode,
+    alternate: IBlockStatementNode
+}