Generic/IncrementDecrementSpacing: improve test coverage

Adds tests using pre/post-incrementors with an object
property accessed through a method call.

Author: rodrigoprimo

src/Standards/Generic/Tests/WhiteSpace/IncrementDecrementSpacingUnitTest.inc

@@ -38,3 +38,6 @@ $obj->prop['key'] ++;
 
 getObject()->count
 ++;
+getObject()->count++;
+++ getObject()->count;
+++getObject()->count;

src/Standards/Generic/Tests/WhiteSpace/IncrementDecrementSpacingUnitTest.inc.fixed

@@ -36,3 +36,6 @@ $obj->prop['key']++;
 --ClassName::$prop;
 
 getObject()->count++;
+getObject()->count++;
+++getObject()->count;
+++getObject()->count;

src/Standards/Generic/Tests/WhiteSpace/IncrementDecrementSpacingUnitTest.php

@@ -54,6 +54,7 @@ public function getErrorList($testFile='')
             $errors[34] = 1;
             $errors[37] = 1;
             $errors[40] = 1;
+            $errors[42] = 1;
 
             return $errors;