Printing cause of exception when present

Author: Matheus Degiovani

PHPUnit/TextUI/ResultPrinter.php

@@ -274,6 +274,20 @@ protected function printDefectTrace(PHPUnit_Framework_TestFailure $defect)
             $defect->thrownException()
           )
         );
+        
+        $e = $defect->thrownException();
+        if (method_exists($e, 'getPrevious')) {
+            //php >= 5.3, exceptions may have a previous cause
+            $e = $e->getPrevious();
+            while ($e) {
+                $this->write(
+                    "\nCaused by\n" .
+                    PHPUnit_Util_Filter::getFilteredStacktrace($e)
+                );
+                $e = $e->getPrevious();
+            }
+        }
+        
     }
 
     /**