diff --git a/test/src/Exception/IDPExceptionTest.php b/test/src/Exception/IDPExceptionTest.php
index 3debc62..2dc6f8c 100644
--- a/test/src/Exception/IDPExceptionTest.php
+++ b/test/src/Exception/IDPExceptionTest.php
@@ -41,4 +41,32 @@ class IDPExceptionTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals('message: 404: message', (string)$exception);
     }
-}
\ No newline at end of file
+    
+    public function testEmptyMessage()
+    {
+        $exception = new IDPException(array('error' => 'error_message', 'message' => ''));
+        // message should be the error text since message isn't specifically defined
+        $this->assertEquals('error_message', $exception->getMessage());
+    }
+    
+    public function testNonEmptyMessage()
+    {
+        $exception = new IDPException(array('error' => 'error_message', 'message' => 'message'));
+        // message should be the error text since message isn't specifically defined
+        $this->assertEquals('message', $exception->getMessage());
+    }
+    
+    public function testEmptyError()
+    {
+        $exception = new IDPException(array('error' => '', 'message' => 'message'));
+        // message should be the error text since message isn't specifically defined
+        $this->assertEquals('message', $exception->getMessage());
+    }
+    
+    public function testEmptyAndMessage()
+    {
+        $exception = new IDPException(array('error' => '', 'message' => ''));
+        // message should be the error text since message isn't specifically defined
+        $this->assertEquals('Unknown Error.', $exception->getMessage());
+    }
+}