Adds delete sendername test

Author: maciejlew

src/test/java/pl/smsapi/api/action/sms/sendernames/SendernamesFactoryTest.java

@@ -66,6 +66,22 @@ public void deleteSendername() throws SmsapiException {
         assertNotNull(responseDelete);
     }
 
+    @Test
+    public void deleteSendernameWithError() throws SmsapiException {
+        SendernameDelete actionDelete = apiFactory.actionDelete(SenderMother.createRandomValid());
+        boolean errorCatch = false;
+
+        try {
+            actionDelete.execute();
+        } catch (SmsapiErrorException badRequest) {
+            assertEquals("Not found sender", badRequest.getMessage());
+            assertEquals("not_found", badRequest.getError());
+            errorCatch = true;
+        }
+
+        assertTrue(errorCatch);
+    }
+
     @Test
     public void makeDefaultSendername() throws SmsapiException {
         SendernameAdd actionAdd = apiFactory.actionAdd(SenderMother.createRandomValid());