@Test
public void testGetStoredETagDoesNotExist() {

    AmazonDynamoDB dynamoDB = PowerMock.createMock(AmazonDynamoDB.class);
    Map<String, AttributeValue> resourceKey = new HashMap<String, AttributeValue>();
    resourceKey.put(MarsDynamoDBManager.RESOURCE_TABLE_HASH_KEY, new AttributeValue(resource));
    // Get item
    dynamoDB.getItem(table, resourceKey);
    GetItemResult result = new GetItemResult();
    PowerMock.expectLastCall().andReturn(result);
    PowerMock.replayAll();
    String resultETag = DynamoDBWorkerUtils.getStoredETag(dynamoDB, table, resource);
    assertEquals(null, resultETag);
    PowerMock.verifyAll();
}