public async Task BlockCollectionCreation_ReturnsConflictResponse_GivenExistingId()
{
//Arrange
Guid id = new Guid("03a6907d-4e93-4863-bdaf-1d05140dec12");
_mockCollectionService.Setup(c => c.CollectionExists(It.IsAny <Guid>())).ReturnsAsync(true);
//Act
var response = await _controller.BlockCollectionCreation(id) as StatusCodeResult;
//Assert
Assert.Equal(StatusCodes.Status409Conflict, response.StatusCode);
_mockCollectionService.Verify(c => c.CollectionExists(id));
}