public async Task GetComparison_ExistingEntry_ShouldCompare()
{
_diffService.GetDiffResult(TestConstants.DiffId).Returns(new DiffResult {
Type = DiffResultType.SizeMismatch
});
IActionResult result = await _controller.GetComparisonResultAsync(TestConstants.DiffId);
await _diffService.Received().GetDiffResult(TestConstants.DiffId);
Assert.IsType <OkObjectResult>(result);
}