public void ReturnCorrectTransaction_WhenGetById()
{
var expectedResult = new Transaction()
{
Id = 1,
Sum = -10,
Description = "McDonalds",
DateTime = "2018-04-28",
AccountToIncreaseName = "Cafe",
AccountToSubstractName = "Salary"
};
var actualResult = transactionsService.GetTransactionById(1);
actualResult.Should().BeEquivalentTo(expectedResult);
}