public void AddRefreshTokenCheckWhenRefreshTokenNotExist_Test()
{
_refreshTokenRepositoryMock.Setup(repo => repo.GetAsync(It.IsAny <System.Linq.Expressions.Expression <Func <RefreshTokens, bool> > >())).Returns(async() => { return(null); });
_refreshTokenRepositoryMock.Setup(repo => repo.InsertAsync(refreshTokenInitialize)).Returns(async() => { return(refreshTokenInitialize); });
var result = _refreshTokenService.AddRefreshTokenAsync(RefreshToken, UserId, DaysToExpire);
Assert.IsTrue(result.IsCompleted);
}