public void TestPost()
{
//Arrange
var patients = new List <Patient>();
var dbSet = patients.AsQueryable().BuildMockDbSet();
var context = new Mock <hNextDbContext>(new DbContextOptions <hNextDbContext>());
context.Setup(c => c.Set <Patient>()).Returns(dbSet.Object);
Poster <Patient> poster = new Poster <Patient>(context.Object);
var patient = new Patient();
//Act
var result = poster.Post(patient).Result;
//Assert
dbSet.Verify(d => d.Update(patient), Times.Once);
context.Verify(c => c.SaveChangesAsync(It.IsAny <CancellationToken>()), Times.Once);
Assert.AreEqual(patient, result);
}