public void UpdateExistingUser()
{
// Arrange
int userCount = _dbMock.Users.Count();
var user = new UserModel
{
NickName = "nickName2",
FullName = "fullName222"
};
// Act
_RESTService.UpdateUser(user.NickName, user);
var dbUser = _dbMock.Users.FirstOrDefault(i => i.NickName == user.NickName);
// Assert
Assert.IsNotNull(dbUser);
Assert.AreEqual(user.FullName, dbUser.FullName);
Assert.AreEqual(userCount, _dbMock.Users.Count());
}