public async Task CreateAndReadBack(IEmployeeClassificationAsynchronousRepository <TModel> repository)
        {
            if (repository == null)
            {
                throw new ArgumentNullException("repository", "repository is null.");
            }

            var newRecord = new TModel();

            newRecord.EmployeeClassificationName = "Test " + DateTime.Now.Ticks;
            var newKey = await repository.CreateAsync(newRecord);

            Assert.True(newKey >= 1000); //keys under 1000 were not generated by the database

            var echo = await repository.GetByKeyAsync(newKey);

            Assert.Equal(newKey, echo.EmployeeClassificationKey);
            Assert.Equal(newRecord.EmployeeClassificationName, echo.EmployeeClassificationName);


            var search = await repository.FindByNameAsync(newRecord.EmployeeClassificationName);

            Assert.Equal(newKey, search.EmployeeClassificationKey);
            Assert.Equal(newRecord.EmployeeClassificationName, search.EmployeeClassificationName);
        }
        public async Task GetByKey(IEmployeeClassificationAsynchronousRepository <TModel> repository)
        {
            if (repository == null)
            {
                throw new ArgumentNullException("repository", "repository is null.");
            }


            var ec1 = await repository.GetByKeyAsync(1);

            var ec2 = await repository.GetByKeyAsync(2);

            var ec3 = await repository.GetByKeyAsync(3);

            Assert.Equal(1, ec1.EmployeeClassificationKey);
            Assert.Equal(2, ec2.EmployeeClassificationKey);
            Assert.Equal(3, ec3.EmployeeClassificationKey);
        }