public void Specification_filters_out_non_matching_objects_from_ienumerable()
        {
            var testObjects = new List<TestClass>();
            testObjects.Add(new TestClass() { Salary = 3000 });
            testObjects.Add(new TestClass() { Salary = 5000 });
            testObjects.Add(new TestClass() { Salary = 6000 });

            var specification = new GenericSpecification<TestClass>(t => t.Salary > 4000);

            var filteredQuery = specification.Filter(testObjects);

            AsserThatAllTestObjectHasSalaryGreaterThan(filteredQuery, 4000);
        }