public void QueryOneTest()
        {
            using (var modelContext = new TestModelContext()) {
                modelContext.Add <TestEntity> (new TestEntity {
                    Id = 1, Title = "Hello, world!"
                });
                modelContext.Add <TestEntity> (new TestEntity {
                    Id = 2, Title = "Hello again!"
                });

                Assert.Equal(2, modelContext.QueryWhere <TestEntity> (e => e.Id == 2).Single().Id);
            }
        }