public async Task SingleCompositePK() {
await db.ExecuteAsync("DELETE FROM composite_pk");
await db.InsertAsync(new composite_pk { id1 = 1, id2 = 1, value = "fizz" });
await db.InsertAsync(new composite_pk { id1 = 1, id2 = 2, value = "fizz" });
await db.InsertAsync(new composite_pk { id1 = 2, id2 = 2, value = "fizz" });
Assert.IsNotNull(await db.SingleAsync<composite_pk>(new { id1 = 1, id2 = 2 }));
}