mostalive
49f4ca395f
The fake DbContext now stores data-only DbBase subclasses (renamed from the identity-only Shadow wrappers) and refreshes rows in place on re-Save; the object graph is flattened to ids in storage. yak: data-carrying-persistence-records-orderdataclientdata-mappers-tb3a
89 lines
2.8 KiB
C#
89 lines
2.8 KiB
C#
using After;
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namespace BeforeAfter.Tests;
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/// <summary>
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/// The after <see cref="DbContext"/> stores data-only persistence records
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/// (<see cref="ClientData"/> / <see cref="OrderData"/>), never domain objects:
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/// <see cref="DbContext"/>'s <c>Save</c> maps domain state into a row —
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/// inserting on the first save, refreshing in place on later ones — and the
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/// stored graph is flattened to ids.
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/// </summary>
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public class AfterPersistenceTests
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{
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[Fact]
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public void Save_maps_domain_state_into_data_records()
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{
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var db = new DbContext();
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var client = new Client { Name = "Acme" };
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var order = new Order { Description = "one" };
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client.Orders.Add(order);
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db.Save(client);
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db.Save(order);
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var clientRow = Assert.Single(db.Clients);
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Assert.Equal(client.Id, clientRow.Id);
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Assert.Equal("Acme", clientRow.Name);
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var orderRow = Assert.Single(db.Orders);
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Assert.Equal(order.Id, orderRow.Id);
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Assert.Equal("one", orderRow.Description);
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Assert.Equal(client.Id, orderRow.ClientId); // the graph is flattened to a key
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}
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[Fact]
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public void An_order_without_client_stores_an_empty_client_id()
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{
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var db = new DbContext();
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var order = new Order { Description = "orphan" };
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db.Save(order);
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Assert.Equal(Guid.Empty, Assert.Single(db.Orders).ClientId);
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}
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[Fact]
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public void Saving_again_refreshes_the_row_instead_of_duplicating_it()
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{
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var db = new DbContext();
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var client = new Client { Name = "Acme" };
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var order = new Order { Description = "one" };
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client.Orders.Add(order);
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db.Save(client);
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db.Save(order);
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order.Description = "one (edited)";
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client.Name = "Acme GmbH";
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db.Save(order);
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db.Save(client);
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// One row per saved object, refreshed with the *current* state:
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var orderRow = Assert.Single(db.Orders);
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Assert.Equal(order.Id, orderRow.Id);
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Assert.Equal("one (edited)", orderRow.Description);
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Assert.Equal(client.Id, orderRow.ClientId);
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var clientRow = Assert.Single(db.Clients);
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Assert.Equal("Acme GmbH", clientRow.Name);
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}
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[Fact]
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public void Rows_are_reachable_through_Set_and_Find()
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{
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var db = new DbContext();
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var client = new Client { Name = "Acme" };
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var order = new Order { Description = "one" };
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client.Orders.Add(order);
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db.Save(client);
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db.Save(order);
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Assert.Single(db.Set<ClientData>());
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Assert.Single(db.Set<OrderData>());
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var found = db.Find<OrderData>(row => row.Description == "one");
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Assert.Equal(order.Id, found!.Id);
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Assert.Null(db.Find<OrderData>(row => row.Description == "no such order"));
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}
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}
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