mostalive
46b91fc3ce
OrderLine + computed TotalInCents; both inbound mappers reconstruct a one-line order from the flat DTO/row (derived data is re-derived, not written); builder realises WithTotal as a single line. Outbound mappers, DTO, OrderData, DbContext and WebApp untouched — the small-steps payoff. yak: exercise-2-solution-on-branch-exercise-2-solution-hw7e
52 lines
1.8 KiB
C#
52 lines
1.8 KiB
C#
using After;
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using static BeforeAfter.Tests.TestData.ClientBuilder;
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using static BeforeAfter.Tests.TestData.OrderBuilder;
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namespace BeforeAfter.Tests;
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/// <summary>
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/// EXERCISE 2 — the domain gained OrderLines; persistence still stores one
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/// flat row per order. (This is the solution participants arrive at from the
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/// stub in EXERCISE2.md.)
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/// </summary>
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public class OrderLinesEvolutionTests
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{
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[Fact] // EXERCISE STEP 3a
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public void A_reloaded_order_can_be_discounted()
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{
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var db = new DbContext();
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var order = ValidOrder().WithDescription("big order").WithTotal(150_00).Build();
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var client = ValidClient().WithName("Acme").WithOrder(order).Build();
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db.Save(client);
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db.Save(order);
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var loaded = db.LoadOrder(order.Id)!;
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// The discount works off the computed total of the RELOADED order:
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var discounted = DiscountCalculator.CalculateDiscount(
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loaded, discountBarrierCents: 100_00, discountPercentage: 10);
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Assert.Equal(135_00, discounted.DiscountedTotalInCents);
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Assert.Equal(10, discounted.DiscountPercentage);
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}
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[Fact] // EXERCISE STEP 3b — the accepted loss
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public void A_multi_line_order_flattens_to_a_single_line_when_stored()
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{
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var db = new DbContext();
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var order = ValidOrder().WithDescription("mixed order").Build();
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order.Lines.Add(new OrderLine("first item", 100_00));
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order.Lines.Add(new OrderLine("second item", 50_00));
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db.Save(order);
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var loaded = db.LoadOrder(order.Id)!;
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// Storage flattened the order: one line, the flat total, and the
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// order-level description. Documented, not hidden.
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var line = Assert.Single(loaded.Lines);
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Assert.Equal(150_00, line.AmountInCents);
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Assert.Equal("mixed order", line.Description);
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}
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}
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