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Marcel Nadzam
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Add settlement unit tests
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‎FairSplit.Tests/FairSplit.Tests.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net8.0-windows</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>
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<IsTestProject>true</IsTestProject>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="coverlet.collector" Version="6.0.0" />
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<PackageReference Include="FluentAssertions" Version="8.7.1" />
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
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<PackageReference Include="xunit" Version="2.5.3" />
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<PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\FairSplit.Domain\FairSplit.Domain.csproj" />
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<ProjectReference Include="..\FairSplit\FairSplit.csproj" />
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</ItemGroup>
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<ItemGroup>
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<Using Include="Xunit" />
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</ItemGroup>
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</Project>

‎FairSplit.Tests/SettlementTests.cs‎

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using FairSplit.Domain.Model;
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using FairSplit.Domain.Model.Enums;
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using FairSplit.Utils;
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using FluentAssertions;
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namespace FairSplit.Tests
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{
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public class SettlementTests
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{
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private static Transaction MakeTransaction(
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string name,
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decimal total,
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Member payer,
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IEnumerable<MemberPayment> recipients)
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{
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return new(Guid.NewGuid(), name, total, payer, DateTime.UtcNow, false, default, recipients.ToList());
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}
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private static Group MakeGroup(
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string name,
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IEnumerable<Member> members,
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IEnumerable<Transaction> transactions)
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{
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var g = new Group(name);
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foreach (var m in members) g.AddMember(m);
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foreach (var t in transactions) g.AddTransaction(t);
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return g;
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}
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[Fact]
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public void PaidForThemselves()
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{
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var personA = new Member("PersonA");
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var personB = new Member("PersonB");
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var t1 = MakeTransaction("t1", 50m, personA,
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[
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new(personA, 50m)
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]);
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var t2 = MakeTransaction("t2", 50m, personB,
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[
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new(personB, 50m)
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]);
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Group group = MakeGroup("TestGroup", [personA, personB], [t1, t2]);
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var pays = TransactionSettler.CalculateBestSettleOptions(group);
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pays.Should().BeEmpty();
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}
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[Fact]
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public void TwoPeople_OneOwer()
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{
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var personA = new Member("PersonA");
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var personB = new Member("PersonB");
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var transaction = MakeTransaction("t1", 100m, personA,
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[
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new(personA, 50m),
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new(personB, 50m)
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]);
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Group group = MakeGroup("TestGroup", [personA, personB], [transaction]);
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var pays = TransactionSettler.CalculateBestSettleOptions(group);
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pays.Should().HaveCount(1);
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var payment = pays.Single();
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payment.From.Should().Be(personB);
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payment.To.Should().Be(personA);
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payment.Amount.Should().Be(50m);
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}
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[Fact]
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public void PaidOffTransaction()
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{
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var personA = new Member("A");
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var personB = new Member("B");
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var paidOff = MakeTransaction("Done", 100m, personA,
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[
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new(personA, 50m),
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new(personB, 50m)
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]);
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paidOff.IsPaidOff = true;
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var group = MakeGroup("TestGroup", [personA, personB], [paidOff]);
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var pays = TransactionSettler.CalculateBestSettleOptions(group);
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pays.Should().BeEmpty();
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}
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[Fact]
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public void PerfectCycle_CancelsOut()
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{
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var personA = new Member("A");
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var personB = new Member("B");
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var personC = new Member("C");
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var t1 = MakeTransaction("B paid for A", 10m, personB,
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[
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new(personA, 10m),
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]);
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var t2 = MakeTransaction("C paid for B", 10m, personC,
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[
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new(personB, 10m),
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]);
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var t3 = MakeTransaction("A paid for C", 10m, personA,
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[
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new(personC, 10m),
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]);
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var group = MakeGroup("TestGroup", [personA, personB, personC], [t1, t2, t3]);
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var pays = TransactionSettler.CalculateBestSettleOptions(group);
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pays.Should().BeEmpty();
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}
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[Fact]
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public void FourPeople_TransitivePayment()
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{
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var a = new Member("A");
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var b = new Member("B");
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var c = new Member("C");
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var d = new Member("D");
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var t1 = MakeTransaction("B for A", 10m, b,
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[
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new MemberPayment(a, 10m),
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]);
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var t2 = MakeTransaction("C for B", 10m, c,
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[
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new MemberPayment(b, 10m),
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]);
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var t3 = MakeTransaction("D for C", 10m, d,
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[
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new MemberPayment(c, 10m),
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]);
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var group = MakeGroup("TestGroup", [a, b, c, d], [t1, t2, t3]);
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var pays = TransactionSettler.CalculateBestSettleOptions(group);
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pays.Should().HaveCount(1);
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var p = pays.Single();
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p.From.Should().Be(a);
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p.To.Should().Be(d);
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p.Amount.Should().Be(10m);
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}
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[Fact]
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public void ThreePeople_SharedPayment()
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{
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var personA = new Member("PersonA");
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var personB = new Member("PersonB");
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var personC = new Member("PersonC");
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var t1 = MakeTransaction("t1", 90m, personA, []);
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var group = MakeGroup("TestGroup", [personA, personB, personC], [t1]);
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var pays = TransactionSettler.CalculateBestSettleOptions(group);
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pays.Should().HaveCount(2);
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pays.Should().ContainEquivalentOf(new Payment(personB, personA, 30m));
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pays.Should().ContainEquivalentOf(new Payment(personC, personA, 30m));
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}
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}
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}

‎FairSplit.sln‎

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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FairSplit.Domain", "FairSplit.Domain\FairSplit.Domain.csproj", "{95997C82-5B05-44D6-A170-B62642EACF86}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FairSplit.Tests", "FairSplit.Tests\FairSplit.Tests.csproj", "{9383F9ED-A217-49F8-911C-D1D3D645BF6E}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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{95997C82-5B05-44D6-A170-B62642EACF86}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{95997C82-5B05-44D6-A170-B62642EACF86}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{95997C82-5B05-44D6-A170-B62642EACF86}.Release|Any CPU.Build.0 = Release|Any CPU
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{9383F9ED-A217-49F8-911C-D1D3D645BF6E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{9383F9ED-A217-49F8-911C-D1D3D645BF6E}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{9383F9ED-A217-49F8-911C-D1D3D645BF6E}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{9383F9ED-A217-49F8-911C-D1D3D645BF6E}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE

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