Fin du live coding

Domain/CreditComputer.cs

+namespace Domain;
+
+public class CreditComputer
+{
+    public static decimal ComputeMonthlyPayment(int duration, decimal amount, decimal rate)
+    {
+        decimal monthlyRate = rate / 100 / 12;
+        decimal numerator = amount * monthlyRate;
+        double denominator = 1 - Math.Pow((double)(1 + monthlyRate), -(double)duration);
+
+        return Math.Round(numerator / (decimal)denominator, 2, MidpointRounding.ToZero);
+    }
+}
\ No newline at end of file

Domain/CreditDurationInMonth.cs

+using static System.Runtime.InteropServices.JavaScript.JSType;
+
+namespace Domain;
+
+public record CreditDurationInMonth
+{
+    public CreditDurationInMonth(int value)
+    {
+        if (value < 108 || value > 300) throw new ArgumentOutOfRangeException("value");
+
+        this.value = value;
+    }
+    public CreditDurationInMonth(string input)
+    {
+        try
+        {
+            value = Convert.ToInt32(input);
+            if (value < 0)
+                throw new Exception();
+        } catch
+        {
+            throw new ArgumentException("input must be strictly positive integer");
+        }
+    }
+    public int value { get; init; }
+}
\ No newline at end of file

LiveCodingTP3/LiveCodingTP3.csproj → Domain/Domain.csproj

 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

Domain/IClock.cs

+namespace Domain;
+
+public interface IClock
+{
+    public DateTime Now { get; }
+}
\ No newline at end of file

Domain/IFileSystem.cs

+namespace Domain;
+
+public interface IFileSystem
+{
+    public void SaveResult(decimal monthlyPayment, string fileName);
+
+    public decimal GetInfoFromFile(string fileName);
+}
\ No newline at end of file

Domain/ScheduleGenerator.cs

+namespace Domain;
+
+public class ScheduleGenerator
+{
+    private IFileSystem _fileSystemFake { get; }
+    private IClock _clock { get; }
+    public ScheduleGenerator(IFileSystem fileSystemFake, IClock clock)
+    {
+        _fileSystemFake = fileSystemFake;
+        _clock = clock;
+    }
+
+    public string generateSchedule(CreditDurationInMonth durationInMonth, decimal amount, decimal rate)
+    {
+        _fileSystemFake.SaveResult(CreditComputer.ComputeMonthlyPayment(durationInMonth.value, amount, rate), _clock.Now.ToShortDateString());
+
+        return _clock.Now.ToShortDateString();
+    }
+}
\ No newline at end of file

LiveCodingTP3.Tests/CreditComputerTests.cs

+namespace LiveCodingTP3.Tests;
+
+using Domain;
+
+using LiveCodingTP3.Console;
+
+public class CreditComputerTest
+{
+
+    [Theory]
+    [InlineData(120, 100000, 2d, 920.13)]
+    [InlineData(120, 100000, 4d, 1012.45)]
+    [InlineData(240, 200000, 3d, 1109.19)]
+    public void MonthlyamountShouldBeOk(int duration, decimal amount, decimal rate, decimal expectedMonthlyPayment)
+    {
+        decimal monthlyAmount = CreditComputer.ComputeMonthlyPayment(duration, amount, rate);
+
+        Assert.Equal(expectedMonthlyPayment, monthlyAmount);
+    }
+
+}
\ No newline at end of file

LiveCodingTP3.Tests/Fixtures/FakeClock.cs

+using Domain;
+
+namespace LiveCodingTP3.Tests.Fixtures;
+
+public class FakeClock : IClock
+{
+    private readonly DateTime fakeDateTime;
+    public FakeClock(DateTime fakeDateTime)
+    {
+        this.fakeDateTime = fakeDateTime;
+    }
+
+    public DateTime Now => fakeDateTime;
+}
\ No newline at end of file

LiveCodingTP3.Tests/Fixtures/FileSystemFake.cs

+using Domain;
+
+namespace LiveCodingTP3.Tests.Fixtures;
+
+public class FileSystemFake : IFileSystem
+{
+    public Dictionary<string, decimal> keyValuePairs { get; private set; } = new();
+
+    public decimal GetInfoFromFile(string fileName)
+    {
+        return keyValuePairs[fileName];
+    }
+
+    public void SaveResult(decimal monthlyPayment, string fileName)
+    {
+        keyValuePairs[fileName] = monthlyPayment;
+    }
+}
\ No newline at end of file

LiveCodingTP3.Tests/LiveCodingTP3.Tests.csproj

-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
@@ -10,9 +10,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.7">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
@@ -23,7 +23,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\LiveCodingTP3\LiveCodingTP3.csproj" />
+    <ProjectReference Include="..\LiveCodingTP3\LiveCodingTP3.Console.csproj" />
   </ItemGroup>
 
 </Project>

LiveCodingTP3.Tests/ScheduleGeneratorTest.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using Domain;
+
+using LiveCodingTP3.Console;
+using LiveCodingTP3.Tests.Fixtures;
+
+namespace LiveCodingTP3.Tests;
+public class ScheduleGeneratorTest
+{
+    [Theory]
+    [InlineData(120, 100000, 2d, 920.13)]
+    [InlineData(120, 100000, 4d, 1012.45)]
+    [InlineData(240, 200000, 3d, 1109.19)]
+    public void ShouldPersistMonthlyPaymentProperly(int duration, decimal amount, decimal rate, decimal expectedMonthlyPayment)
+    {
+        // Arrange
+        var fakeFileSystem = new FileSystemFake(); 
+        var sut = new ScheduleGenerator(fakeFileSystem, new FakeClock(DateTime.Now));
+
+        // Act 
+        var fileName = sut.generateSchedule(new CreditDurationInMonth(duration), amount, rate);
+
+        // Assert
+        Assert.Equal(expectedMonthlyPayment, fakeFileSystem.GetInfoFromFile(fileName));
+    }
+
+}

LiveCodingTP3.Tests/UserInputsTests.cs

 namespace LiveCodingTP3.Tests;
 
+using LiveCodingTP3.Console;
+
 public class UserInputsTests
 {
-    [Fact]
-    public void UserInput_ValidArgs_ArgsSet()
+    [Theory]
+    [InlineData("108","100000", "4,1", 108, 100000, 4.1d)]
+    [InlineData("300","200000", "1,5", 300,200000, 1.5d)]
+    public void UserInput_ValidArgs_ArgsSet(string durationInMonths, string amount, string nomimalRate,
+        int expectedDuration, int expectedAmount, decimal expectedRate)
     {
-        string durationInMonths = "108";
-        string amount = "100000";
-        string nomimalRate = "4,1"; 
         string[] args = { durationInMonths, amount, nomimalRate };
 
         var inputs = new UserInputs(args);
 
-        Assert.Equal(108, inputs.durationInMonths);
-        Assert.Equal(100000, inputs.amount);
-        Assert.Equal(4.1M, inputs.nomimalRate);
+        Assert.Equal(expectedDuration, inputs.durationInMonths.value);
+        Assert.Equal(expectedAmount, inputs.amount);
+        Assert.Equal(expectedRate, inputs.nomimalRate);
+    }
+
+    [Fact]
+    public void UserInput_InvalidArgs_ThrowsException()
+    {
+        string durationInMonths = "-108";
+        string amount = "100000";
+        string nomimalRate = "4,1";
+        string[] args = { durationInMonths, amount, nomimalRate };
+
+        Assert.Throws<ArgumentException>(() => new UserInputs(args));
     }
 }
\ No newline at end of file

LiveCodingTP3.sln

@@ -3,10 +3,12 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.8.34511.84
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LiveCodingTP3", "LiveCodingTP3\LiveCodingTP3.csproj", "{91C89BAE-5D26-4DF2-B30D-330408557A2D}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LiveCodingTP3.Console", "LiveCodingTP3\LiveCodingTP3.Console.csproj", "{91C89BAE-5D26-4DF2-B30D-330408557A2D}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LiveCodingTP3.Tests", "LiveCodingTP3.Tests\LiveCodingTP3.Tests.csproj", "{48159523-69C6-45D3-BD19-69C186D4897A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Domain", "Domain\Domain.csproj", "{EBB06A78-5FDD-4E85-A3B3-209BD16C17D3}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -21,6 +23,10 @@ Global
 		{48159523-69C6-45D3-BD19-69C186D4897A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{48159523-69C6-45D3-BD19-69C186D4897A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{48159523-69C6-45D3-BD19-69C186D4897A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{EBB06A78-5FDD-4E85-A3B3-209BD16C17D3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EBB06A78-5FDD-4E85-A3B3-209BD16C17D3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EBB06A78-5FDD-4E85-A3B3-209BD16C17D3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EBB06A78-5FDD-4E85-A3B3-209BD16C17D3}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

LiveCodingTP3.v3.ncrunchsolution

+<SolutionConfiguration>
+  <Settings>
+    <AllowParallelTestExecution>True</AllowParallelTestExecution>
+    <SolutionConfigured>True</SolutionConfigured>
+  </Settings>
+</SolutionConfiguration>
\ No newline at end of file

LiveCodingTP3/LiveCodingTP3.Console.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Domain\Domain.csproj" />
+  </ItemGroup>
+
+</Project>

LiveCodingTP3/Program.cs

-namespace LiveCodingTP3;
+
+using LiveCodingTP3.Console;
 
-internal class Program
+public class Program
 {
     static void Main(string[] args)
     {
-        Console.WriteLine("Hello, World!");
+        var inputs = new UserInputs(args);
+
+        Console.WriteLine($"Duration : {inputs.durationInMonths.value}");
+        Console.WriteLine($"Amount : {inputs.amount}");
+        Console.WriteLine($"Rate : {inputs.nomimalRate}");
+
+
     }
 }

LiveCodingTP3.Tests/UserInputs.cs → LiveCodingTP3/UserInputs.cs

-namespace LiveCodingTP3.Tests;
+using Domain;
 
-internal class UserInputs
+namespace LiveCodingTP3.Console;
+
+public class UserInputs
 {
-    public readonly int durationInMonths;
+    public readonly CreditDurationInMonth durationInMonths;
     public readonly decimal amount;
     public readonly decimal nomimalRate;
 
-    public UserInputs(string[] args): this(args[0], args[1], args[2])
+    public UserInputs(string[] args) : this(args[0], args[1], args[2])
     { }
 
     public UserInputs(string durationInMonths, string amount, string nomimalRate)
     {
-        this.durationInMonths = Convert.ToInt32(durationInMonths);
+        this.durationInMonths = new CreditDurationInMonth(durationInMonths);
         this.amount = Convert.ToDecimal(amount);
         this.nomimalRate = Convert.ToDecimal(nomimalRate);
     }