feat: add validations for contracts

Author: kamilbaczek

Chapter-3-microservice-extraction/Contracts/Src/Fitnet.Contracts.Api.UnitTests/Fitnet.Contracts.Api.UnitTests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <ItemGroup>
+    <PackageReference Include="Bogus" Version="34.0.2" />
+    <PackageReference Include="FluentAssertions" Version="6.10.0" />
+    <PackageReference Include="xunit" Version="2.4.2" />
+    <PackageReference Include="xunit.analyzers" Version="1.1.0" />
+    <PackageReference Include="xunit.categories" Version="2.0.6" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
+    <PackageReference Include="coverlet.collector" Version="3.2.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <InternalsVisibleTo Include="EvolutionaryArchitecture.Fitnet.Contracts.Api.UnitTests" />
+  </ItemGroup>
+</Project>

Chapter-3-microservice-extraction/Contracts/Src/Fitnet.Contracts.Api.UnitTests/RequestValidator/InvalidPrepareContractRequestTestCases.cs

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+namespace EvolutionaryArchitecture.Fitnet.Contracts.Api.UnitTests.RequestValidator;
+
+using System.Collections;
+using Bogus;
+
+internal sealed class InvalidPrepareContractRequestTestCases : IEnumerable<object[]>
+{
+    private readonly Faker _faker = new();
+    private readonly DateTimeOffset _fakeNow = new Faker().Date.RecentOffset();
+
+    public IEnumerator<object[]> GetEnumerator()
+    {
+        var validContractParameters = PrepareContractParameters.GetValid();
+
+        yield return new object[] { new PrepareContractRequest(Guid.Empty, validContractParameters.MinAge, validContractParameters.MaxHeight, _fakeNow), nameof(PrepareContractRequest.CustomerId) };
+        yield return new object[] { new PrepareContractRequest(Guid.NewGuid(), default, validContractParameters.MaxHeight, _fakeNow), nameof(PrepareContractRequest.CustomerAge) };
+        yield return new object[] { new PrepareContractRequest(Guid.NewGuid(), _faker.Random.Number(-100, -1), validContractParameters.MaxHeight, _fakeNow), nameof(PrepareContractRequest.CustomerAge) };
+        yield return new object[] { new PrepareContractRequest(Guid.NewGuid(), validContractParameters.MinAge, default, _fakeNow), nameof(PrepareContractRequest.CustomerHeight) };
+        yield return new object[] { new PrepareContractRequest(Guid.NewGuid(), validContractParameters.MinAge, _faker.Random.Number(-100, -1), _fakeNow), nameof(PrepareContractRequest.CustomerHeight) };
+        yield return new object[] { new PrepareContractRequest(Guid.NewGuid(), validContractParameters.MinAge, validContractParameters.MaxHeight, default), nameof(PrepareContractRequest.PreparedAt) };
+        yield return new object[] { new PrepareContractRequest(Guid.NewGuid(), validContractParameters.MinAge, validContractParameters.MaxHeight, default), nameof(PrepareContractRequest.PreparedAt) };
+    }
+
+    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+}

Chapter-3-microservice-extraction/Contracts/Src/Fitnet.Contracts.Api.UnitTests/RequestValidator/PrepareContractRequestValidatorTests.cs

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+namespace EvolutionaryArchitecture.Fitnet.Contracts.Api.UnitTests.RequestValidator;
+
+using Bogus;
+
+public sealed class PrepareContractRequestValidatorTests
+{
+    private readonly PrepareContractRequestValidator _validator = new();
+    private readonly DateTimeOffset _fakeNow = new Faker().Date.RecentOffset();
+
+    [Fact]
+    internal void Given_prepare_contract_request_validation_When_request_is_valid_Then_result_should_have_no_errors()
+    {
+        // Arrange
+        var validContractParameters = PrepareContractParameters.GetValid();
+        var request = new PrepareContractRequest(Guid.NewGuid(), validContractParameters.MinAge, validContractParameters.MaxHeight, _fakeNow);
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveAnyValidationErrors();
+    }
+
+    [Theory]
+    [ClassData(typeof(InvalidPrepareContractRequestTestCases))]
+    internal void Given_prepare_contract_request_validation_When_property_is_valid_Then_result_should_have_error(PrepareContractRequest request, string expectedInvalidPropertyName)
+    {
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor(expectedInvalidPropertyName);
+    }
+}