Implementing default delivery channel matching

src/protagonist/API.Tests/Features/DeliveryChannels/DefaultDeliveryChannelRepositoryTests.cs

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+using System;
+using System.Linq;
+using API.Features.DeliveryChannels;
+using API.Tests.Integration.Infrastructure;
+using DLCS.Core.Caching;
+using DLCS.Model.DeliveryChannels;
+using DLCS.Model.Policies;
+using DLCS.Repository;
+using LazyCache.Mocks;
+using Microsoft.Extensions.Logging.Abstractions;
+using Microsoft.Extensions.Options;
+using Test.Helpers.Integration;
+
+namespace API.Tests.Features.DeliveryChannels;
+
+[Trait("Category", "Database")]
+[Collection(CollectionDefinitions.DatabaseCollection.CollectionName)]
+public class DefaultDeliveryChannelRepositoryTests
+{
+    private readonly DlcsContext dbContext;
+    private readonly DefaultDeliveryChannelRepository sut;
+
+    public DefaultDeliveryChannelRepositoryTests(DlcsDatabaseFixture dbFixture)
+    {
+        dbContext = dbFixture.DbContext;
+        sut = new DefaultDeliveryChannelRepository(new MockCachingService(), new NullLogger<DefaultDeliveryChannelRepository>(), 
+            Options.Create(new CacheSettings()), dbFixture.DbContext);
+
+        dbFixture.CleanUp();
+
+        var newPolicy = dbContext.DeliveryChannelPolicies.Add(new DeliveryChannelPolicy()
+        {
+            Created = DateTime.UtcNow,
+            Modified = DateTime.UtcNow,
+            DisplayName = "test policy - space specific",
+            PolicyData = null,
+            Name = "space-specific-image",
+            Channel = "iiif-img",
+            Customer = 2,
+            Id = 260
+        });
+
+       dbContext.DefaultDeliveryChannels.Add(new DefaultDeliveryChannel
+        {
+            Space = 2,
+            Customer = 2,
+            DeliveryChannelPolicyId = newPolicy.Entity.Id,
+            MediaType = "image/tiff"
+        });
+
+       dbContext.DefaultDeliveryChannels.Add(new DefaultDeliveryChannel
+       {
+           Space = 0,
+           Customer = 2,
+           DeliveryChannelPolicyId = 1,
+           MediaType = "image/*"
+       });
+
+       dbContext.SaveChanges();
+    }
+
+    [Fact]
+    public void MatchedDeliveryChannels_ReturnsAllDeliveryChannelPolicies_WhenCalled()
+    {
+        // Arrange and Act
+        var matches = sut.MatchedDeliveryChannels("image/tiff", 1, 2);
+
+        // Assert
+        matches.Count.Should().Be(1);
+        matches.Count(x => x.Channel == "iiif-img").Should().Be(1);
+    }
+
+    [Fact]
+    public void MatchedDeliveryChannels_ShouldNotMatchAnything_WhenCalledWithInvalidMediaType()
+    {
+        // Arrange and Act
+        var matches = sut.MatchedDeliveryChannels("notValid/tiff", 1, 2);
+
+        // Assert
+        matches.Count.Should().Be(0);
+    }
+
+    [Fact]
+    public void MatchDeliveryChannelPolicyForChannel_MatchesDeliveryChannel_WhenMatchAvailable()
+    {
+        // Arrange and Act
+        var matches = sut.MatchDeliveryChannelPolicyForChannel("image/tiff", 1, 2, "iiif-img");
+
+        // Assert
+        matches.Should().NotBeNull();
+    }
+
+    [Fact]
+    public void MatchDeliveryChannelPolicyForChannel_ThrowsException_WhenNotMatched()
+    {
+        // Arrange and Act
+        Action action = () => sut.MatchDeliveryChannelPolicyForChannel("notMatched/tiff", 1, 2, "iiif-img");
+
+        // Assert
+        action.Should().ThrowExactly<InvalidOperationException>();
+    }
+}

src/protagonist/API.Tests/Features/DeliveryChannels/DeliveryChannelPoliciesTests.cs

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+using System;
+using API.Features.DeliveryChannels;
+using API.Tests.Integration.Infrastructure;
+using DLCS.Core.Caching;
+using DLCS.Model.Policies;
+using DLCS.Repository;
+using LazyCache.Mocks;
+using Microsoft.Extensions.Logging.Abstractions;
+using Microsoft.Extensions.Options;
+using Test.Helpers.Integration;
+
+namespace API.Tests.Features.DeliveryChannels;
+
+[Trait("Category", "Database")]
+[Collection(CollectionDefinitions.DatabaseCollection.CollectionName)]
+public class DeliveryChannelPoliciesTests
+{
+    private readonly DlcsContext dbContext;
+    private readonly DeliveryChannelPolicyRepository sut;
+
+    public DeliveryChannelPoliciesTests(DlcsDatabaseFixture dbFixture)
+    {
+        dbContext = dbFixture.DbContext;
+        sut = new DeliveryChannelPolicyRepository(new MockCachingService() ,new NullLogger<DeliveryChannelPolicyRepository>(), Options.Create(new CacheSettings()), dbFixture.DbContext);
+
+        dbFixture.CleanUp();
+
+        dbContext.DeliveryChannelPolicies.Add(new DeliveryChannelPolicy()
+        {
+            Created = DateTime.UtcNow,
+            Modified = DateTime.UtcNow,
+            DisplayName = "test policy - space specific",
+            PolicyData = null,
+            Name = "space-specific-image",
+            Channel = "iiif-img",
+            Customer = 2,
+            Id = 260
+        });
+
+        dbContext.SaveChanges();
+    }
+
+    [Theory]
+    [InlineData("space-specific-image")]
+    [InlineData("channel/space-specific-image")]
+    [InlineData("https://dlcs.api/customers/2/deliveryChannelPolicies/iiif-img/space-specific-image")]
+    public void RetrieveDeliveryChannelPolicy_RetrievesACustomerSpecificPolicy(string policy)
+    {
+        // Arrange and Act
+        var deliveryChannelPolicy = sut.RetrieveDeliveryChannelPolicy(2, "iiif-img", policy);
+
+        // Assert
+        deliveryChannelPolicy.Channel.Should().Be("iiif-img");
+        deliveryChannelPolicy.Customer.Should().Be(2);
+    }
+
+    [Fact]
+    public void RetrieveDeliveryChannelPolicy_RetrievesADefaultPolicy()
+    {
+        // Arrange and Act
+        var policy = sut.RetrieveDeliveryChannelPolicy(2, "iiif-img", "default");
+
+        // Assert
+        policy.Channel.Should().Be("iiif-img");
+        policy.Customer.Should().Be(1);
+    }
+
+    [Fact]
+    public void RetrieveDeliveryChannelPolicy_RetrieveNonExistentPolicy()
+    {
+        // Arrange and Act
+        Action action = () =>  sut.RetrieveDeliveryChannelPolicy(2, "notAChannel", "notAPolicy");
+
+        // Assert
+        action.Should()
+            .Throw<InvalidOperationException>();
+    }
+}