jellyfin/tests/Jellyfin.Providers.Tests/Manager/ItemImageProviderTests.cs
Bond_009 416894008e Minor improvements
* Removed some allocations
* Removed some useless abstractions
2021-11-03 14:02:57 +01:00

610 lines
28 KiB
C#

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.Movies;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Configuration;
using MediaBrowser.Model.Drawing;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.MediaInfo;
using MediaBrowser.Model.Providers;
using MediaBrowser.Providers.Manager;
using Microsoft.Extensions.Logging.Abstractions;
using Moq;
using Xunit;
namespace Jellyfin.Providers.Tests.Manager
{
public class ItemImageProviderTests
{
private const string TestDataImagePath = "Test Data/Images/blank{0}.jpg";
[Fact]
public void ValidateImages_PhotoEmptyProviders_NoChange()
{
var itemImageProvider = GetItemImageProvider(null, null);
var changed = itemImageProvider.ValidateImages(new Photo(), Enumerable.Empty<ILocalImageProvider>(), null);
Assert.False(changed);
}
[Fact]
public void ValidateImages_EmptyItemEmptyProviders_NoChange()
{
var itemImageProvider = GetItemImageProvider(null, null);
var changed = itemImageProvider.ValidateImages(new MovieWithScreenshots(), Enumerable.Empty<ILocalImageProvider>(), null);
Assert.False(changed);
}
private static TheoryData<ImageType, int> GetImageTypesWithCount()
{
var theoryTypes = new TheoryData<ImageType, int>
{
// minimal test cases that hit different handling
{ ImageType.Primary, 1 },
{ ImageType.Backdrop, 1 },
{ ImageType.Backdrop, 2 },
{ ImageType.Screenshot, 1 }
};
return theoryTypes;
}
[Theory]
[MemberData(nameof(GetImageTypesWithCount))]
public void ValidateImages_EmptyItemAndPopulatedProviders_AddsImages(ImageType imageType, int imageCount)
{
// Has to exist for querying DateModified time on file, results stored but not checked so not populating
BaseItem.FileSystem = Mock.Of<IFileSystem>();
var item = new MovieWithScreenshots();
var imageProvider = GetImageProvider(imageType, imageCount, true);
var itemImageProvider = GetItemImageProvider(null, null);
var changed = itemImageProvider.ValidateImages(item, new[] { imageProvider }, null);
Assert.True(changed);
Assert.Equal(imageCount, item.GetImages(imageType).Count());
}
[Theory]
[MemberData(nameof(GetImageTypesWithCount))]
public void ValidateImages_PopulatedItemWithGoodPathsAndEmptyProviders_NoChange(ImageType imageType, int imageCount)
{
var item = GetItemWithImages(imageType, imageCount, true);
var itemImageProvider = GetItemImageProvider(null, null);
var changed = itemImageProvider.ValidateImages(item, Enumerable.Empty<ILocalImageProvider>(), null);
Assert.False(changed);
Assert.Equal(imageCount, item.GetImages(imageType).Count());
}
[Theory]
[MemberData(nameof(GetImageTypesWithCount))]
public void ValidateImages_PopulatedItemWithBadPathsAndEmptyProviders_RemovesImage(ImageType imageType, int imageCount)
{
var item = GetItemWithImages(imageType, imageCount, false);
var itemImageProvider = GetItemImageProvider(null, null);
var changed = itemImageProvider.ValidateImages(item, Enumerable.Empty<ILocalImageProvider>(), null);
Assert.True(changed);
Assert.Empty(item.GetImages(imageType));
}
[Fact]
public void MergeImages_EmptyItemNewImagesEmpty_NoChange()
{
var itemImageProvider = GetItemImageProvider(null, null);
var changed = itemImageProvider.MergeImages(new MovieWithScreenshots(), Array.Empty<LocalImageInfo>());
Assert.False(changed);
}
[Theory]
[MemberData(nameof(GetImageTypesWithCount))]
public void MergeImages_PopulatedItemWithGoodPathsAndPopulatedNewImages_AddsUpdatesImages(ImageType imageType, int imageCount)
{
// valid and not valid paths - should replace the valid paths with the invalid ones
var item = GetItemWithImages(imageType, imageCount, true);
var images = GetImages(imageType, imageCount, false);
var itemImageProvider = GetItemImageProvider(null, null);
var changed = itemImageProvider.MergeImages(item, images);
Assert.True(changed);
// adds for types that allow multiple, replaces singular type images
if (item.AllowsMultipleImages(imageType))
{
Assert.Equal(imageCount * 2, item.GetImages(imageType).Count());
}
else
{
Assert.Single(item.GetImages(imageType));
Assert.Same(images[0].FileInfo.FullName, item.GetImages(imageType).First().Path);
}
}
[Theory]
[MemberData(nameof(GetImageTypesWithCount))]
public void MergeImages_PopulatedItemWithGoodPathsAndSameNewImages_NoChange(ImageType imageType, int imageCount)
{
var oldTime = new DateTime(1970, 1, 1);
// match update time with time added to item images (unix epoch)
var fileSystem = new Mock<IFileSystem>();
fileSystem.Setup(fs => fs.GetLastWriteTimeUtc(It.IsAny<FileSystemMetadata>()))
.Returns(oldTime);
BaseItem.FileSystem = fileSystem.Object;
// all valid paths - matching for strictly updating
var item = GetItemWithImages(imageType, imageCount, true);
// set size to non-zero to allow for updates to occur
foreach (var image in item.GetImages(imageType))
{
image.DateModified = oldTime;
image.Height = 1;
image.Width = 1;
}
var images = GetImages(imageType, imageCount, true);
var itemImageProvider = GetItemImageProvider(null, fileSystem);
var changed = itemImageProvider.MergeImages(item, images);
Assert.False(changed);
}
[Theory]
[MemberData(nameof(GetImageTypesWithCount))]
public void MergeImages_PopulatedItemWithGoodPathsAndSameNewImagesWithNewTimestamps_ResetsImageSizes(ImageType imageType, int imageCount)
{
var oldTime = new DateTime(1970, 1, 1);
var updatedTime = new DateTime(2021, 1, 1);
var fileSystem = new Mock<IFileSystem>();
fileSystem.Setup(fs => fs.GetLastWriteTimeUtc(It.IsAny<FileSystemMetadata>()))
.Returns(updatedTime);
BaseItem.FileSystem = fileSystem.Object;
// all valid paths - matching for strictly updating
var item = GetItemWithImages(imageType, imageCount, true);
// set size to non-zero to allow for image size reset to occur
foreach (var image in item.GetImages(imageType))
{
image.DateModified = oldTime;
image.Height = 1;
image.Width = 1;
}
var images = GetImages(imageType, imageCount, true);
var itemImageProvider = GetItemImageProvider(null, fileSystem);
var changed = itemImageProvider.MergeImages(item, images);
Assert.True(changed);
// before and after paths are the same, verify updated by size reset to 0
Assert.Equal(imageCount, item.GetImages(imageType).Count());
foreach (var image in item.GetImages(imageType))
{
Assert.Equal(updatedTime, image.DateModified);
Assert.Equal(0, image.Height);
Assert.Equal(0, image.Width);
}
}
[Theory]
[InlineData(ImageType.Primary, 1, false)]
[InlineData(ImageType.Backdrop, 2, false)]
[InlineData(ImageType.Screenshot, 2, false)]
[InlineData(ImageType.Primary, 1, true)]
[InlineData(ImageType.Backdrop, 2, true)]
[InlineData(ImageType.Screenshot, 2, true)]
public async void RefreshImages_PopulatedItemPopulatedProviderDynamic_UpdatesImagesIfForced(ImageType imageType, int imageCount, bool forceRefresh)
{
var item = GetItemWithImages(imageType, imageCount, false);
var libraryOptions = GetLibraryOptions(item, imageType, imageCount);
var imageResponse = new DynamicImageResponse
{
HasImage = true,
Format = ImageFormat.Jpg,
Path = "url path",
Protocol = MediaProtocol.Http
};
var dynamicProvider = new Mock<IDynamicImageProvider>(MockBehavior.Strict);
dynamicProvider.Setup(rp => rp.Name).Returns("MockDynamicProvider");
dynamicProvider.Setup(rp => rp.GetSupportedImages(item))
.Returns(new[] { imageType });
dynamicProvider.Setup(rp => rp.GetImage(item, imageType, It.IsAny<CancellationToken>()))
.ReturnsAsync(imageResponse);
var refreshOptions = forceRefresh
? new ImageRefreshOptions(null)
{
ImageRefreshMode = MetadataRefreshMode.FullRefresh,
ReplaceAllImages = true
}
: new ImageRefreshOptions(null);
var itemImageProvider = GetItemImageProvider(null, new Mock<IFileSystem>());
var result = await itemImageProvider.RefreshImages(item, libraryOptions, new List<IImageProvider> { dynamicProvider.Object }, refreshOptions, CancellationToken.None);
Assert.Equal(forceRefresh, result.UpdateType.HasFlag(ItemUpdateType.ImageUpdate));
if (forceRefresh)
{
// replaces multi-types
Assert.Single(item.GetImages(imageType));
}
else
{
// adds to multi-types if room
Assert.Equal(imageCount, item.GetImages(imageType).Count());
}
}
[Theory]
[InlineData(ImageType.Primary, 1, true, MediaProtocol.Http)]
[InlineData(ImageType.Backdrop, 2, true, MediaProtocol.Http)]
[InlineData(ImageType.Primary, 1, true, MediaProtocol.File)]
[InlineData(ImageType.Backdrop, 2, true, MediaProtocol.File)]
[InlineData(ImageType.Primary, 1, false, MediaProtocol.File)]
[InlineData(ImageType.Backdrop, 2, false, MediaProtocol.File)]
public async void RefreshImages_EmptyItemPopulatedProviderDynamic_AddsImages(ImageType imageType, int imageCount, bool responseHasPath, MediaProtocol protocol)
{
// Has to exist for querying DateModified time on file, results stored but not checked so not populating
BaseItem.FileSystem = Mock.Of<IFileSystem>();
var item = new MovieWithScreenshots();
var libraryOptions = GetLibraryOptions(item, imageType, imageCount);
// Path must exist if set: is read in as a stream by AsyncFile.OpenRead
var imageResponse = new DynamicImageResponse
{
HasImage = true,
Format = ImageFormat.Jpg,
Path = responseHasPath ? string.Format(CultureInfo.InvariantCulture, TestDataImagePath, 0) : null,
Protocol = protocol
};
var dynamicProvider = new Mock<IDynamicImageProvider>(MockBehavior.Strict);
dynamicProvider.Setup(rp => rp.Name).Returns("MockDynamicProvider");
dynamicProvider.Setup(rp => rp.GetSupportedImages(item))
.Returns(new[] { imageType });
dynamicProvider.Setup(rp => rp.GetImage(item, imageType, It.IsAny<CancellationToken>()))
.ReturnsAsync(imageResponse);
var refreshOptions = new ImageRefreshOptions(null);
var providerManager = new Mock<IProviderManager>(MockBehavior.Strict);
providerManager.Setup(pm => pm.SaveImage(item, It.IsAny<Stream>(), It.IsAny<string>(), imageType, null, It.IsAny<CancellationToken>()))
.Callback<BaseItem, Stream, string, ImageType, int?, CancellationToken>((callbackItem, _, _, callbackType, _, _) => callbackItem.SetImagePath(callbackType, 0, new FileSystemMetadata()))
.Returns(Task.CompletedTask);
var itemImageProvider = GetItemImageProvider(providerManager.Object, null);
var result = await itemImageProvider.RefreshImages(item, libraryOptions, new List<IImageProvider> { dynamicProvider.Object }, refreshOptions, CancellationToken.None);
Assert.True(result.UpdateType.HasFlag(ItemUpdateType.ImageUpdate));
// dynamic provider unable to return multiple images
Assert.Single(item.GetImages(imageType));
if (protocol == MediaProtocol.Http)
{
Assert.Equal(imageResponse.Path, item.GetImagePath(imageType, 0));
}
}
[Theory]
[InlineData(ImageType.Primary, 1, false)]
[InlineData(ImageType.Backdrop, 1, false)]
[InlineData(ImageType.Backdrop, 2, false)]
[InlineData(ImageType.Screenshot, 2, false)]
[InlineData(ImageType.Primary, 1, true)]
[InlineData(ImageType.Backdrop, 1, true)]
[InlineData(ImageType.Backdrop, 2, true)]
[InlineData(ImageType.Screenshot, 2, true)]
public async void RefreshImages_PopulatedItemPopulatedProviderRemote_UpdatesImagesIfForced(ImageType imageType, int imageCount, bool forceRefresh)
{
var item = GetItemWithImages(imageType, imageCount, false);
var libraryOptions = GetLibraryOptions(item, imageType, imageCount);
var remoteProvider = new Mock<IRemoteImageProvider>(MockBehavior.Strict);
remoteProvider.Setup(rp => rp.Name).Returns("MockRemoteProvider");
remoteProvider.Setup(rp => rp.GetSupportedImages(item))
.Returns(new[] { imageType });
var refreshOptions = forceRefresh
? new ImageRefreshOptions(null)
{
ImageRefreshMode = MetadataRefreshMode.FullRefresh,
ReplaceAllImages = true
}
: new ImageRefreshOptions(null);
var remoteInfo = new RemoteImageInfo[imageCount];
for (int i = 0; i < imageCount; i++)
{
remoteInfo[i] = new RemoteImageInfo
{
Type = imageType,
Url = "image url " + i,
Width = 1 // min width is set to 0, this will always pass
};
}
var providerManager = new Mock<IProviderManager>(MockBehavior.Strict);
providerManager.Setup(pm => pm.GetAvailableRemoteImages(It.IsAny<BaseItem>(), It.IsAny<RemoteImageQuery>(), It.IsAny<CancellationToken>()))
.ReturnsAsync(remoteInfo);
var itemImageProvider = GetItemImageProvider(providerManager.Object, new Mock<IFileSystem>());
var result = await itemImageProvider.RefreshImages(item, libraryOptions, new List<IImageProvider> { remoteProvider.Object }, refreshOptions, CancellationToken.None);
Assert.Equal(forceRefresh, result.UpdateType.HasFlag(ItemUpdateType.ImageUpdate));
Assert.Equal(imageCount, item.GetImages(imageType).Count());
foreach (var image in item.GetImages(imageType))
{
if (forceRefresh)
{
Assert.Matches(@"image url [0-9]", image.Path);
}
else
{
Assert.DoesNotMatch(@"image url [0-9]", image.Path);
}
}
}
[Theory]
[InlineData(ImageType.Primary, 0, false)] // singular type only fetches if type is missing from item, no caching
[InlineData(ImageType.Backdrop, 0, false)] // empty item, no cache to check
[InlineData(ImageType.Backdrop, 1, false)] // populated item, cached so no download
[InlineData(ImageType.Backdrop, 1, true)] // populated item, forced to download
public async void RefreshImages_NonStubItemPopulatedProviderRemote_DownloadsIfNecessary(ImageType imageType, int initialImageCount, bool fullRefresh)
{
var targetImageCount = 1;
// Set path and media source manager so images will be downloaded (EnableImageStub will return false)
var item = GetItemWithImages(imageType, initialImageCount, false);
item.Path = "non-empty path";
BaseItem.MediaSourceManager = Mock.Of<IMediaSourceManager>();
// seek 2 so it won't short-circuit out of downloading when populated
var libraryOptions = GetLibraryOptions(item, imageType, 2);
const string Content = "Content";
var remoteProvider = new Mock<IRemoteImageProvider>(MockBehavior.Strict);
remoteProvider.Setup(rp => rp.Name).Returns("MockRemoteProvider");
remoteProvider.Setup(rp => rp.GetSupportedImages(item))
.Returns(new[] { imageType });
remoteProvider.Setup(rp => rp.GetImageResponse(It.IsAny<string>(), It.IsAny<CancellationToken>()))
.ReturnsAsync((string url, CancellationToken _) => new HttpResponseMessage
{
ReasonPhrase = url,
StatusCode = HttpStatusCode.OK,
Content = new StringContent(Content, Encoding.UTF8, "image/jpeg")
});
var refreshOptions = fullRefresh
? new ImageRefreshOptions(null)
{
ImageRefreshMode = MetadataRefreshMode.FullRefresh,
ReplaceAllImages = true
}
: new ImageRefreshOptions(null);
var remoteInfo = new RemoteImageInfo[targetImageCount];
for (int i = 0; i < targetImageCount; i++)
{
remoteInfo[i] = new RemoteImageInfo()
{
Type = imageType,
Url = "image url " + i,
Width = 1 // min width is set to 0, this will always pass
};
}
var providerManager = new Mock<IProviderManager>(MockBehavior.Strict);
providerManager.Setup(pm => pm.GetAvailableRemoteImages(It.IsAny<BaseItem>(), It.IsAny<RemoteImageQuery>(), It.IsAny<CancellationToken>()))
.ReturnsAsync(remoteInfo);
providerManager.Setup(pm => pm.SaveImage(item, It.IsAny<Stream>(), It.IsAny<string>(), imageType, null, It.IsAny<CancellationToken>()))
.Callback<BaseItem, Stream, string, ImageType, int?, CancellationToken>((callbackItem, _, _, callbackType, _, _) =>
callbackItem.SetImagePath(callbackType, callbackItem.AllowsMultipleImages(callbackType) ? callbackItem.GetImages(callbackType).Count() : 0, new FileSystemMetadata()))
.Returns(Task.CompletedTask);
var fileSystem = new Mock<IFileSystem>();
// match reported file size to image content length - condition for skipping already downloaded multi-images
fileSystem.Setup(fs => fs.GetFileInfo(It.IsAny<string>()))
.Returns(new FileSystemMetadata { Length = Content.Length });
var itemImageProvider = GetItemImageProvider(providerManager.Object, fileSystem);
var result = await itemImageProvider.RefreshImages(item, libraryOptions, new List<IImageProvider> { remoteProvider.Object }, refreshOptions, CancellationToken.None);
Assert.Equal(initialImageCount == 0 || fullRefresh, result.UpdateType.HasFlag(ItemUpdateType.ImageUpdate));
Assert.Equal(targetImageCount, item.GetImages(imageType).Count());
}
[Theory]
[MemberData(nameof(GetImageTypesWithCount))]
public async void RefreshImages_EmptyItemPopulatedProviderRemoteExtras_LimitsImages(ImageType imageType, int imageCount)
{
var item = new MovieWithScreenshots();
var libraryOptions = GetLibraryOptions(item, imageType, imageCount);
var remoteProvider = new Mock<IRemoteImageProvider>(MockBehavior.Strict);
remoteProvider.Setup(rp => rp.Name).Returns("MockRemoteProvider");
remoteProvider.Setup(rp => rp.GetSupportedImages(item))
.Returns(new[] { imageType });
var refreshOptions = new ImageRefreshOptions(null);
// populate remote with double the required images to verify count is trimmed to the library option count
var remoteInfoCount = imageCount * 2;
var remoteInfo = new RemoteImageInfo[remoteInfoCount];
for (int i = 0; i < remoteInfoCount; i++)
{
remoteInfo[i] = new RemoteImageInfo()
{
Type = imageType,
Url = "image url " + i,
Width = 1 // min width is set to 0, this will always pass
};
}
var providerManager = new Mock<IProviderManager>(MockBehavior.Strict);
providerManager.Setup(pm => pm.GetAvailableRemoteImages(It.IsAny<BaseItem>(), It.IsAny<RemoteImageQuery>(), It.IsAny<CancellationToken>()))
.ReturnsAsync(remoteInfo);
var itemImageProvider = GetItemImageProvider(providerManager.Object, null);
var result = await itemImageProvider.RefreshImages(item, libraryOptions, new List<IImageProvider> { remoteProvider.Object }, refreshOptions, CancellationToken.None);
Assert.True(result.UpdateType.HasFlag(ItemUpdateType.ImageUpdate));
var actualImages = item.GetImages(imageType).ToList();
Assert.Equal(imageCount, actualImages.Count);
// images from the provider manager are sorted by preference (earlier images are higher priority) so we can verify that low url numbers are chosen
foreach (var image in actualImages)
{
var index = int.Parse(Regex.Match(image.Path, @"[0-9]+").Value, NumberStyles.Integer, CultureInfo.InvariantCulture);
Assert.True(index < imageCount);
}
}
[Theory]
[MemberData(nameof(GetImageTypesWithCount))]
public async void RefreshImages_PopulatedItemEmptyProviderRemoteFullRefresh_DoesntClearImages(ImageType imageType, int imageCount)
{
var item = GetItemWithImages(imageType, imageCount, false);
var libraryOptions = GetLibraryOptions(item, imageType, imageCount);
var remoteProvider = new Mock<IRemoteImageProvider>(MockBehavior.Strict);
remoteProvider.Setup(rp => rp.Name).Returns("MockRemoteProvider");
remoteProvider.Setup(rp => rp.GetSupportedImages(item))
.Returns(new[] { imageType });
var refreshOptions = new ImageRefreshOptions(null)
{
ImageRefreshMode = MetadataRefreshMode.FullRefresh,
ReplaceAllImages = true
};
var itemImageProvider = GetItemImageProvider(Mock.Of<IProviderManager>(), null);
var result = await itemImageProvider.RefreshImages(item, libraryOptions, new List<IImageProvider> { remoteProvider.Object }, refreshOptions, CancellationToken.None);
Assert.False(result.UpdateType.HasFlag(ItemUpdateType.ImageUpdate));
Assert.Equal(imageCount, item.GetImages(imageType).Count());
}
private static ItemImageProvider GetItemImageProvider(IProviderManager? providerManager, Mock<IFileSystem>? mockFileSystem)
{
// strict to ensure this isn't accidentally used where a prepared mock is intended
providerManager ??= Mock.Of<IProviderManager>(MockBehavior.Strict);
// BaseItem.ValidateImages depends on the directory service being able to list directory contents, give it the expected valid file paths
mockFileSystem ??= new Mock<IFileSystem>(MockBehavior.Strict);
mockFileSystem.Setup(fs => fs.GetFilePaths(It.IsAny<string>(), It.IsAny<bool>()))
.Returns(new[]
{
string.Format(CultureInfo.InvariantCulture, TestDataImagePath, 0),
string.Format(CultureInfo.InvariantCulture, TestDataImagePath, 1)
});
return new ItemImageProvider(new NullLogger<ItemImageProvider>(), providerManager, mockFileSystem.Object);
}
private static BaseItem GetItemWithImages(ImageType type, int count, bool validPaths)
{
// Has to exist for querying DateModified time on file, results stored but not checked so not populating
BaseItem.FileSystem ??= Mock.Of<IFileSystem>();
var item = new MovieWithScreenshots();
var path = validPaths ? TestDataImagePath : "invalid path {0}";
for (int i = 0; i < count; i++)
{
item.SetImagePath(type, i, new FileSystemMetadata
{
FullName = string.Format(CultureInfo.InvariantCulture, path, i),
});
}
return item;
}
private static ILocalImageProvider GetImageProvider(ImageType type, int count, bool validPaths)
{
var images = GetImages(type, count, validPaths);
var imageProvider = new Mock<ILocalImageProvider>();
imageProvider.Setup(ip => ip.GetImages(It.IsAny<BaseItem>(), It.IsAny<IDirectoryService>()))
.Returns(images);
return imageProvider.Object;
}
/// <summary>
/// Creates a list of <see cref="LocalImageInfo"/> references of the specified type and size, optionally pointing to files that exist.
/// </summary>
private static LocalImageInfo[] GetImages(ImageType type, int count, bool validPaths)
{
var path = validPaths ? TestDataImagePath : "invalid path {0}";
var images = new LocalImageInfo[count];
for (int i = 0; i < count; i++)
{
images[i] = new LocalImageInfo
{
Type = type,
FileInfo = new FileSystemMetadata
{
FullName = string.Format(CultureInfo.InvariantCulture, path, i)
}
};
}
return images;
}
/// <summary>
/// Generates a <see cref="LibraryOptions"/> object that will allow for the requested number of images for the target type.
/// </summary>
private static LibraryOptions GetLibraryOptions(BaseItem item, ImageType type, int count)
{
return new LibraryOptions
{
TypeOptions = new[]
{
new TypeOptions
{
Type = item.GetType().Name,
ImageOptions = new[]
{
new ImageOption
{
Type = type,
Limit = count,
MinWidth = 0
}
}
}
}
};
}
// Create a class that implements IHasScreenshots for testing since no BaseItem class is also IHasScreenshots
private class MovieWithScreenshots : Movie, IHasScreenshots
{
// No contents
}
}
}