105 lines
3.9 KiB
C#
105 lines
3.9 KiB
C#
using PostIt.Models;
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using PostIt.Services;
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using PostIt.ViewModels;
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namespace PostIt.Tests;
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public class PostItViewModelTests
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{
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[Fact]
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public void SearchCommand_filters_posts_by_title_article_or_author()
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{
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// MainPageViewModel no longer owns a BlogApiClient instance by
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// default; tests construct one with a fake YavscApiClient that
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// throws on any call (we never call the API in this test).
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var fakeApi = new ThrowingYavscApiClient();
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var blog = new BlogApiClient(fakeApi);
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var viewModel = new MainPageViewModel(blog);
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viewModel.Posts.Add(new BlogPost { Id = 1, Title = "First post", Article = "Hello world", AuthorId = "alice" });
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viewModel.Posts.Add(new BlogPost { Id = 2, Title = "Second post", Article = "Nothing here", AuthorId = "bob" });
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viewModel.Posts.Add(new BlogPost { Id = 3, Title = "Third post", Article = "Search me", AuthorId = "carol" });
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viewModel.SearchText = "search";
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viewModel.SearchCommand.Execute(null);
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Assert.Single(viewModel.FilteredPosts);
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Assert.Equal(3, viewModel.FilteredPosts[0].Id);
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viewModel.SearchText = "bob";
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viewModel.SearchCommand.Execute(null);
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Assert.Single(viewModel.FilteredPosts);
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Assert.Equal(2, viewModel.FilteredPosts[0].Id);
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}
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[Fact]
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public async Task BlogApiClient_GetPostsAsync_returns_posts_from_api()
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{
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// The new BlogApiClient delegates transport to YavscApiClient.
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// We feed it a fake YavscApiClient that returns the expected
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// list straight from CallAsync.
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var expected = new List<BlogPost>
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{
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new() { Id = 1, Title = "Hello" },
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new() { Id = 2, Title = "World" }
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};
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var api = new StubYavscApiClient(expected);
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var blog = new BlogApiClient(api);
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var posts = await blog.GetPostsAsync();
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Assert.Equal(2, posts.Count);
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Assert.Equal("Hello", posts[0].Title);
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}
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/// <summary>Test fake that always throws if the API is invoked.</summary>
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private sealed class ThrowingYavscApiClient : YavscApiClient
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{
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public ThrowingYavscApiClient() : base(
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new Settings
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{
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Scopes = new[] { "openid" },
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Authentication = new AuthenticationSettings
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{
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Authority = "https://stub.invalid",
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ClientId = "stub",
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},
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},
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new TokenStore(System.IO.Path.GetTempFileName()))
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{ }
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public override Task<T> CallAsync<T>(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
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=> throw new System.InvalidOperationException("ThrowingYavscApiClient: API not stubbed.");
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}
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/// <summary>Test fake that hands back a canned list of posts from any CallAsync.</summary>
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private sealed class StubYavscApiClient : YavscApiClient
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{
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private readonly List<BlogPost> _posts;
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public StubYavscApiClient(List<BlogPost> posts)
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: base(
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new Settings
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{
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Scopes = new[] { "openid" },
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Authentication = new AuthenticationSettings
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{
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Authority = "https://stub.invalid",
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ClientId = "stub",
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},
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},
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new TokenStore(System.IO.Path.GetTempFileName()))
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{
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_posts = posts;
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}
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public override Task<T> CallAsync<T>(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
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{
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// The canned fake only knows about a list of posts; the
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// BlogApiClient test asserts on that list directly.
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if (typeof(T) == typeof(List<BlogPost>))
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return Task.FromResult((T)(object)_posts);
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return Task.FromResult(default(T)!);
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}
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}
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}
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