BlazorでのbUnitテスト

public class BUnitTest : TestContext
{
	[Fact]
	public void SampleTest()
	{
		// Arrange
		var cut = RenderComponent<Sample>();
		var button = cut.Find("button");
		var result = cut.Find("#result");

		// Assert
		Assert.Equal("検索", button.InnerHtml);
		Assert.Equal("検索してください", result.InnerHtml);
	}
}

	[Fact]
	public void ParameterTest()
	{
		// Arange
		var cut = RenderComponent<Sample>(p => p.Add(m => m.FirstMessage, "test message"));
		var result = cut.Find("#result");

		// Assert
		Assert.Equal("test message", result.InnerHtml);
	}

	[Fact]
	public void MethodTest()
	{
		// Arrange
		var mock = Services.AddMockHttpClient();
		var response = new List<Person> { new Person { Name = "Test", Country = "Brazil" } };
		var jsonResponse = JsonSerializer.Serialize(response);
		mock.When("https://localhost:7013/users*").Respond("application/json", jsonResponse);
		var cut = RenderComponent<Sample>();
		var button = cut.Find("button");

		// Act
		button.Click();
		cut.Render();
		var contents = cut.FindAll(".col-2");

		// Assert
		Assert.NotEmpty(contents);
		Assert.Equal("Test", contents[2].InnerHtml);
		Assert.Equal("Brazil", contents[3].InnerHtml);
	}

public static class MockHelper
{
	public static MockHttpMessageHandler AddMockHttpClient(this TestServiceProvider services)
	{
		var mockHttpHandler = new MockHttpMessageHandler();
		var httpClient = mockHttpHandler.ToHttpClient();
		services.AddSingleton<HttpClient>(httpClient);
		return mockHttpHandler;
	}
}

@inject ILogger<Sample> logger
@inject HttpClient httpClient

<h3>ユーザー情報</h3>

<EditForm Model="InputForm" OnSubmit="GetUsersAsync">
	<div class="form-control">
		<label for="countrySelect">国</label>
		<InputSelect id="countrySelect" class="form-select" @bind-Value="InputForm.Country">
			<option value="Japan">日本</option>
			<option value="US">アメリカ</option>
			<option value="Italy">イタリア</option>
			<option value="Frnce">フランス</option>
		</InputSelect>
	</div>
	<button class="btn btn-primary ms-3 mt-1">検索</button>
</EditForm>

<div id="result" class="container mt-3">
	@if (People is not null && People.Any())
	{
		<div class="row">
			<div class="col-2 border border-black">名前</div>
			<div class="col-2 border border-black">国</div>
		</div>
		@foreach (var person in People)
		{
			<div class="row">
				<div class="col-2 border border-black">@person.Name</div>
				<div class="col-2 border border-black">@person.Country</div>
			</div>
		}
	}
	else
	{
		@message
	}
</div>

@code {
	[Parameter]
	public string? FirstMessage { get; set; }

	private Form InputForm { get; set; } = new();
	private List<Person>? People;
	private string? message;

	protected override void OnInitialized()
	{
		message = FirstMessage ?? "検索してください";
	}

	private async Task GetUsersAsync()
	{
		logger.LogInformation($"country={InputForm.Country}");

		var r = await httpClient.GetAsync($"https://localhost:7013/users?country={InputForm.Country}");
		var j = await r.Content.ReadAsStringAsync();
		People = JsonSerializer.Deserialize<List<Person>>(j);

		if (People is null || !People.Any()) message = "該当のユーザーは存在しません";
	}

	private class Form
	{
		public string? Country { get; set; } = "Japan";
	}
}