c# - xUnit TestServer MVC 核心

Question

我正在尝试设置一个测试来获取我的所有产品，但我得到了 ArgumentNullException 但我不明白为什么，我最近开始研究这个所以......

这是错误消息

Message: System.ArgumentNullException : Value cannot be null.
Parameter name: connectionString

private readonly TestServer server;
private readonly HttpClient client;

public ProductControllerIntegrationTests()
{
    server = new TestServer(new WebHostBuilder()
        .UseStartup<Startup>());
    client = server.CreateClient();
}

[Fact]
public async Task Product_Get_All()
{
    var response = await client.GetAsync("/api/Products");
    response.EnsureSuccessStatusCode();
    var responseString = await response.Content.ReadAsStringAsync();
    var products = JsonConvert.DeserializeObject<IEnumerable<Product>>(responseString);
    products.Count().Should().Be(12);
}

提前致谢!

Answer 1

Message: System.ArgumentNullException : Value cannot be null. Parameter name: connectionString

此错误是由于您在创建时没有指定配置引起的 TestServer 。在产品项目中，WebHost.CreateDefaultBuilder(args)在 Program.cs将配置从“appsettings.json”加载 Microsoft.Extensions.Configuration.IConfiguration。

如果您想使用生产 appsettings.json 进行测试，您可以尝试如下:

        public ProductControllerIntegrationTests()
    {
        var configuration = new ConfigurationBuilder()
            .AddJsonFile("appsettings.json")
            .Build();

        server = new TestServer(new WebHostBuilder()
            .UseConfiguration(configuration)
            .UseStartup<Startup>()
            );
        client = server.CreateClient();
    }