// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Xunit;
 
namespace Microsoft.Extensions.ServiceDiscovery.Dns.Tests;
 
public class DnsServicePublicApiTests
{
    [Fact]
    public void AddDnsSrvServiceEndpointProviderShouldThrowWhenServicesIsNull()
    {
        IServiceCollection services = null!;
 
        var action = () => services.AddDnsSrvServiceEndpointProvider();
 
        var exception = Assert.Throws<ArgumentNullException>(action);
        Assert.Equal(nameof(services), exception.ParamName);
    }
 
    [Fact]
    public void AddDnsSrvServiceEndpointProviderWithConfigureOptionsShouldThrowWhenServicesIsNull()
    {
        IServiceCollection services = null!;
        Action<DnsSrvServiceEndpointProviderOptions> configureOptions = (_) => { };
 
        var action = () => services.AddDnsSrvServiceEndpointProvider(configureOptions);
 
        var exception = Assert.Throws<ArgumentNullException>(action);
        Assert.Equal(nameof(services), exception.ParamName);
    }
 
    [Fact]
    public void AddDnsSrvServiceEndpointProviderWithConfigureOptionsShouldThrowWhenConfigureOptionsIsNull()
    {
        IServiceCollection services = new ServiceCollection();
        Action<DnsSrvServiceEndpointProviderOptions> configureOptions = null!;
 
        var action = () => services.AddDnsSrvServiceEndpointProvider(configureOptions);
 
        var exception = Assert.Throws<ArgumentNullException>(action);
        Assert.Equal(nameof(configureOptions), exception.ParamName);
    }
 
    [Fact]
    public void AddDnsServiceEndpointProviderShouldThrowWhenServicesIsNull()
    {
        IServiceCollection services = null!;
 
        var action = () => services.AddDnsServiceEndpointProvider();
 
        var exception = Assert.Throws<ArgumentNullException>(action);
        Assert.Equal(nameof(services), exception.ParamName);
    }
 
    [Fact]
    public void AddDnsServiceEndpointProviderWithConfigureOptionsShouldThrowWhenServicesIsNull()
    {
        IServiceCollection services = null!;
        Action<DnsServiceEndpointProviderOptions> configureOptions = (_) => { };
 
        var action = () => services.AddDnsServiceEndpointProvider(configureOptions);
 
        var exception = Assert.Throws<ArgumentNullException>(action);
        Assert.Equal(nameof(services), exception.ParamName);
    }
 
    [Fact]
    public void ConfigureDnsResolverShouldThrowWhenServicesIsNull()
    {
        IServiceCollection services = null!;
 
        var action = () => services.ConfigureDnsResolver(_ => { });
 
        var exception = Assert.Throws<ArgumentNullException>(action);
        Assert.Equal(nameof(services), exception.ParamName);
    }
 
    [Fact]
    public void ConfigureDnsResolverShouldThrowWhenConfigureOptionsIsNull()
    {
        IServiceCollection services = new ServiceCollection();
        Action<DnsResolverOptions> configureOptions = null!;
 
        var action = () => services.ConfigureDnsResolver(configureOptions);
 
        var exception = Assert.Throws<ArgumentNullException>(action);
        Assert.Equal(nameof(configureOptions), exception.ParamName);
    }
}