Made interfaces for testing

Discord.API/DiscordClient.cs

@@ -1,4 +1,5 @@
 using Discord.API.Rest;
+using Discord.API.Rest.HttpClientWrapper;
 using Serilog;
 
 namespace Discord.API;
@@ -12,16 +13,20 @@ public class DiscordClient
     private GatewayClient? Gateway;
     private TimeProvider TimeProvider;
 
-    public DiscordClient(string api_key) : this(api_key, TimeProvider.System){
-    }
-
-    internal DiscordClient(string api_key, TimeProvider time_provider){
-        this.TimeProvider=time_provider;
+    public DiscordClient(string api_key){
+        TimeProvider = TimeProvider.System;
         this.ApiKey = api_key;
         Rest = new RestClient(ApiBaseUrl, ApiKey);
         Task.Run(ConnectGateway);
     }
 
+    internal DiscordClient(string api_key, TimeProvider time_provider, IHttpClientWrapper http_client){
+        this.TimeProvider=time_provider;
+        this.ApiKey=api_key;
+        Rest = new RestClient(ApiKey, http_client);
+        Task.Run(ConnectGateway);
+    }
+
     private async Task ConnectGateway(){
         RestResponse<GetGatewayResponse> resp = await Rest.GetGateway();
 

Discord.API/Rest/HttpClientWrapper/HttpClientWrapper.cs

@@ -0,0 +1,45 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Net.Http.Headers;
+using System.Runtime.Versioning;
+
+namespace Discord.API.Rest.HttpClientWrapper;
+
+public class HttpClientWrapper : HttpClient, IHttpClientWrapper{
+    //
+        // Summary:
+        //     Initializes a new instance of the System.Net.Http.HttpClient class using a System.Net.Http.HttpClientHandler
+        //     that is disposed when this instance is disposed.
+        public HttpClientWrapper() : base() { }
+        //
+        // Summary:
+        //     Initializes a new instance of the System.Net.Http.HttpClient class with the specified
+        //     handler. The handler is disposed when this instance is disposed.
+        //
+        // Parameters:
+        //   handler:
+        //     The HTTP handler stack to use for sending requests.
+        //
+        // Exceptions:
+        //   T:System.ArgumentNullException:
+        //     The handler is null.
+        public HttpClientWrapper(HttpMessageHandler handler) : base(handler) { }
+        //
+        // Summary:
+        //     Initializes a new instance of the System.Net.Http.HttpClient class with the provided
+        //     handler, and specifies whether that handler should be disposed when this instance
+        //     is disposed.
+        //
+        // Parameters:
+        //   handler:
+        //     The System.Net.Http.HttpMessageHandler responsible for processing the HTTP response
+        //     messages.
+        //
+        //   disposeHandler:
+        //     true if the inner handler should be disposed of by HttpClient.Dispose; false
+        //     if you intend to reuse the inner handler.
+        //
+        // Exceptions:
+        //   T:System.ArgumentNullException:
+        //     The handler is null.
+        public HttpClientWrapper(HttpMessageHandler handler, bool disposeHandler) : base(handler, disposeHandler) { }
+}

Discord.API/Rest/RestClient.cs

@@ -1,20 +1,22 @@
 using System.Text.Json;
+using Discord.API.Rest.HttpClientWrapper;
 using Serilog;
-using Serilog.Core;
 
 namespace Discord.API.Rest;
 
 internal class RestClient{
 
-    private HttpClient httpClient;
+    private IHttpClientWrapper httpClient;
 
-    public RestClient(string base_url, string api_key){
-        Log.Debug("REST: Creating new rest client. Base url: {base_url}", base_url);
-        httpClient = new HttpClient(){
-            BaseAddress=new Uri(base_url)
-        };
+    public RestClient(string base_url, string api_key)
+        : this(api_key, new HttpClientWrapper.HttpClientWrapper() {BaseAddress = new Uri(base_url)})
+    { }
+
+    internal RestClient(string api_key, IHttpClientWrapper http_client){
+        Log.Debug("REST: Creating new rest client. Base url: {base_url}", http_client.BaseAddress?.AbsoluteUri);
+        httpClient = http_client;
         httpClient.DefaultRequestHeaders.Add("Authorization", $"Bot {api_key}");
-        httpClient.DefaultRequestHeaders.Add("User-Agent", $"DiscordBot ({Discord.API.StaticProperties.LibraryWebsite}, {Discord.API.StaticProperties.LibraryVersion})");
+        httpClient.DefaultRequestHeaders.Add("User-Agent", $"DiscordBot ({StaticProperties.LibraryWebsite}, {StaticProperties.LibraryVersion})");
     }
 
     public async Task<RestResponse<GetGatewayResponse>> GetGateway() =>