move parsing logic into new function for testing

src/Discord.Net.Webhook/DiscordWebhookClient.cs

@@ -59,30 +59,10 @@ namespace Discord.Webhook
         /// <exception cref="ArgumentNullException">Thrown if the <paramref name="webhookUrl"/> is null or whitespace.</exception>
         public DiscordWebhookClient(string webhookUrl, DiscordRestConfig config) : this(config)
         {
-            if (string.IsNullOrWhiteSpace(webhookUrl))
-                throw new ArgumentNullException(paramName: nameof(webhookUrl), message:
-                    "The given webhook Url cannot be null or whitespace.");
-
-            // thrown when groups are not populated/valid, or when there is no match
-            ArgumentException ex(string reason = null)
-                => new ArgumentException(paramName: nameof(webhookUrl), message:
-                $"The given webhook Url was not in a valid format. {reason}");
-            var match = WebhookUrlRegex.Match(webhookUrl);
-            if (match != null)
-            {
-                // ensure that the first group is a ulong, set the _webhookId
-                // 0th group is always the entire match, so start at index 1
-                if (!(match.Groups[1].Success && ulong.TryParse(match.Groups[1].Value, out _webhookId)))
-                    throw ex("The webhook Id could not be parsed.");
-
-                if (!match.Groups[2].Success)
-                    throw ex("The webhook token could not be parsed.");
-
-                ApiClient.LoginAsync(TokenType.Webhook, match.Groups[2].Value).GetAwaiter().GetResult();
-                Webhook = WebhookClientHelper.GetWebhookAsync(this, _webhookId).GetAwaiter().GetResult();
-            }
-            else
-                throw ex();
+            string token;
+            ParseWebhookUrl(webhookUrl, out _webhookId, out token);
+            ApiClient.LoginAsync(TokenType.Webhook, token).GetAwaiter().GetResult();
+            Webhook = WebhookClientHelper.GetWebhookAsync(this, _webhookId).GetAwaiter().GetResult();
         }
 
         private DiscordWebhookClient(DiscordRestConfig config)
@@ -136,5 +116,31 @@ namespace Discord.Webhook
         {
             ApiClient?.Dispose();
         }
+
+        internal static void ParseWebhookUrl(string webhookUrl, out ulong webhookId, out string webhookToken)
+        {
+            if (string.IsNullOrWhiteSpace(webhookUrl))
+                throw new ArgumentNullException(paramName: nameof(webhookUrl), message:
+                    "The given webhook Url cannot be null or whitespace.");
+
+            // thrown when groups are not populated/valid, or when there is no match
+            ArgumentException ex(string reason = null)
+                => new ArgumentException(paramName: nameof(webhookUrl), message:
+                $"The given webhook Url was not in a valid format. {reason}");
+            var match = WebhookUrlRegex.Match(webhookUrl);
+            if (match != null)
+            {
+                // ensure that the first group is a ulong, set the _webhookId
+                // 0th group is always the entire match, so start at index 1
+                if (!(match.Groups[1].Success && ulong.TryParse(match.Groups[1].Value, out webhookId)))
+                    throw ex("The webhook Id could not be parsed.");
+
+                if (!match.Groups[2].Success)
+                    throw ex("The webhook token could not be parsed.");
+                webhookToken = match.Groups[2].Value;
+            }
+            else
+                throw ex();
+        }
     }
 }

test/Discord.Net.Tests/Tests.DiscordWebhookClient.cs

@@ -7,32 +7,30 @@ using Xunit;
 namespace Discord
 {
     /// <summary>
-    ///     Tests that the <see cref=""/>
+    ///     Tests the <see cref="DiscordWebhookClient.ParseWebhookUrl(string, out ulong, out string)"/> function.
     /// </summary>
     public class DiscordWebhookClientTests
     {
         [Theory]
-        [InlineData("https://discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
+        [InlineData("https://discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK",
+            123412347732897802, "_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
         // ptb, canary, etc will have slightly different urls
-        [InlineData("https://ptb.discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
-        [InlineData("https://canary.discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
+        [InlineData("https://ptb.discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK",
+            123412347732897802, "_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
+        [InlineData("https://canary.discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK",
+            123412347732897802, "_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
         // don't care about https
-        [InlineData("http://canary.discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
+        [InlineData("http://canary.discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK",
+            123412347732897802, "_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
         // this is the minimum that the regex cares about
-        [InlineData("discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
-        public void TestWebhook_Valid(string webhookurl)
+        [InlineData("discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK",
+            123412347732897802, "_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
+        public void TestWebhook_Valid(string webhookurl, ulong expectedId, string expectedToken)
         {
-            try
-            {
-                _ = new DiscordWebhookClient(webhookurl);
-            }
-            catch (InvalidOperationException)
-            {
-                // ignore, thrown because webhook urls are invalid
-            }
-            
-            // pass if no exception thrown
-            Assert.True(true);
+            DiscordWebhookClient.ParseWebhookUrl(webhookurl, out ulong id, out string token);
+
+            Assert.Equal(expectedId, id);
+            Assert.Equal(expectedToken, token);
         }
 
         [Theory]
@@ -43,7 +41,7 @@ namespace Discord
         {
             Assert.Throws<ArgumentNullException>(() =>
             {
-                _ = new DiscordWebhookClient(webhookurl);
+                DiscordWebhookClient.ParseWebhookUrl(webhookurl, out ulong id, out string token);
             });
         }
 
@@ -55,7 +53,7 @@ namespace Discord
         {
             Assert.Throws<ArgumentException>(() =>
             {
-                _ = new DiscordWebhookClient(webhookurl);
+                DiscordWebhookClient.ParseWebhookUrl(webhookurl, out ulong id, out string token);
             });
         }
     }

test/Discord.Net.Tests/Tests.cs

@@ -50,4 +50,4 @@ namespace Discord
             _guild = fixture._guild;
         }
     }
-}
+}