add some tests for the new DiscordWebhookClient constructor

test/Discord.Net.Tests/Discord.Net.Tests.csproj

@@ -19,6 +19,7 @@
     <ProjectReference Include="../../src/Discord.Net.Core/Discord.Net.Core.csproj" />
     <ProjectReference Include="../../src/Discord.Net.Rest/Discord.Net.Rest.csproj" />
     <ProjectReference Include="../../src/Discord.Net.Analyzers/Discord.Net.Analyzers.csproj" />
+    <ProjectReference Include="..\..\src\Discord.Net.Webhook\Discord.Net.Webhook.csproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Akavache" Version="6.0.31" />

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

@@ -0,0 +1,62 @@
+using Discord.Webhook;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+
+namespace Discord
+{
+    /// <summary>
+    ///     Tests that the <see cref=""/>
+    /// </summary>
+    public class DiscordWebhookClientTests
+    {
+        [Theory]
+        [InlineData("https://discordapp.com/api/webhooks/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")]
+        // don't care about https
+        [InlineData("http://canary.discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
+        // this is the minimum that the regex cares about
+        [InlineData("p.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
+        public void TestWebhook_Valid(string webhookurl)
+        {
+            try
+            {
+                _ = new DiscordWebhookClient(webhookurl);
+            }
+            catch (InvalidOperationException)
+            {
+                // ignore, thrown because webhook urls are invalid
+            }
+            
+            // pass if no exception thrown
+            Assert.True(true);
+        }
+
+        [Theory]
+        [InlineData("")]
+        [InlineData("   ")]
+        [InlineData(null)]
+        public void TestWebhook_Null(string webhookurl)
+        {
+            Assert.Throws<ArgumentNullException>(() =>
+            {
+                _ = new DiscordWebhookClient(webhookurl);
+            });
+        }
+
+        [Theory]
+        [InlineData("123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK")]
+        // trailing slash
+        [InlineData("https://discordapp.com/api/webhooks/123412347732897802/_abcde123456789-ABCDEFGHIJKLMNOP12345678-abcdefghijklmnopABCDEFGHIJK/")]
+        public void TestWebhook_Invalid(string webhookurl)
+        {
+            Assert.Throws<ArgumentException>(() =>
+            {
+                _ = new DiscordWebhookClient(webhookurl);
+            });
+        }
+    }
+}