Add some tests to ensure exceptions are thrown on string splitter with null/empty message or maxchunksize <1

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

Author: PromoFaux

ManualTests/ManualTests.csproj

@@ -9,4 +9,10 @@
     <ProjectReference Include="..\Matterhook.NET.MatterhookClient\Matterhook.NET.MatterhookClient.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="config.json">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>

Matterhook.NET.MatterhookClient.Tests/MiscTests.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using Xunit;
+
+namespace Matterhook.NET.MatterhookClient.Tests
+{
+    public class MiscTests
+    {
+
+        [Fact]
+        public void StringSplitterThrowsExceptionWhenNullStringPassed()
+        {
+            Assert.Throws<ArgumentException>(() => StringSplitter.SplitTextIntoChunks(null, 250, false));
+        }
+
+        [Fact]
+        public void StringSplitterThrowsExceptionWhenChunkSizeOfLessThan1()
+        {
+            Assert.Throws<ArgumentException>(() => StringSplitter.SplitTextIntoChunks("A message", 0, false));
+        }
+
+    }
+}

Matterhook.NET.MatterhookClient/MatterhookClient.cs

@@ -108,7 +108,7 @@ public async Task<HttpResponseMessage> PostAsync(MattermostMessage inMessage, in
 
                 foreach (var msg in outMessages)
                 {
-                    var msgJson = msg.SerializeToJson(); 
+                    var msgJson = msg.SerializeToJson();
                     response = await _httpClient.PostAsync(_webhookUrl,
                         new StringContent(msgJson, Encoding.UTF8, "application/json")).ConfigureAwait(false);
                 }

Matterhook.NET.MatterhookClient/MattermostMessage.cs

@@ -51,7 +51,6 @@ internal MattermostMessage Clone()
             };
         }
 
-
         public string SerializeToJson()
         {
             return JsonConvert.SerializeObject(this, new MattermostJsonSerializerSettings());