add unit test for making sure all translations keys exist

Tests/Lib/Localization/Translations.test.cs

@@ -0,0 +1,44 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using FluentAssertions;
+using Xunit;
+using YamlDotNet.Serialization;
+
+namespace Tests.Lib.Localization
+{
+    public class Translations_test
+    {
+        [Fact]
+        public void TranslationsYamlIsValid()
+        {
+            // Read the file
+            var translationFile = File.ReadAllText(Path.GetFullPath("./../../../../Geekbot.net/Lib/Localization/Translations.yml"));
+                
+            // Deserialize
+            var input = new StringReader(translationFile);
+            var deserializer = new DeserializerBuilder().Build();
+            var rawTranslations = deserializer.Deserialize<Dictionary<string, Dictionary<string, Dictionary<string, string>>>>(input);
+            
+            // These languages must be supported
+            var supportedLanguages = new List<string>
+            {
+                "EN",
+                "CHDE"
+            };
+            
+            // Iterate every single key to make sure it's populated
+            foreach (var command in rawTranslations)
+            {
+                foreach (var str in command.Value)
+                {
+                    str.Value.Select(e => e.Key).ToList().Should().BeEquivalentTo(supportedLanguages, str.Key);
+                    foreach (var lang in str.Value)
+                    {
+                        lang.Value.Should().NotBeNullOrEmpty($"{command.Key} / {str.Key} / {lang.Key}");
+                    }
+                }
+            }
+        }
+    }
+}

Tests/Tests.csproj

@@ -6,11 +6,13 @@
     <NoWarn>xUnit1026</NoWarn>
   </PropertyGroup>
   <ItemGroup>
+    <PackageReference Include="FluentAssertions" Version="5.6.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.0" />
     <PackageReference Include="Moq" Version="4.10.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
     <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.1" />
+    <PackageReference Include="YamlDotNet" Version="6.0.0" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Geekbot.net\Geekbot.net.csproj" />