Add first set of tests

.vscode/settings.json

@@ -1,5 +1,6 @@
 {
   "azureFunctions.projectRuntime": "beta",
   "azureFunctions.projectLanguage": "JavaScript",
-  "azureFunctions.templateFilter": "Verified"
+  "azureFunctions.templateFilter": "Verified",
+  "dotnet-test-explorer.testProjectPath": "test/SignalRServiceExtension.Tests"
 }

src/SignalRServiceExtension/AzureSignalR.cs

@@ -1,10 +1,12 @@
 using System;
 using System.IdentityModel.Tokens.Jwt;
+using System.Runtime.CompilerServices;
 using System.Security.Claims;
 using System.Text;
 using System.Text.RegularExpressions;
 using Microsoft.IdentityModel.Tokens;
 
+[assembly:InternalsVisibleTo("SignalRServiceExtension.Tests")]
 namespace Microsoft.Azure.WebJobs.Extensions.SignalRService
 {
     internal class AzureSignalR

test/SignalRServiceExtension.Tests/SignalRServiceExtension.Tests.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.8.0" />
+    <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="5.2.4" />
+    <PackageReference Include="xunit" Version="2.4.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\SignalRServiceExtension\Microsoft.Azure.WebJobs.Extensions.SignalRService.csproj" />
+  </ItemGroup>
+
+</Project>

test/SignalRServiceExtension.Tests/UnitTests.cs

@@ -0,0 +1,69 @@
+using System;
+using System.IdentityModel.Tokens.Jwt;
+using System.Text;
+using Microsoft.Azure.WebJobs.Extensions.SignalRService;
+using Microsoft.IdentityModel.Tokens;
+using Xunit;
+
+namespace SignalRServiceExtension.Tests
+{
+    public class UnitTests
+    {
+        [Fact]
+        public void AzureSignalR_ParsesConnectionString()
+        {
+            var azureSignalR = new AzureSignalR("Endpoint=https://foo.service.signalr.net;AccessKey=/abcdefghijklmnopqrstu/v/wxyz11111111111111=;");
+            Assert.Equal("https://foo.service.signalr.net", azureSignalR.BaseEndpoint);
+            Assert.Equal("/abcdefghijklmnopqrstu/v/wxyz11111111111111=", azureSignalR.AccessKey);
+        }
+
+        [Fact]
+        public void AzureSignalR_GetClientConnectionInfo_ReturnsValidInfo()
+        {
+            var azureSignalR = new AzureSignalR("Endpoint=https://foo.service.signalr.net;AccessKey=/abcdefghijklmnopqrstu/v/wxyz11111111111111=;");
+
+            var info = azureSignalR.GetClientConnectionInfo("chat");
+
+            const string expectedEndpoint = "https://foo.service.signalr.net:5001/client/?hub=chat";
+            EnsureValidAccessKey(
+                audience: expectedEndpoint,
+                signingKey: "/abcdefghijklmnopqrstu/v/wxyz11111111111111=", 
+                accessKey: info.AccessKey);
+            Assert.Equal(expectedEndpoint, info.Endpoint);
+        }
+
+        [Fact]
+        public void AzureSignalR_GetServerConnectionInfo_ReturnsValidInfo()
+        {
+            var azureSignalR = new AzureSignalR("Endpoint=https://foo.service.signalr.net;AccessKey=/abcdefghijklmnopqrstu/v/wxyz11111111111111=;");
+
+            var info = azureSignalR.GetServerConnectionInfo("chat");
+
+            const string expectedEndpoint = "https://foo.service.signalr.net:5002/api/v1-preview/hub/chat";
+            EnsureValidAccessKey(
+                audience: expectedEndpoint,
+                signingKey: "/abcdefghijklmnopqrstu/v/wxyz11111111111111=", 
+                accessKey: info.AccessKey);
+            Assert.Equal(expectedEndpoint, info.Endpoint);
+        }
+
+        private void EnsureValidAccessKey(string audience, string signingKey, string accessKey)
+        {
+            var validationParameters =
+                new TokenValidationParameters
+                {
+                    ValidAudiences = new[] { audience },
+                    ValidateAudience = true,
+                    ValidateIssuer = false,
+                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(signingKey)),
+                    RequireSignedTokens = true,
+                    RequireExpirationTime = true,
+                    ValidateLifetime = true,
+                    LifetimeValidator = (_, expires, __, ___) => 
+                        expires.HasValue && expires > DateTime.Now.AddMinutes(5) // at least 5 minutes
+                };
+            var handler = new JwtSecurityTokenHandler();
+            handler.ValidateToken(accessKey, validationParameters, out _);
+        }
+    }
+}