Added unit test class BackblazeClientTests.cs to Backblaze.Tests.Unit.csproj with tests that passing null for the ILoggerFactory parameter does not cause a crash.

Added a reference to NSubstitute to Backblaze.Tests.Unit.csproj.

Author: logiclrd

test/Unit/Backblaze.Tests.Unit.csproj

@@ -26,6 +26,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="NSubstitute" Version="5.1.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <PrivateAssets>all</PrivateAssets>

test/Unit/BackblazeClientTests.cs

@@ -0,0 +1,41 @@
+using System.Net.Http;
+
+using Bytewizer.Backblaze.Client;
+
+using Microsoft.Extensions.Caching.Memory;
+
+using Xunit;
+
+using NSubstitute;
+
+namespace Backblaze.Tests.Unit
+{
+	public class BackblazeClientTests
+	{
+		[Fact]
+		public void BackblazeClient_constructor_does_not_crash_on_null_loggerFactory()
+		{
+			// Arrange
+			var clientOptions = new ClientOptions();
+
+			var dummyMemoryCache = Substitute.For<IMemoryCache>();
+
+			// Act & Assert
+      new BackblazeClient(clientOptions, logger: null, dummyMemoryCache);
+		}
+
+		[Fact]
+		public void BackblazeClient_constructor_with_HttpClient_does_not_crash_on_null_loggerFactory()
+		{
+			// Arrange
+			var clientOptions = new ClientOptions();
+
+			var httpClient = new HttpClient();
+
+			var dummyMemoryCache = Substitute.For<IMemoryCache>();
+
+			// Act & Assert
+      new BackblazeClient(httpClient, clientOptions, logger: null, dummyMemoryCache);
+		}
+	}
+}