finished unit tests and docstrings

MalwareMultiScan.Api/Services/Implementations/ScanBackendService.cs

@@ -13,11 +13,19 @@ using YamlDotNet.Serialization.NamingConventions;
 
 namespace MalwareMultiScan.Api.Services.Implementations
 {
+    /// <inheritdoc />
     public class ScanBackendService : IScanBackendService
     {
         private readonly IBus _bus;
         private readonly ILogger<ScanBackendService> _logger;
 
+        /// <summary>
+        /// Initialise scan backend service.
+        /// </summary>
+        /// <param name="configuration">Configuration.</param>
+        /// <param name="bus">EasyNetQ bus.</param>
+        /// <param name="logger">Logger.</param>
+        /// <exception cref="FileNotFoundException">Missing backends.yaml configuration.</exception>
         public ScanBackendService(IConfiguration configuration, IBus bus, ILogger<ScanBackendService> logger)
         {
             _bus = bus;
@@ -36,9 +44,11 @@ namespace MalwareMultiScan.Api.Services.Implementations
 
             List = deserializer.Deserialize<ScanBackend[]>(configurationContent);
         }
-        
+
+        /// <inheritdoc />
         public ScanBackend[] List { get; }
-        
+
+        /// <inheritdoc />
         public async Task QueueUrlScan(ScanResult result, ScanBackend backend, string fileUrl)
         {
             _logger.LogInformation(