Use config key names in API Center validation errors

DevProxy.Integration.Tests/ApiCenterClientTests.cs

@@ -0,0 +1,33 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using DevProxy.Plugins.ApiCenter;
+using Microsoft.Extensions.Logging.Abstractions;
+using Xunit;
+
+namespace DevProxy.Integration.Tests;
+
+public sealed class ApiCenterClientTests
+{
+    [Theory]
+    [InlineData("subscriptionId")]
+    [InlineData("resourceGroupName")]
+    [InlineData("serviceName")]
+    [InlineData("workspaceName")]
+    public void Constructor_MissingSetting_ErrorUsesConfigKeyName(string missingKey)
+    {
+        var configuration = new ApiCenterClientConfiguration
+        {
+            SubscriptionId = missingKey == "subscriptionId" ? "" : "sub",
+            ResourceGroupName = missingKey == "resourceGroupName" ? "" : "rg",
+            ServiceName = missingKey == "serviceName" ? "" : "svc",
+            WorkspaceName = missingKey == "workspaceName" ? "" : "default"
+        };
+
+        var ex = Assert.Throws<ArgumentException>(() =>
+            new ApiCenterClient(configuration, NullLogger<ApiCenterClient>.Instance));
+
+        Assert.Equal($"Specify {missingKey} in the configuration.", ex.Message);
+    }
+}

DevProxy.Plugins/ApiCenter/ApiCenterClient.cs

@@ -40,19 +40,19 @@ internal ApiCenterClient(ApiCenterClientConfiguration configuration, ILogger<Api
     {
         if (string.IsNullOrEmpty(configuration.SubscriptionId))
         {
-            throw new ArgumentException($"Specify {nameof(ApiCenterClientConfiguration.SubscriptionId)} in the configuration.");
+            throw new ArgumentException("Specify subscriptionId in the configuration.");
         }
         if (string.IsNullOrEmpty(configuration.ResourceGroupName))
         {
-            throw new ArgumentException($"Specify {nameof(ApiCenterClientConfiguration.ResourceGroupName)} in the configuration.");
+            throw new ArgumentException("Specify resourceGroupName in the configuration.");
         }
         if (string.IsNullOrEmpty(configuration.ServiceName))
         {
-            throw new ArgumentException($"Specify {nameof(ApiCenterClientConfiguration.ServiceName)} in the configuration.");
+            throw new ArgumentException("Specify serviceName in the configuration.");
         }
         if (string.IsNullOrEmpty(configuration.WorkspaceName))
         {
-            throw new ArgumentException($"Specify {nameof(ApiCenterClientConfiguration.WorkspaceName)} in the configuration.");
+            throw new ArgumentException("Specify workspaceName in the configuration.");
         }
 
         // load configuration from env vars