Disable place_order without Enova credentials

tests/SmartB2B.Enova.Tests/Program.cs

@@ -25,7 +25,9 @@ var tests = new (string Name, Func<Task> Run)[]
     ("Brak waluty zwraca stabilny błąd", MissingCurrency),
     ("Waluta inna niż PLN jest odrzucana", UnsupportedCurrency),
     ("Brak katalogu Enovy jest wykrywany", MissingEnovaDirectory),
-    ("Sekrety są odczytywane z pliku konfiguracji", SecretsComeFromConfigurationFile)
+    ("Sekrety są odczytywane z pliku konfiguracji", SecretsComeFromConfigurationFile),
+    ("Brak danych operatora wyłącza place_order", MissingCredentialsDisablePlaceOrder),
+    ("Częściowe dane operatora wyłączają place_order", PartialCredentialsDisablePlaceOrder)
 };
 
 var failures = 0;
@@ -214,7 +216,10 @@ static Task SecretsComeFromConfigurationFile()
 
         var runtime = ServiceSettings.Load(path).ResolveRuntimeSettings();
 
-        AssertEqual("haslo-z-pliku", runtime.EnovaConfiguration.Connection.Password, "hasło operatora");
+        AssertEqual(
+            "haslo-z-pliku",
+            runtime.EnovaConfiguration?.Connection.Password,
+            "hasło operatora");
         AssertEqual(
             "Server=db;Database=enova;User ID=user;Password=sql-z-pliku",
             runtime.SqlConnectionString,
@@ -227,6 +232,47 @@ static Task SecretsComeFromConfigurationFile()
     }
 }
 
+static Task MissingCredentialsDisablePlaceOrder()
+{
+    var runtime = LoadRuntimeSettings(string.Empty);
+    AssertEqual(null, runtime.EnovaConfiguration, "konfiguracja endpointu place_order");
+    return Task.CompletedTask;
+}
+
+static Task PartialCredentialsDisablePlaceOrder()
+{
+    var runtime = LoadRuntimeSettings("\"operator\": \"Administrator\",");
+    AssertEqual(null, runtime.EnovaConfiguration, "konfiguracja endpointu place_order");
+    return Task.CompletedTask;
+}
+
+static RuntimeSettings LoadRuntimeSettings(string credentialsJson)
+{
+    var path = Path.Combine(Path.GetTempPath(), $"enova-settings-{Guid.NewGuid():N}.json");
+    try
+    {
+        File.WriteAllText(path, $$"""
+            {
+              "portal": "demo",
+              "wamp": { "serverUrl": "ws://localhost:8080/" },
+              "enova": {
+                "installationPath": "C:/Enova",
+                "database": "Firma demo",
+                {{credentialsJson}}
+                "documentDefinition": "ZO"
+              },
+              "sql": { "connectionString": "Server=db;Database=enova;User ID=user;Password=secret" }
+            }
+            """);
+
+        return ServiceSettings.Load(path).ResolveRuntimeSettings();
+    }
+    finally
+    {
+        File.Delete(path);
+    }
+}
+
 static RpcInvocation CreateInvocation() => new(
     [],
     new Dictionary<string, object?>