Add tests

Yubico.Core/tests/Yubico/Core/Logging/LogTests.cs

@@ -0,0 +1,68 @@
+// Copyright 2024 Yubico AB
+// 
+// Licensed under the Apache License, Version 2.0 (the "License").
+// You may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// 
+//     http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+using Microsoft.Extensions.Logging;
+using Moq;
+using Xunit;
+
+namespace Yubico.Core.Logging
+{
+    public class LogTests
+    {
+        // Ensure that the default LoggerFactory is created when no configuration is provided.
+        [Fact]
+        public void DefaultLoggerFactory_IsCreated_WhenNoConfigurationProvided()
+        {
+            // Act
+            ILoggerFactory loggerFactory = Log.Instance;
+
+            // Assert
+            Assert.NotNull(loggerFactory);
+            ILogger logger = loggerFactory.CreateLogger<LogTests>();
+            Assert.NotNull(logger);
+        }
+
+        // Ensure that LoggerFactory can be replaced manually using the Instance property.
+        [Fact]
+        public void ManualLoggerFactory_SettingInstance_OverridesDefaultFactory()
+        {
+            // Arrange
+            var mockLoggerFactory = new Mock<ILoggerFactory>();
+            Log.Instance = mockLoggerFactory.Object;
+
+            // Act
+            ILoggerFactory actualFactory = Log.Instance;
+
+            // Assert
+            Assert.Same(mockLoggerFactory.Object, actualFactory);
+        }
+
+        // Ensure that LoggerFactory can be replaced manually using the Instance property.
+        // Remove this once we remove Log.Legacy.cs
+        [Fact]
+        public void Legacy_ManualLoggerFactory_SettingInstance_OverridesDefaultFactory()
+        {
+            // Arrange
+            var mockLoggerFactory = new Mock<ILoggerFactory>();
+#pragma warning disable CS0618 // Type or member is obsolete
+            Log.LoggerFactory = mockLoggerFactory.Object;
+#pragma warning restore CS0618 // Type or member is obsolete
+
+            // Act
+            ILoggerFactory actualFactory = Log.Instance;
+
+            // Assert
+            Assert.Same(mockLoggerFactory.Object, actualFactory);
+        }
+    }
+}