Dependency Injection extensions

SystemExtensions.DependencyInjection.Tests/Logging/CVLoggerProviderTests.cs

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+using FluentAssertions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Moq;
+using System.Logging;
+
+namespace SystemExtensions.DependencyInjection.Tests.Logging
+{
+    [TestClass]
+    public class CVLoggerProviderTests
+    {
+        private readonly Mock<ILogsWriter> logsWriterMock = new();
+        private CVLoggerProvider cVLoggerProvider;
+
+        [TestInitialize]
+        public void TestInitialize()
+        {
+            this.cVLoggerProvider = new CVLoggerProvider(this.logsWriterMock.Object);
+        }
+
+        [TestMethod]
+        public void CreateLogger_CreatesNewLogger()
+        {
+            var logger = this.cVLoggerProvider.CreateLogger(string.Empty);
+
+            logger.Should().NotBeNull();
+        }
+
+        [TestMethod]
+        public void LogEntry_CallsLogWriter()
+        {
+            this.cVLoggerProvider.LogEntry(new Log());
+
+            this.logsWriterMock.Verify();
+        }
+
+        private void SetupLogsWriter()
+        {
+            this.logsWriterMock
+                .Setup(u => u.WriteLog(It.IsAny<Log>()))
+                .Verifiable();
+        }
+    }
+}

SystemExtensions.DependencyInjection.Tests/Logging/CVLoggerTests.cs

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+using FluentAssertions;
+using Microsoft.Extensions.Logging;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Moq;
+using System;
+using System.Logging;
+
+namespace SystemExtensions.DependencyInjection.Tests.Logging
+{
+    [TestClass]
+    public class CVLoggerTests
+    {
+        private readonly Mock<ICVLoggerProvider> cvLoggerProviderMock = new();
+        private CVLogger cVLogger;
+
+        [TestInitialize]
+        public void TestInitialize()
+        {
+            this.cVLogger = new CVLogger(string.Empty, this.cvLoggerProviderMock.Object);
+        }
+
+        [TestMethod]
+        public void BeginScope_ReturnsNull()
+        {
+            var scope = this.cVLogger.BeginScope(string.Empty);
+
+            scope.Should().BeNull();
+        }
+
+        [TestMethod]
+        [DataRow(LogLevel.Debug)]
+        [DataRow(LogLevel.Trace)]
+        [DataRow(LogLevel.Information)]
+        [DataRow(LogLevel.Warning)]
+        [DataRow(LogLevel.Error)]
+        [DataRow(LogLevel.Critical)]
+        public void IsEnabled_OnAllLogLevels_ReturnsTrue(LogLevel logLevel)
+        {
+            var enabled = this.cVLogger.IsEnabled(logLevel);
+
+            enabled.Should().BeTrue();
+        }
+
+        [TestMethod]
+        public void Log_CallsFormatter()
+        {
+            var called = false;
+            Func<string, Exception, string> messageFormatter = new((state, exception) =>
+            {
+                called = true;
+                return string.Empty;
+            });
+
+            this.cVLogger.Log(LogLevel.Debug, new EventId(), "Some message", new Exception(), messageFormatter);
+
+            called.Should().BeTrue();
+        }
+
+        [TestMethod]
+        public void Log_CallsLogsProvider()
+        {
+            this.SetupLoggerProvider();
+
+            this.cVLogger.Log(LogLevel.Debug, new EventId(), "Some message", new Exception(), new Func<string, Exception, string>((s, e) => string.Empty));
+
+            this.cvLoggerProviderMock.Verify();
+        }
+
+        private void SetupLoggerProvider()
+        {
+            this.cvLoggerProviderMock
+                .Setup(u => u.LogEntry(It.IsAny<Log>()))
+                .Verifiable();
+        }
+    }
+}

SystemExtensions.DependencyInjection.Tests/Logging/DebugLogsWriterTests.cs

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+using FluentAssertions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System;
+using System.Logging;
+
+namespace SystemExtensions.DependencyInjection.Tests.Logging
+{
+    [TestClass]
+    public class DebugLogsWriterTests
+    {
+        private readonly DebugLogsWriter logsWriter = new();
+
+        [TestMethod]
+        public void WriteLog_Succeeds()
+        {
+            this.logsWriter.WriteLog(new Log());
+        }
+
+        [TestMethod]
+        public void WriteNullLog_Throws()
+        {
+            Action action = new(() =>
+            {
+                this.logsWriter.WriteLog(null);
+            });
+
+            action.Should().Throw<Exception>();
+        }
+    }
+}

SystemExtensions.DependencyInjection.Tests/Logging/LoggerResolverTests.cs

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+using FluentAssertions;
+using Microsoft.Extensions.Logging;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Moq;
+using System;
+using System.Logging;
+using System.Windows.Extensions.Logging;
+
+namespace SystemExtensions.DependencyInjection.Tests.Logging
+{
+    [TestClass]
+    public class LoggerResolverTests
+    {
+        private readonly Mock<Slim.IServiceProvider> serviceProviderMock = new();
+        private readonly Mock<ILoggerFactory> loggerFactoryMock = new();
+        private readonly Mock<ILogger> loggerMock = new();
+        private readonly LoggerResolver loggerResolver = new();
+
+        [TestMethod]
+        public void CanResolve_ILogger_ReturnsTrue()
+        {
+            var type = typeof(ILogger);
+
+            var canResolve = this.loggerResolver.CanResolve(type);
+
+            canResolve.Should().BeTrue();
+        }
+
+        [TestMethod]
+        public void CanResolve_GenericILogger_ReturnsTrue()
+        {
+            var type = typeof(ILogger<string>);
+
+            var canResolve = this.loggerResolver.CanResolve(type);
+
+            canResolve.Should().BeTrue();
+        }
+
+        [TestMethod]
+        public void CanResolve_AnythingElse_ReturnsFalse()
+        {
+            var types = new Type[] { typeof(CVLogger), typeof(object), typeof(string), typeof(LoggerResolverTests), typeof(int) };
+
+            foreach(var type in types)
+            {
+                var canResolve = this.loggerResolver.CanResolve(type);
+
+                canResolve.Should().BeFalse();
+            }   
+        }
+
+        [TestMethod]
+        public void Resolve_ILogger_ReturnsILogger()
+        {
+            this.SetupIServiceProvider();
+
+            var logger = this.loggerResolver.Resolve(this.serviceProviderMock.Object, typeof(ILogger));
+
+            logger.Should().BeAssignableTo<ILogger>();
+        }
+
+        [TestMethod]
+        public void Resolve_TypedILogger_ReturnsTypedILogger()
+        {
+            this.SetupIServiceProvider();
+
+            var logger = this.loggerResolver.Resolve(this.serviceProviderMock.Object, typeof(ILogger<string>));
+
+            logger.Should().BeAssignableTo<ILogger<string>>();
+        }
+
+        [TestMethod]
+        public void Resolve_RandomType_Throws()
+        {
+            this.SetupIServiceProvider();
+
+            Action action = new(() =>
+            {
+                this.loggerResolver.Resolve(this.serviceProviderMock.Object, typeof(string));
+            });
+
+            action.Should().Throw<Exception>();
+        }
+
+        [TestMethod]
+        public void Resolve_NonTypedGeneric_Throws()
+        {
+            this.SetupIServiceProvider();
+
+            Action action = new(() =>
+            {
+                this.loggerResolver.Resolve(this.serviceProviderMock.Object, typeof(ILogger<>));
+            });
+
+            action.Should().Throw<Exception>();
+        }
+
+        private void SetupIServiceProvider()
+        {
+            this.serviceProviderMock
+                .Setup(u => u.GetService<ILoggerFactory>())
+                .Returns(this.loggerFactoryMock.Object);
+
+            this.loggerFactoryMock
+                .Setup(u => u.CreateLogger(It.IsAny<string>()))
+                .Returns(this.loggerMock.Object);
+        }
+    }
+}