WpfExtended/WpfExtended.Test/Logging/LoggerResolverTests.cs

using FluentAssertions;
using Microsoft.Extensions.Logging;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Moq;
using System;
using System.Windows.Extensions.Logging;
using WpfExtended.Logging;

namespace WpfExtended.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);
        }
    }
}