LightweightIocContainer/Test.LightweightIocContainer/IocContainerTest.cs

using JetBrains.Annotations;
using LightweightIocContainer;
using LightweightIocContainer.Exceptions;
using LightweightIocContainer.Interfaces;
using LightweightIocContainer.Interfaces.Installers;
using Moq;
using NUnit.Framework;

namespace Test.LightweightIocContainer
{
    [TestFixture]
    public class IocContainerTest
    {
        private interface ITest
        {

        }

        private interface IFoo
        {

        }

        private class Test : ITest
        {

        }

        [UsedImplicitly]
        private class TestConstructor : ITest
        {
            public TestConstructor(string name, Test test)
            {

            }

            public TestConstructor(Test test, string name = null)
            {

            }

            public TestConstructor(IFoo foo, string name)
            {

            }
        }

        [UsedImplicitly]
        private class TestPrivateConstructor : ITest
        {
            private TestPrivateConstructor()
            {

            }
        }

        [UsedImplicitly]
        private class TestMultipleConstructors : ITest
        {
            public TestMultipleConstructors(string name, bool success)
            {

            }

            public TestMultipleConstructors(string name)
            {

            }
        }

        [UsedImplicitly]
        private class Foo : IFoo
        {

        }

        private class MultitonScope
        {

        }


        private IocContainer _iocContainer;

        [SetUp]
        public void SetUp() => _iocContainer = new IocContainer();

        [TearDown]
        public void TearDown() => _iocContainer.Dispose();


        [Test]
        public void TestInstall()
        {
            Mock<IIocInstaller> installerMock = new();
            IIocContainer returnedContainer = _iocContainer.Install(installerMock.Object);

            installerMock.Verify(m => m.Install(It.IsAny<IIocContainer>()), Times.Once);

            Assert.AreEqual(_iocContainer, returnedContainer);
        }

        [Test]
        public void TestInstallMultiple()
        {
            Mock<IIocInstaller> installer1Mock = new();
            Mock<IIocInstaller> installer2Mock = new();
            Mock<IIocInstaller> installer3Mock = new();

            IIocContainer returnedContainer = _iocContainer.Install(installer1Mock.Object, installer2Mock.Object, installer3Mock.Object);

            installer1Mock.Verify(m => m.Install(It.IsAny<IIocContainer>()), Times.Once);
            installer2Mock.Verify(m => m.Install(It.IsAny<IIocContainer>()), Times.Once);
            installer3Mock.Verify(m => m.Install(It.IsAny<IIocContainer>()), Times.Once);

            Assert.AreEqual(_iocContainer, returnedContainer);
        }

        [Test]
        public void TestRegister() => Assert.DoesNotThrow(() => _iocContainer.Register<ITest, Test>());

        [Test]
        public void TestRegisterTypeWithoutInterface() => Assert.DoesNotThrow(() => _iocContainer.Register<Test>());

        [Test]
        public void TestRegisterMultiton() => Assert.DoesNotThrow(() => _iocContainer.RegisterMultiton<ITest, Test, MultitonScope>());

        [Test]
        public void TestInvalidMultitonRegistration() => Assert.Throws<InvalidRegistrationException>(() => _iocContainer.Register<ITest, Test>(Lifestyle.Multiton));

        [Test]
        public void TestRegisterMultiple()
        {
            _iocContainer.Register<ITest, Test>();
            MultipleRegistrationException exception = Assert.Throws<MultipleRegistrationException>(() => _iocContainer.Register<ITest, TestConstructor>());
            Assert.AreEqual(typeof(ITest), exception?.Type);
        }

        [Test]
        public void TestResolveNotRegistered()
        {
            TypeNotRegisteredException exception = Assert.Throws<TypeNotRegisteredException>(() => _iocContainer.Resolve<ITest>());
            Assert.AreEqual(typeof(ITest), exception?.Type);
        }

        [Test]
        public void TestResolve()
        {
            _iocContainer.Register<ITest, Test>();

            ITest resolvedTest = _iocContainer.Resolve<ITest>();

            Assert.IsInstanceOf<Test>(resolvedTest);
        }

        [Test]
        public void TestResolveWithoutInterface()
        {
            _iocContainer.Register<Test>();

            Test resolvedTest = _iocContainer.Resolve<Test>();

            Assert.IsInstanceOf<Test>(resolvedTest);
        }

        [Test]
        public void TestResolveInterfaceWithoutImplementation()
        {
            _iocContainer.Register<ITest>();
            Assert.Throws<InvalidRegistrationException>(() => _iocContainer.Resolve<ITest>());
        }
        
        [Test]
        public void TestResolveImplementationRegisteredWithInterface()
        {
            _iocContainer.Register<ITest, Test>();

            Test resolvedTest = _iocContainer.Resolve<Test>();
            
            Assert.IsInstanceOf<Test>(resolvedTest);
        }

        [Test]
        public void TestResolveWithParams()
        {
            _iocContainer.Register<ITest, TestConstructor>();

            ITest resolvedTest = _iocContainer.Resolve<ITest>("Test", new Test());

            Assert.IsInstanceOf<TestConstructor>(resolvedTest);
        }

        [Test]
        public void TestResolveWithMissingParam()
        {
            _iocContainer.Register<ITest, TestConstructor>();
            _iocContainer.Register<Test, Test>(); //this registration is abnormal and should only be used in unit tests

            ITest resolvedTest = _iocContainer.Resolve<ITest>("Test");

            Assert.IsInstanceOf<TestConstructor>(resolvedTest);
        }

        [Test]
        public void TestResolveSingleton()
        {
            _iocContainer.Register<ITest, Test>(Lifestyle.Singleton);

            ITest resolvedTest = _iocContainer.Resolve<ITest>();
            ITest secondResolvedTest = _iocContainer.Resolve<ITest>();

            Assert.AreEqual(resolvedTest, secondResolvedTest);
        }

        [Test]
        public void TestResolveMultiton()
        {
            _iocContainer.RegisterMultiton<ITest, Test, MultitonScope>();

            MultitonScope scope1 = new();
            MultitonScope scope2 = new();

            ITest resolvedTest1 = _iocContainer.Resolve<ITest>(scope1);
            ITest resolvedTest2 = _iocContainer.Resolve<ITest>(scope1);
            ITest resolvedTest3 = _iocContainer.Resolve<ITest>(scope2);

            Assert.AreSame(resolvedTest1, resolvedTest2);
            Assert.AreNotSame(resolvedTest1, resolvedTest3);
            Assert.AreNotSame(resolvedTest2, resolvedTest3);
        }

        [Test]
        public void TestResolveMultitonNoArgs()
        {
            _iocContainer.RegisterMultiton<ITest, Test, MultitonScope>();

            MultitonResolveException exception = Assert.Throws<MultitonResolveException>(() => _iocContainer.Resolve<ITest>());
            Assert.AreEqual(typeof(ITest), exception?.Type);
        }

        [Test]
        public void TestResolveMultitonWrongArgs()
        {
            _iocContainer.RegisterMultiton<ITest, Test, MultitonScope>();

            MultitonResolveException exception = Assert.Throws<MultitonResolveException>(() => _iocContainer.Resolve<ITest>(new object()));
            Assert.AreEqual(typeof(ITest), exception?.Type);
        }

        [Test]
        public void TestResolveTransient()
        {
            _iocContainer.Register<ITest, Test>();

            ITest resolvedTest = _iocContainer.Resolve<ITest>();
            ITest secondResolvedTest = _iocContainer.Resolve<ITest>();

            Assert.AreNotEqual(resolvedTest, secondResolvedTest);
        }

        [Test]
        public void TestResolveNoMatchingConstructor()
        {
            _iocContainer.Register<ITest, TestConstructor>();
            NoMatchingConstructorFoundException exception = Assert.Throws<NoMatchingConstructorFoundException>(() => _iocContainer.Resolve<ITest>());
            Assert.AreEqual(typeof(TestConstructor), exception?.Type);
        }

        [Test]
        public void TestResolveNoMatchingConstructorNotThrownWrongly()
        {
            _iocContainer.Register<ITest, TestMultipleConstructors>();
            Assert.DoesNotThrow(() => _iocContainer.Resolve<ITest>("Name"));
        }

        [Test]
        public void TestResolvePrivateConstructor()
        {
            _iocContainer.Register<ITest, TestPrivateConstructor>();
            NoPublicConstructorFoundException exception = Assert.Throws<NoPublicConstructorFoundException>(() => _iocContainer.Resolve<ITest>());
            Assert.AreEqual(typeof(TestPrivateConstructor), exception?.Type);
        }

        [Test]
        public void TestResolveSingleTypeRegistrationWithFactoryMethod()
        {
            _iocContainer.Register<IFoo, Foo>();
            _iocContainer.Register<ITest>().WithFactoryMethod(c => new TestConstructor(c.Resolve<IFoo>(), "someName"));

            ITest test = _iocContainer.Resolve<ITest>();
            
            Assert.NotNull(test);
        }

        [Test]
        public void TestIsTypeRegistered()
        {
            Assert.False(_iocContainer.IsTypeRegistered<ITest>());

            _iocContainer.Register<ITest, Test>();
            Assert.True(_iocContainer.IsTypeRegistered<ITest>());

            _iocContainer.Register<Test>();
            Assert.True(_iocContainer.IsTypeRegistered<Test>());
        }
    }
}