inject_to_scope.cs

using System;
using Shouldly;
using StructureMap.Testing.Widget;
using Xunit;

namespace Lamar.Testing.IoC.Acceptance;

public class inject_to_scope
{
    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    public void inject_into_root_container(bool replace)
    {
        var container = new Container(_ => { _.Injectable<IWidget>(); });

        var widget = new AWidget();
        container.Inject(typeof(IWidget), widget, replace);

        container.GetInstance<IWidget>()
            .ShouldBeSameAs(widget);

        container.GetInstance<WidgetUser>()
            .Widget.ShouldBeSameAs(widget);
    }

    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    public void inject_scoping_with_nested_container(bool replace)
    {
        var container = new Container(_ => { _.Injectable<IWidget>(); });

        var rootWidget = new AWidget();
        container.Inject(typeof(IWidget), rootWidget, replace);

        var nestedWidget = new BWidget();

        var nested = container.GetNestedContainer();
        nested.Inject<IWidget>(nestedWidget);

        container.GetInstance<IWidget>()
            .ShouldBeSameAs(rootWidget);

        nested.GetInstance<IWidget>()
            .ShouldBeSameAs(nestedWidget);
    }

    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    public void requires_assignable_type(bool replace)
    {
        var container = new Container(_ => { _.Injectable<IWidget>(); });

        Assert.Throws<InvalidOperationException>(() => container.Inject(typeof(IWidget), new object(), replace));
    }

    [Fact]
    public void replace_causes_replacement_of_previous_value_on_subsequent_call()
    {
        var container = new Container(_ => { _.Injectable<IWidget>(); });

        var replaced = new AWidget();
        var widget = new AWidget();
        container.Inject(typeof(IWidget), replaced, false);
        container.Inject(typeof(IWidget), widget, true);

        container.GetInstance<IWidget>()
            .ShouldBeSameAs(widget);

        container.GetInstance<WidgetUser>()
            .Widget.ShouldBeSameAs(widget);
    }

    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    public void generic_calls_nongeneric(bool replace)
    {
        var container = new Derived(_ => { _.Injectable<IWidget>(); });

        var widget = new AWidget();
        container.Inject<IWidget>(widget, replace);

        container.serviceType.ShouldBeSameAs(typeof(IWidget));
        container.@object.ShouldBeSameAs(widget);
        container.replace.ShouldBe(replace);

        container.GetInstance<IWidget>()
            .ShouldBeSameAs(widget);

        container.GetInstance<WidgetUser>()
            .Widget.ShouldBeSameAs(widget);
    }

    [Fact]
    public void generic_calls_nongeneric_without_replace()
    {
        var container = new Derived(_ => { _.Injectable<IWidget>(); });

        var widget = new AWidget();
        container.Inject<IWidget>(widget);

        container.serviceType.ShouldBeSameAs(typeof(IWidget));
        container.@object.ShouldBeSameAs(widget);
        container.replace.ShouldBeFalse();

        container.GetInstance<IWidget>()
            .ShouldBeSameAs(widget);

        container.GetInstance<WidgetUser>()
            .Widget.ShouldBeSameAs(widget);
    }

    [Fact]
    public void using_injected_service()
    {
        #region sample_container-with-injectable

        var container = new Container(_ => { _.Injectable<ExecutionContext>(); });

        #endregion

        #region sample_injecting-context-to-nested

        var context = new ExecutionContext();

        var nested = container.GetNestedContainer();
        nested.Inject(context);

        #endregion


        #region sample_resolving-using-context

        var service = nested.GetInstance<ContextUsingService>();
        service.Context.ShouldBeSameAs(context);

        #endregion
    }

    private class Derived : Container
    {
        public object @object;
        public bool replace;

        public Type serviceType;

        public Derived(Action<ServiceRegistry> configuration) : base(configuration)
        {
        }

        public override void Inject(Type serviceType, object @object, bool replace)
        {
            this.serviceType = serviceType;
            this.@object = @object;
            this.replace = replace;
            base.Inject(serviceType, @object, replace);
        }
    }
}

#region sample_ContextUsingService

public class ContextUsingService
{
    public ContextUsingService(ExecutionContext context)
    {
        Context = context;
    }

    public ExecutionContext Context { get; }
}

#endregion

#region sample_ExecutionContext

// This class is specific to some kind of short lived 
// process and lives in a nested container
public class ExecutionContext
{
    public Guid Id { get; set; } = Guid.NewGuid();
}

#endregion