System.NullReferenceException inside TechTalk.SpecFlow about specflow.dependencyinjection

[304NotModified]

I found the issue (I have checked out the repo)

If the dependency isn't found, you will get this nasty exception.

So:

namespace SolidToken.SpecFlow.DependencyInjection.Tests
{
    public static class TestDependencies
    {
        [ScenarioDependencies]
        public static IServiceCollection CreateServices()
        {
            var services = new ServiceCollection();

            //// Add test dependencies
            //services.AddTransient<ITestService, TestService>();

            //// ContextInjectionScope (by using AddScoped instead of AddTransient, the context will be scoped to the Feature across bindings)
            //services.AddScoped<TestContext>();

            //// NOTE: This line is essential so that Microsoft.Extensions.DependencyInjection knows
            //// about the SpecFlow bindings (something normally BoDi does automatically).
            //// TODO: Find out if we can make this part of the Plugin
            //foreach (var type in typeof(TestDependencies).Assembly.GetTypes().Where(t => Attribute.IsDefined(t, typeof(BindingAttribute))))
            //{
            //    services.AddSingleton(type);
            //}

            return services;
        }
    }
}

Will demo the issue

[mbhoek]

Let me investigate and I will get back to you.

[304NotModified]

FYI:

 <TargetFramework>netcoreapp2.1</TargetFramework>

tried also static class, but that won't help either.

The big difference is here (I think), that we're using MSTest and not xUnit

[mbhoek]

Is it possible that you have not registered any bindings (yet)?

For example, if you look at DependencyInjectionPluginSteps.cs you will notice the [Binding] tag that will bind the code to the SpecFlow Feature file.

Currently the plugin requires you to register all the bindings/step definitions (otherwise the DI framework can't find them). So your initialisation code should look like:

  var services = new ServiceCollection();

  foreach (var type in typeof(TestDependencies).Assembly.GetTypes().Where(t => Attribute.IsDefined(t, typeof(BindingAttribute))))
  {
      services.AddSingleton(type);
  }

  return services;

Although this is in the README.md, I don't think it is very intuitive and I want to solve it as part of issue #7 but haven't landed on a solution yet.

[304NotModified]

ow yes indeed. I missed that! That's the fix.

Would be great if we could make that optional.

[304NotModified]

@mbhoek check #25 :)

This could be closed.