Dynamic context injection in Specflow

Question

Using Specflow's basic dependency injection, it is possible to inject a dynamic context object as below.

This saves having to use the dictionary which I find clunky, are there drawbacks to this approach?

public class TestClass
{
    private readonly dynamic context;

    public TestClass(ExpandoObject context)
    {
        this.context = context;
    }

    [Given(@"I have a file")]
    public void GivenIHaveAFile()
    {
        context.FilePath = @".\Folder\File";
    }

    [When(@"I use the file")]
    public void GivenIHaveAFile()
    {
        var fileContents = File.ReadAllText(context.FilePath);
    }
}

Sam Holder · Accepted Answer · 2014-12-18 16:42:43Z

3

The drawbacks are only those that you get with using dynamic objects in general. You'll get no intellisense and won't be able to add any behaviour to your object.

Personally I prefer to use specific classes to handle passing state between steps as these objects can then be assigned behaviour as well as holding data, but YMMV.

In place of the generic dictionary though this seems reasonable, as it at least avoids the casting.

answered Dec 18, 2014 at 16:42

Sam Holder

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