Add Assert Template compile correctly for unit testing

[Bchir]

Add Assert Template compile correctly for unit testing

[Romanx]

Hi there,

Would you mind explaining what use case you could see for this that we could help with?

We already throw exceptions when parsing and rendering that you can use for such tracking so you could easily write an extension for your preferred asserting framework.

[Bchir]

Hi, Yes sure, here is what am expecting the assert function should do : the assert function will need the template and the class that we would pass as view

• Assert that the template doesn't have any syntax error like not Unclosed Block
• Assert that there is no unknown property used like for example my class is a user class and it has username and email , but in the template i used phoneNumber, so it should fail the test for unknown property ( you can achieve this by using reflection on passed class )
• I don't know all the features for this framework but if there is a method to add formatter or something it should validate that the formatter exists

it doesn't have to be used throw asserting framework for exmeple automapper framework has it's own assert method Mapper.Configuration.AssertConfigurationIsValid(); so it would be something similar to this like StubbleVisitorRenderer.AssertRenderAsync<TSource>(string template,TSource view)

[Romanx]

Hey there,

I've thought about this request and think it's probably best to live separately from the core library. If you'd be interested in creating an asserting project I can give you an example of something building on Xunit's existing functionality which would cover some of the basic cases you mentioned.

public static void AssertTemplateValidAsync<TSource>(string template, TSource view)
{
    if (assert == null)
    {
        throw new ArgumentNullException(nameof(assert));
    }

    var exception = Record.Exception(() =>
    {
        StaticStubbleRenderer.Instance.Render(template, view, new Settings.RenderSettings
        {
            ThrowOnDataMiss = true,
        });
    });

    if (exception is StubbleDataMissException dataMissException)
    {
        throw new Exception("Data was missing in template", dataMissException);
    }
    else if (exception is StubbleException stubbleException)
    {
        throw new Exception("An error occured validating template", stubbleException);
    }

    Assert.Null(exception);
}

Please let me know if you have any issues, thanks for using the library!