ArgumentOutOfRangeException thrown by Allure.NUnit if a test doesn't have a namespace

[delatrie]

I'm submitting a ...

• bug report
• feature request
• support request => Please do not submit support request here, see note at the top of this template.

What is the current behavior?

Allure.NUnit throws an exception if no namespace is defined for a test.

If the current behavior is a bug, please provide the steps to reproduce and if possible, a minimal demo of the problem

Given the following test:

using NUnit.Allure.Core;
using NUnit.Framework;

[AllureNUnit]
class MyTestFixture
{
    [Test]
    public void MyTest() { }
}

When we run it, Allure.NUnit throws ArgumentOutOfRangeException with the message "Length cannot be less than zero.".

What is the expected behavior?

No exception is thrown. The report successfully generated.

Please tell us about your environment:

• Allure version: 2.23.0
• Test framework: nunit@3.13.3
• Allure adaptor: allure-nunit@2.9.5-preview.1

Other information

The exception is thrown because of the following code:

allure-csharp/Allure.NUnit/Core/AllureNUnitHelper.cs

Lines 58 to 60 in 4a55fce

	Label.Package(_test.ClassName?.Substring(0, _test.ClassName.LastIndexOf('.'))),
	Label.TestMethod(_test.MethodName),
	Label.TestClass(_test.ClassName?.Substring(_test.ClassName.LastIndexOf('.') + 1))

Here LastIndexOf may return -1 in case there is no '.' in a class name leading to the exception in the Substring method. The only case there is no '.' symbol in the full name of a class is when the class doesn't have a namespace.