Allow randomizing 'Guid' test arguments with [Random]

[julealgon]

[Random] currently supports several primitive types (mostly numeric ones), but it does not work with Guid. To provide different values to a Guid argument, one has to manually provide them either via [TestCaseSource] or via [ValueSource].

In my experience, being able to easily provide different Guid values to a test is fairly useful. Currently, I'm doing this by using a ValueSource, which caused a different problem, forcing me to resort to hardcoded Guids instead of using Guid.NewGuid.

I'm aware that Guid randomization is different than the standard one using the Random class, so I'm not sure if it would be possible to have the same "seed" in discovery and execution phases to build the unique test names with the built-in values (probably not).

[julealgon]

The last part of my post is probably not true as per this comment from @jnm2 :

In the meantime, that suggests the workaround you could use. Instead of Guid.NewGuid(), use TestContext.CurrentContext.Random.NextGuid().

I guess you could then easily leverage this for generating the random Guid values in a consistent manner like any other random values are created today.

[mikkelbu]

Closed by #3951