Adds test of Enum.HasFlag related tests.

[SandorDobos]

To support case in nanoframework/Home#730.

Description

Added two new test methods.

Motivation and Context

• Resolves Enum.HasFlag throws ArgumentException Home#730

How Has This Been Tested?

Tests were executed

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[josesimoes]

@SandorDobos seems that we've had the same idea at the same time. 😆
I've also made several improvements in the Enum Tests. As it seems less work, care to add this test to #130 ?

[SandorDobos]

I revoke this PR and recreate it on up2date codebase.