I notice you have fixed the test by changing the copyright check to ...

lines[0].Should().StartWithEquivalent("testhost");
lines[1].Should().StartWithEquivalent("© Microsoft Corporation");

This is probably correctly for the build server but unfortunately still fails on my local machine because I use Ncrunch (continuous test runner) and so the assumption about the name of the test-runner is incorrect. I would suggest simply not testing the copyright lines OR raising a feature request to ensure that the lines are consistent with the .net framework build.

NCrunch is a good testing suit but it's commercial (not free).
dotnet test suit is free and available in both local machine and CI servers (windows/Linux and OS X) and so simplify the fix of test between the Contributors and unify test result report.

I can modify the PR and set these copyright values as a constant in a separate class so you can replace your constant values during local test.

All I did in my local machine is run the command:

       dotnet   test

Is there any constraint in your development Environment of using dotnet test with Xunit?

My point is more that you really don't want to discourage contributors from running local unit tests and hard-coding an assumption on the test-runner is bad practice for plenty of reasons - not least of which you might one day change your build system and some future maintainer will then by mystified by the fact that half the unit-tests break ;-) A unit test should really not be relying on an 'external' variable such as the name of the calling process.

I agree with you that unit test should really not be relying on an 'external' variable.
The problem is that the majority of test cases depend on some hard-wired values that is based on test suit runners.
I will investigate of excluding these copyright value test and modify my PR.

You can exclude these copyright tests from the test case and continue using NCrunch .

Here is a better fix (also better than my local changes)… Bearing in mind the intention of the test is to establish that the help-text contains the copyright info you can use

lines[1].Should().Contain(CopyrightInfo.Default.ToString());

which works for all platforms and test runners!
I'll post the equivalent formulation for lines[0] when I find it...

Ok- here are the two lines you want to use. These are platform independent so you can get rid of the #if check....

            lines[0].Should().Be(HeadingInfo.Default.ToString());
            lines[1].Should().Be(CopyrightInfo.Default.ToString());

Establishing that the ReflectionHelper (which is used by HeadingInfo and CopyrightInfo) does correctly pull attributes from the assembly is a separate concern and should be tested separately.

Good solution.
I'll modify my PR and use your solution :).

@NeilMacMullen
Modification based on your solution is done in this PR,(a939e1e), and test pass successfully in CI appveyor.

hooray! :-) Are you planning to merge this back to develop? If so I will integrate it with my PR.

Yes, I plan to merge it with other PRs including your PR in develop.
You can do (if needed) an integration test with it in a throw-away branch to be sure that all tests works in your PR. No need you merge it into yours. This simplify the last minute maintenance of PR(s).