Add test scripts and documentation

[meaghanlewis]

Working on simple scripts to run the tests on both Mac and Windows. Also added a how-to-test doc to describe the tests and how to run them.

I haven't scripted much, so feedback is appreciated!

[StanleyGoldman]

I just tried this out on Windows. so far it seems to be working well..

My first thought is, since ./build.sh and build.cmd both build in Debug by default.
Maybe ./test.sh and test.cmd should both test in Debug by default as well.

[meaghanlewis]

Thanks for the feedback @StanleyGoldman, so to test in Debug by default I can just set the configuration to Debug, right?

[meaghanlewis]

thanks for your changes @StanleyGoldman

Adding some observations about running the tests on mac.

running ./test.sh results in:
packages\NUnit.Runners.2.6.4\tools\nunit-console.exe: command not found

when i try to run the nunit-console with mono (ex. mono packages/NUnit.Runners.2.6.4/tools/nunit-console.exe), it starts successfully

but when i run any tests (ex. mono packages/NUnit.Runners.2.6.4/tools/nunit-console.exe "build/IntegrationTests/IntegrationTests.dll") all the tests fail immediately and I see a lot of messages similar to this:
Method IntegrationTests.BaseIntegrationTest:TestFixtureSetUp ()' is inaccessible from method GitHub.Unity.Guard:set_InUnitTestRunner

[StanleyGoldman]

So I have no idea yet how to make this run in mono, but I'm happy enough having it work on windows for now. I'm going to merge this in and add an issue for it.

[meaghanlewis]

Thanks @StanleyGoldman for merging this and creating the test.sh issue 🎉