Add tests exposing a paths issue.

[petemounce]

On windows, absolute paths start either with \ or with c: (as in, drive-letter then colon)

[lox]

😅

[lox]

Thanks @petemounce, we've still got a lot of little quirks to work out with windows paths. Assuming this test will fail?

[petemounce]

@lox yes - https://forum.buildkite.community/t/bug-config-on-windows-doesnt-do-what-i-thought/182/3

Sorry, should have replicated that post here. I run the agent with NSSM, configured like:

nssm dump buildkite-agent

nssm.exe install buildkite-agent "c:/program files/buildkite-agent/buildkite-agent.exe"
nssm.exe set buildkite-agent AppParameters "start --config 'c:\programdata\buildkite-agent\buildkite-agent.cfg'"
nssm.exe set buildkite-agent AppDirectory "C:\program files\buildkite-agent"
nssm.exe set buildkite-agent AppExit Default Restart
nssm.exe set buildkite-agent AppStdout c:/programdata/buildkite-agent/buildkite-agent.log
nssm.exe set buildkite-agent AppStdoutCreationDisposition 2
nssm.exe set buildkite-agent AppStderr c:/programdata/buildkite-agent/buildkite-agent.log
nssm.exe set buildkite-agent AppStderrCreationDisposition 2
nssm.exe set buildkite-agent AppRotateFiles 1
nssm.exe set buildkite-agent AppRotateOnline 0
nssm.exe set buildkite-agent AppRotateSeconds 86400
nssm.exe set buildkite-agent AppRotateBytes 104858
nssm.exe set buildkite-agent DependOnService :buildkite-registration
nssm.exe set buildkite-agent DisplayName buildkite-agent
nssm.exe set buildkite-agent Environment :BUILDKITE_AGENT_TOKEN={redacted}
nssm.exe set buildkite-agent ObjectName .\buildkite-agent "****"
nssm.exe set buildkite-agent Start SERVICE_AUTO_START
nssm.exe set buildkite-agent Type SERVICE_WIN32_OWN_PROCESS

I see a fatal error in the log file:

2018-12-21 00:09:31 FATAL  A configuration file could not be found at: "C:\\program files\\buildkite-agent\\'c:\\programdata\\buildkite-agent\\buildkite-agent.cfg'"

[lox]

I'm going to merge this and then fix it, thanks @petemounce.