fix(appveyor): fix up failing unit tests on Windows

[bacongobbler]

Signed-off-by: Matthew Fisher matt.fisher@microsoft.com

closes #2456
closes #3690

[bacongobbler]

woop! We have legitimate Windows test failures. 🎉

[radu-matei]

I think it has to do with how git is configured on the Windows box (specifically the behaviour of Git Bash when using PowerShell), but:

• when using PowerShell:

 $ go.exe test k8s.io\helm\pkg\getter -run ^TestPluginGetter$
--- FAIL: TestPluginGetter (0.03s)
    plugingetter_test.go:83: exec: "echo": executable file not found in %PATH%
FAIL
FAIL    k8s.io/helm/pkg/getter  0.093s

• when using Git Bash:

$ go.exe test k8s.io/helm/pkg/getter -run ^TestPluginGetter$
ok      k8s.io/helm/pkg/getter  0.160s

This boils down to echo being a command under Windows, and not an executable, as for UNIX systems. So while the AppVeyor tests might be passing (since most likely they run under Git Bash), under regular PowerShell TestPluginGetter fails.

[bacongobbler]

okay. I've skipped that particular test because there is no equivalent to echo on Windows, as it's a builtin command for cmd.exe and therefore not an executable.

[radu-matei]

LGTM