review tests on Windows

[christian-korneck]

some tests aren't working on Windows, probably never have.

[RolandMa1986]

Hi @christian-korneck,

I found 3 issues when running test ong windows. But I'm not sure whether it's a environment or os specific for the first two issues.

1. getvalue method can't be found on windows
   

   cpy3/high_level_layer_test.go

   Line 19 in 8f74340

   result := stdout.CallMethodArgs("getvalue")

2. I got a PyExc_KeyboardInterrupt which don't match PyExc_TypeError.
   

   cpy3/errors_test.go

   Line 250 in 8f74340

   assert.True(t, PyErr_GivenExceptionMatches(exc, PyExc_TypeError))

3. File path is diffrent. This issue can be fixed by trim "/"
   

   cpy3/module_test.go

   Line 110 in 8f74340

   assert.True(t, strings.HasSuffix(filename, "/queue.py"))

[christian-korneck]

thanks, would love to see PRs to fix these.