C:\a\code\src\foo>set | find "GO"
GOARCH=386
GOBIN=c:\mingw\go\bin
GOPATH=c:\a\code
GOROOT=c:\mingw\go

C:\a\code\src\foo>dir
 Volume in drive C has no label.

 Directory of C:\a\code\src\foo

02/03/2012  12:11 PM    <DIR>          .
02/03/2012  12:11 PM    <DIR>          ..
31/01/2012  10:30 AM               516 foo.go
31/01/2012  09:59 AM               100 foo_test.go
               2 File(s)            616 bytes
               2 Dir(s)  129,742,303,232 bytes free

C:\a\code\src\foo>type foo_test.go
package main

import "fmt"
import "testing"

func TestMain(t *testing.T) {
        fmt.Printf("Hello\n")
}

C:\a\code\src\foo>go test
# C:\a\code\src\foo
mkdir C:\DOCUME~1\brainman\LOCALS~1\Temp\go-build374523082\C:: The filename, directory
name, or volume label syntax is incorrect.

C:\a\code\src\foo>go version
go version weekly.2012-02-22 +a1838a690f0a

C:\a\code\src\foo>