Using go1.5.1

I have been relying on this behavior for some time and just assumed that it was always true, but when I looked through the documentation for go help test it doesn't mention this fact at all.

Many benchmarks make this assumption when they load test files from a testdata directory that is relative to the package directory.

Because go test sets the PWD, stuff like this works from anywhere:

rawr@carbonite: /tmp $ go test compress/flate -run none -bench .
PASS
BenchmarkDecodeDigitsSpeed1e4-4        10000        194030 ns/op      51.54 MB/s       40301 B/op          7 allocs/op
...

But compiling the test binary does not:

rawr@carbonite: /tmp $ go test -c compress/flate
rawr@carbonite: /tmp $ ./flate.test -test.run none -test.bench .
PASS
BenchmarkDecodeDigitsSpeed1e4-4     --- FAIL: BenchmarkDecodeDigitsSpeed1e4-4
    reader_test.go:45: open ../testdata/e.txt: no such file or directory
...

I think the fact that the compiled version fails is WAI, but this behavior should be documented.