path/filepath: avoid assuming that GOROOT/test is present
GOROOT/test is pruned out by cmd/distpack. It isn't really needed for
the test anyway; the test can instead use the "src/unicode" subdirectory,
which is even within the same module.
This test was previously adjusted in CL
13467045 and CL 31859.
Unlike in previous iterations of the test, the directories used in
this revision are covered by the Go 1 compatibility policy and thus
unlikely to disappear.
For #24904.
Change-Id: I156ae18354bcbc2ddd8d22b210f16ba1e97cd5d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/504116
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>