test: add testlib

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5676077

test/run

@@ -67,7 +67,8 @@ do
 		fi
 		export F=$(basename $i .go)
 		export D=$dir
-		sed '/^\/\//!q' $i | sed 's@//@@; $d' |sed 's|./\$A.out|$E &|g' >"$RUNFILE"
+		echo '. ./testlib' >"$RUNFILE"
+		sed '/^\/\//!q' $i | sed 's@//@@; $d' |sed 's|./\$A.out|$E &|g' >>"$RUNFILE"
 		if ! { time -p bash -c "bash '$RUNFILE' >'$TMP1FILE' 2>&1" ; } 2>"$TMP2FILE"
 		then
 			echo

test/testlib

@@ -0,0 +1,22 @@
+# Copyright 2012 The Go Authors.  All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+# These function names are also known to
+# (and are the plan for transitioning to) run.go.
+
+compile() {
+	$G $D/$F.go
+}
+
+build() {
+	$G $D/$F.go && $L $F.$A
+}
+
+run() {
+	$G $D/$F.go && $L $F.$A && ./$A.out "$@"
+}
+
+errorcheck() {
+	errchk $G -e $D/$F.go
+}