testing: use flag.Duration for -timeout flag.

R=golang-dev, gustavo, r
CC=golang-dev
https://golang.org/cl/5498077

src/Make.pkg

@@ -65,7 +65,7 @@ test:
 	gotest
 
 testshort:
-	gotest -test.short -test.timeout=120
+	gotest -test.short -test.timeout=2m
 
 bench:
 	gotest -test.bench=. -test.run="Do not run tests"

src/cmd/go/test.go

@@ -118,8 +118,8 @@ The resulting test binary, called test.out, has its own flags:
 	    the Go tree can run a sanity check but not spend time running
 	    exhaustive tests.
 
-	-test.timeout n
-		If a test runs longer than n seconds, panic.
+	-test.timeout t
+		If a test runs longer than t, panic.
 
 	-test.benchtime n
 		Run enough iterations of each benchmark to take n seconds.

src/cmd/gotest/doc.go

@@ -75,7 +75,7 @@ Usage:
 		[-test.cpuprofile=cpu.out] \
 		[-test.memprofile=mem.out] [-test.memprofilerate=1] \
 		[-test.parallel=$GOMAXPROCS] \
-		[-test.timeout=10] [-test.short] \
+		[-test.timeout=10s] [-test.short] \
 		[-test.benchtime=3] [-test.cpu=1,2,3,4]
 
 The -test.v flag causes the tests to be logged as they run.  The
@@ -117,7 +117,7 @@ time.  It is off by default but set by all.bash so installations of
 the Go tree can do a sanity check but not spend time running
 exhaustive tests.
 
-The -test.timeout flag sets a timeout for the test in seconds.  If the
+The -test.timeout flag sets a timeout for the test.  If the
 test runs for longer than that, it will panic, dumping a stack trace
 of all existing goroutines.
 

src/pkg/testing/testing.go

@@ -63,7 +63,7 @@ var (
 	memProfile     = flag.String("test.memprofile", "", "write a memory profile to the named file after execution")
 	memProfileRate = flag.Int("test.memprofilerate", 0, "if >=0, sets runtime.MemProfileRate")
 	cpuProfile     = flag.String("test.cpuprofile", "", "write a cpu profile to the named file during execution")
-	timeout        = flag.Int64("test.timeout", 0, "if > 0, sets time limit for tests in seconds")
+	timeout        = flag.Duration("test.timeout", 0, "if positive, sets an aggregate time limit for all tests")
 	cpuListStr     = flag.String("test.cpu", "", "comma-separated list of number of CPUs to use for each test")
 	parallel       = flag.Int("test.parallel", runtime.GOMAXPROCS(0), "maximum test parallelism")
 
@@ -346,7 +346,7 @@ var timer *time.Timer
 // startAlarm starts an alarm if requested.
 func startAlarm() {
 	if *timeout > 0 {
-		timer = time.AfterFunc(time.Duration(*timeout)*time.Second, alarm)
+		timer = time.AfterFunc(*timeout, alarm)
 	}
 }