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// Copyright 2018 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.
package packages_test
import (
"runtime"
"testing"
"time"
"golang.org/x/tools/go/packages"
"golang.org/x/tools/internal/testenv"
)
// This test loads the metadata for the standard library,
func TestStdlibMetadata(t *testing.T) {
testenv.NeedsGoPackages(t)
runtime.GC()
t0 := time.Now()
var memstats runtime.MemStats
runtime.ReadMemStats(&memstats)
alloc := memstats.Alloc
// Load, parse and type-check the program.
cfg := &packages.Config{Mode: packages.LoadAllSyntax}
pkgs, err := packages.Load(cfg, "std")
if err != nil {
t.Fatalf("failed to load metadata: %v", err)
}
if packages.PrintErrors(pkgs) > 0 {
t.Fatal("there were errors loading standard library")
}
t1 := time.Now()
runtime.GC()
runtime.ReadMemStats(&memstats)
runtime.KeepAlive(pkgs)
t.Logf("Loaded %d packages", len(pkgs))
numPkgs := len(pkgs)
want := 150 // 186 on linux, 185 on windows.
if numPkgs < want {
t.Errorf("Loaded only %d packages, want at least %d", numPkgs, want)
}
t.Log("GOMAXPROCS: ", runtime.GOMAXPROCS(0))
t.Log("Metadata: ", t1.Sub(t0)) // ~800ms on 12 threads
t.Log("#MB: ", int64(memstats.Alloc-alloc)/1000000) // ~1MB
}
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