1// Copyright 2017 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package cpu_test
6
7import (
8	. "internal/cpu"
9	"internal/godebug"
10	"internal/testenv"
11	"os"
12	"os/exec"
13	"testing"
14)
15
16func MustHaveDebugOptionsSupport(t *testing.T) {
17	if !DebugOptions {
18		t.Skipf("skipping test: cpu feature options not supported by OS")
19	}
20}
21
22func MustSupportFeatureDetection(t *testing.T) {
23	// TODO: add platforms that do not have CPU feature detection support.
24}
25
26func runDebugOptionsTest(t *testing.T, test string, options string) {
27	MustHaveDebugOptionsSupport(t)
28
29	testenv.MustHaveExec(t)
30
31	env := "GODEBUG=" + options
32
33	cmd := exec.Command(os.Args[0], "-test.run=^"+test+"$")
34	cmd.Env = append(cmd.Env, env)
35
36	output, err := cmd.CombinedOutput()
37	if err != nil {
38		t.Fatalf("%s with %s: run failed: %v output:\n%s\n",
39			test, env, err, string(output))
40	}
41}
42
43func TestDisableAllCapabilities(t *testing.T) {
44	MustSupportFeatureDetection(t)
45	runDebugOptionsTest(t, "TestAllCapabilitiesDisabled", "cpu.all=off")
46}
47
48func TestAllCapabilitiesDisabled(t *testing.T) {
49	MustHaveDebugOptionsSupport(t)
50
51	if godebug.New("#cpu.all").Value() != "off" {
52		t.Skipf("skipping test: GODEBUG=cpu.all=off not set")
53	}
54
55	for _, o := range Options {
56		want := false
57		if got := *o.Feature; got != want {
58			t.Errorf("%v: expected %v, got %v", o.Name, want, got)
59		}
60	}
61}
62