1 files changed, 83 insertions, 0 deletions
diff --git a/src/internal/cpu/cpu_test.go b/src/internal/cpu/cpu_test.go
new file mode 100644
index 0000000..2de7365
--- /dev/null
+++ b/src/internal/cpu/cpu_test.go
@@ -0,0 +1,83 @@
+// Copyright 2017 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 cpu_test
+
+import (
+	. "internal/cpu"
+	"internal/testenv"
+	"os"
+	"os/exec"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+func TestMinimalFeatures(t *testing.T) {
+	// TODO: maybe do MustSupportFeatureDectection(t) ?
+	if runtime.GOARCH == "arm64" {
+		switch runtime.GOOS {
+		case "linux", "android", "darwin":
+		default:
+			t.Skipf("%s/%s is not supported", runtime.GOOS, runtime.GOARCH)
+		}
+	}
+
+	for _, o := range Options {
+		if o.Required && !*o.Feature {
+			t.Errorf("%v expected true, got false", o.Name)
+		}
+	}
+}
+
+func MustHaveDebugOptionsSupport(t *testing.T) {
+	if !DebugOptions {
+		t.Skipf("skipping test: cpu feature options not supported by OS")
+	}
+}
+
+func MustSupportFeatureDectection(t *testing.T) {
+	// TODO: add platforms that do not have CPU feature detection support.
+}
+
+func runDebugOptionsTest(t *testing.T, test string, options string) {
+	MustHaveDebugOptionsSupport(t)
+
+	testenv.MustHaveExec(t)
+
+	env := "GODEBUG=" + options
+
+	cmd := exec.Command(os.Args[0], "-test.run="+test)
+	cmd.Env = append(cmd.Env, env)
+
+	output, err := cmd.CombinedOutput()
+	lines := strings.Fields(string(output))
+	lastline := lines[len(lines)-1]
+
+	got := strings.TrimSpace(lastline)
+	want := "PASS"
+	if err != nil || got != want {
+		t.Fatalf("%s with %s: want %s, got %v", test, env, want, got)
+	}
+}
+
+func TestDisableAllCapabilities(t *testing.T) {
+	MustSupportFeatureDectection(t)
+	runDebugOptionsTest(t, "TestAllCapabilitiesDisabled", "cpu.all=off")
+}
+
+func TestAllCapabilitiesDisabled(t *testing.T) {
+	MustHaveDebugOptionsSupport(t)
+
+	if os.Getenv("GODEBUG") != "cpu.all=off" {
+		t.Skipf("skipping test: GODEBUG=cpu.all=off not set")
+	}
+
+	for _, o := range Options {
+		want := o.Required
+		if got := *o.Feature; got != want {
+			t.Errorf("%v: expected %v, got %v", o.Name, want, got)
+		}
+	}
+}