mirror of https://go.googlesource.com/go
55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime_test
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import (
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"reflect"
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"runtime"
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"runtime/metrics"
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"testing"
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)
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func TestPanicNil(t *testing.T) {
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t.Run("default", func(t *testing.T) {
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checkPanicNil(t, new(runtime.PanicNilError))
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})
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t.Run("GODEBUG=panicnil=0", func(t *testing.T) {
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t.Setenv("GODEBUG", "panicnil=0")
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checkPanicNil(t, new(runtime.PanicNilError))
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})
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t.Run("GODEBUG=panicnil=1", func(t *testing.T) {
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t.Setenv("GODEBUG", "panicnil=1")
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checkPanicNil(t, nil)
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})
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}
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func checkPanicNil(t *testing.T, want any) {
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name := "/godebug/non-default-behavior/panicnil:events"
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s := []metrics.Sample{{Name: name}}
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metrics.Read(s)
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v1 := s[0].Value.Uint64()
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defer func() {
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e := recover()
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if reflect.TypeOf(e) != reflect.TypeOf(want) {
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println(e, want)
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t.Errorf("recover() = %v, want %v", e, want)
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panic(e)
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}
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metrics.Read(s)
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v2 := s[0].Value.Uint64()
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if want == nil {
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if v2 != v1+1 {
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t.Errorf("recover() with panicnil=1 did not increment metric %s", name)
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}
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} else {
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if v2 != v1 {
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t.Errorf("recover() with panicnil=0 incremented metric %s: %d -> %d", name, v1, v2)
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}
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}
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}()
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panic(nil)
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}
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