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// Copyright 2023 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 runtime_test
import (
"reflect"
"runtime"
"runtime/metrics"
"testing"
)
func TestPanicNil(t *testing.T) {
t.Run("default", func(t *testing.T) {
checkPanicNil(t, new(runtime.PanicNilError))
})
t.Run("GODEBUG=panicnil=0", func(t *testing.T) {
t.Setenv("GODEBUG", "panicnil=0")
checkPanicNil(t, new(runtime.PanicNilError))
})
t.Run("GODEBUG=panicnil=1", func(t *testing.T) {
t.Setenv("GODEBUG", "panicnil=1")
checkPanicNil(t, nil)
})
}
func checkPanicNil(t *testing.T, want any) {
name := "/godebug/non-default-behavior/panicnil:events"
s := []metrics.Sample{{Name: name}}
metrics.Read(s)
v1 := s[0].Value.Uint64()
defer func() {
e := recover()
if reflect.TypeOf(e) != reflect.TypeOf(want) {
println(e, want)
t.Errorf("recover() = %v, want %v", e, want)
panic(e)
}
metrics.Read(s)
v2 := s[0].Value.Uint64()
if want == nil {
if v2 != v1+1 {
t.Errorf("recover() with panicnil=1 did not increment metric %s", name)
}
} else {
if v2 != v1 {
t.Errorf("recover() with panicnil=0 incremented metric %s: %d -> %d", name, v1, v2)
}
}
}()
panic(nil)
}