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// Copyright 2021 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 event_test
import (
"testing"
"time"
"golang.org/x/exp/event"
)
func TestOfAs(t *testing.T) {
const i = 3
var v event.Value
v = event.Int64Of(i)
if got := v.Int64(); got != i {
t.Errorf("got %v, want %v", got, i)
}
v = event.Uint64Of(i)
if got := v.Uint64(); got != i {
t.Errorf("got %v, want %v", got, i)
}
v = event.Float64Of(i)
if got := v.Float64(); got != i {
t.Errorf("got %v, want %v", got, i)
}
v = event.BoolOf(true)
if got := v.Bool(); got != true {
t.Errorf("got %v, want %v", got, true)
}
const s = "foo"
v = event.StringOf(s)
if got := v.String(); got != s {
t.Errorf("got %v, want %v", got, s)
}
tm := time.Now()
v = event.ValueOf(tm)
if got := v.Interface(); got != tm {
t.Errorf("got %v, want %v", got, tm)
}
var vnil event.Value
if got := vnil.Interface(); got != nil {
t.Errorf("got %v, want nil", got)
}
}
func panics(f func()) (b bool) {
defer func() {
if x := recover(); x != nil {
b = true
}
}()
f()
return false
}
func TestPanics(t *testing.T) {
for _, test := range []struct {
name string
f func()
}{
{"int64", func() { event.Float64Of(3).Int64() }},
{"uint64", func() { event.Int64Of(3).Uint64() }},
{"float64", func() { event.Uint64Of(3).Float64() }},
{"bool", func() { event.Int64Of(3).Bool() }},
} {
if !panics(test.f) {
t.Errorf("%s: got no panic, want panic", test.name)
}
}
}
func TestString(t *testing.T) {
for _, test := range []struct {
v event.Value
want string
}{
{event.Int64Of(-3), "-3"},
{event.Uint64Of(3), "3"},
{event.Float64Of(.15), "0.15"},
{event.BoolOf(true), "true"},
{event.StringOf("foo"), "foo"},
{event.ValueOf(time.Duration(3 * time.Second)), "3s"},
} {
if got := test.v.String(); got != test.want {
t.Errorf("%#v: got %q, want %q", test.v, got, test.want)
}
}
}
func TestNoAlloc(t *testing.T) {
// Assign values just to make sure the compiler doesn't optimize away the statements.
var (
i int64
u uint64
f float64
b bool
s string
x interface{}
p = &i
)
a := int(testing.AllocsPerRun(5, func() {
i = event.Int64Of(1).Int64()
u = event.Uint64Of(1).Uint64()
f = event.Float64Of(1).Float64()
b = event.BoolOf(true).Bool()
s = event.StringOf("foo").String()
x = event.ValueOf(p).Interface()
}))
if a != 0 {
t.Errorf("got %d allocs, want zero", a)
}
_ = u
_ = f
_ = b
_ = s
_ = x
}