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// 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 testing_test
import (
"sync"
"testing"
)
// The line numbering of this file is important for TestTBHelper.
func notHelper(t *testing.T, msg string) {
t.Error(msg)
}
func helper(t *testing.T, msg string) {
t.Helper()
t.Error(msg)
}
func notHelperCallingHelper(t *testing.T, msg string) {
helper(t, msg)
}
func helperCallingHelper(t *testing.T, msg string) {
t.Helper()
helper(t, msg)
}
func genericHelper[G any](t *testing.T, msg string) {
t.Helper()
t.Error(msg)
}
var genericIntHelper = genericHelper[int]
func testTestHelper(t *testing.T) {
testHelper(t)
}
func testHelper(t *testing.T) {
// Check combinations of directly and indirectly
// calling helper functions.
notHelper(t, "0")
helper(t, "1")
notHelperCallingHelper(t, "2")
helperCallingHelper(t, "3")
// Check a function literal closing over t that uses Helper.
fn := func(msg string) {
t.Helper()
t.Error(msg)
}
fn("4")
t.Run("sub", func(t *testing.T) {
helper(t, "5")
notHelperCallingHelper(t, "6")
// Check that calling Helper from inside a subtest entry function
// works as if it were in an ordinary function call.
t.Helper()
t.Error("7")
})
// Check that right caller is reported for func passed to Cleanup when
// multiple cleanup functions have been registered.
t.Cleanup(func() {
t.Helper()
t.Error("10")
})
t.Cleanup(func() {
t.Helper()
t.Error("9")
})
// Check that helper-ness propagates up through subtests
// to helpers above. See https://golang.org/issue/44887.
helperSubCallingHelper(t, "11")
// Check that helper-ness propagates up through panic/recover.
// See https://golang.org/issue/31154.
recoverHelper(t, "12")
genericHelper[float64](t, "GenericFloat64")
genericIntHelper(t, "GenericInt")
}
func parallelTestHelper(t *testing.T) {
var wg sync.WaitGroup
for i := 0; i < 5; i++ {
wg.Add(1)
go func() {
notHelperCallingHelper(t, "parallel")
wg.Done()
}()
}
wg.Wait()
}
func helperSubCallingHelper(t *testing.T, msg string) {
t.Helper()
t.Run("sub2", func(t *testing.T) {
t.Helper()
t.Fatal(msg)
})
}
func recoverHelper(t *testing.T, msg string) {
t.Helper()
defer func() {
t.Helper()
if err := recover(); err != nil {
t.Errorf("recover %s", err)
}
}()
doPanic(t, msg)
}
func doPanic(t *testing.T, msg string) {
t.Helper()
panic(msg)
}