/*
❯ cat testlogger_test.go
*/
package testlogger

import (
	"fmt"
	"testing"
	"time"
)

func TestMain(m *testing.M) {
	m.Run()
	time.Sleep(100 * time.Millisecond) // also sometimes works without testmain, but more consistent with next test
}

func TestABefore(t *testing.T) {
	go func() {
		t.Logf("sleeping")
		time.Sleep(10 * time.Millisecond)
		t.Logf("too late")
		fmt.Println("goroutine done") // prove it ran
	}()
	time.Sleep(time.Millisecond)
}

func TestZLater(t *testing.T) {
	t.Logf("another test")
	time.Sleep(time.Second) // make sure the process hangs around long enough
}

/*
❯ go test -count 1 -v -race ./...
=== RUN   TestABefore
    testlogger_test.go:15: sleeping
--- PASS: TestABefore (0.00s)
=== RUN   TestZLater
    testlogger_test.go:24: another test
goroutine done
--- PASS: TestZLater (1.00s)
PASS
ok  	example.com/testlogger_test.go	1.465s
*/

/*
❯ cat testlogger_test.go
*/
package testlogger

import (
	"fmt"
	"testing"
	"time"
)

var done = make(chan struct{})

func TestMain(m *testing.M) {
	m.Run()
	close(done)  // happens-after t.done = true
	time.Sleep(100 * time.Millisecond)
}
func TestABefore(t *testing.T) {
	go func() {
		t.Logf("sleeping")
		time.Sleep(10 * time.Millisecond)
		<-done
		t.Logf("too late") // now also happens-after t.done = true
		fmt.Println("goroutine done")
	}()
	time.Sleep(time.Millisecond)
}

func TestZLater(t *testing.T) {
	t.Logf("another test")
	time.Sleep(time.Second)
}

/*
❯ go test -count 1 -v -race ./...
=== RUN   TestABefore
    testlogger_test.go:17: sleeping
--- PASS: TestABefore (0.00s)
PASS
panic: Log in goroutine after TestABefore has completed: too late

goroutine 35 [running]:
testing.(*common).logDepth(0x14000410820, {0x14000133f70, 0x8}, 0x3)
	/Users/stevenl/go/pkg/mod/golang.org/[email protected]/src/testing/testing.go:1028 +0x3d0
testing.(*common).log(...)
	/Users/stevenl/go/pkg/mod/golang.org/[email protected]/src/testing/testing.go:1010
testing.(*common).Logf(0x14000410820, {0x1006c4df4?, 0x0?}, {0x0?, 0x0?, 0x0?})
	/Users/stevenl/go/pkg/mod/golang.org/[email protected]/src/testing/testing.go:1061 +0x5c
example.com/testlogger.TestABefore.func1()
	/Users/stevenl/go/src/example.com/testlogger/testlogger_test.go:19 +0x6c
created by example.com/testlogger.TestABefore in goroutine 34
	/Users/stevenl/go/src/example.com/testlogger/testlogger_test.go:16 +0x5c
FAIL	example.com/testlogger	0.331s
FAIL
*/

		// Do not lock t.done to allow race detector to detect race in case
		// the user does not appropriately synchronize a goroutine.
		t.done = true