When running Golang tests, a line break occurs every 1024 characters.

[0xwhatly]

Code:

func Test_output(t *testing.T) {
	var (
		str = ""
	)
	for i := 0; i < 3000; i++ {
		str += fmt.Sprintf("%d", i)
	}
	fmt.Println(str)
}

Run method:
click run testbutton

Test out:

If i click debug test button,print string is normal