Function TestReadFileRefusesNonRegular

internal/tools/nonregular_unix_test.go:37–49

TestReadFileRefusesNonRegular: read_file on a FIFO would block forever in open(2) waiting for a writer, leaking the tool goroutine past Ctrl+C (which cancels the turn but cannot unblock the read); an endless device file would grow the buffer without bound. The Stat guard must refuse without opening.

(t *testing.T)

// If the guard is missing, this test hangs rather than fails - the timeout is
// the assertion.
func TestReadFileRefusesNonRegular(t *testing.T) {
	path := mkfifo(t)
	done := make(chan string, 1)
	go func() { done <- ReadFile(path) }()
	select {
	case got := <-done:
		if !strings.Contains(got, "not a regular file") {
			t.Fatalf("want a not-a-regular-file refusal, got %q", got)
		}
	case <-timeoutC(t):
		t.Fatal("ReadFile blocked on the FIFO instead of refusing")
	}
}

// TestWriteFileRefusesNonRegular: write_file to an existing FIFO with no
// reader blocks identically in open(2) O_WRONLY; same guard, same contract.