}
	// check empty or full
	if !rb.IsEmpty() {
		t.Fatalf("expect IsEmpty is true but got false")
	}
	if rb.IsFull() {
		t.Fatalf("expect IsFull is false but got true")
	}
}

func TestRingBufferCloseError(t *testing.T) {
	type testError1 struct{ error }
	type testError2 struct{ error }

	rb := New(100)
	rb.CloseWithError(testError1{})
	if _, err := rb.Write(nil); err != (testError1{}) {