package main

import (
	"io"
	"testing"
)

func TestSizableZeroReader(t *testing.T) {
	t.Log("Testng for SizableZeroReader...")
	TestingRead(t, 0)
	TestingRead(t, 1)
	TestingRead(t, 1024)
	TestingRead(t, 114514)
	TestingRead(t, 1919810)
	t.Log("Test SizableZeroReader OK.")
}

func TestingRead(t *testing.T, sz int) {
	rd := NewSizableZeroReader(sz)
	bin, err := io.ReadAll(rd)
	if err != nil {
		t.Errorf("failed test with size %d: %v", sz, err)
		return
	}
	l := len(bin)
	if l != sz {
		t.Errorf("length not match: realSize=%d, expectSize=%d", l, sz)
		return
	}
	for _, v := range bin {
		if v != 0 {
			t.Errorf("some value not zero")
			return
		}
	}
}