package com.peachpasswords.ui.components

import org.junit.Assert.assertArrayEquals
import org.junit.Assert.assertNull
import org.junit.Test

class FaviconsTest {

    @Test fun unwraps_png_inside_ico_container() {
        val png = byteArrayOf(0x89.toByte(), 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 1, 2, 3)
        val ico = ByteArray(22 + png.size)
        ico[2] = 1 // ICO type
        ico[18] = 22 // data offset, little-endian
        png.copyInto(ico, 22)
        assertArrayEquals(png, decodeOrUnwrapIco(ico))
    }

    @Test fun passes_non_ico_bytes_through_and_rejects_ico_without_png() {
        val png = byteArrayOf(0x89.toByte(), 0x50, 0x4E, 0x47, 1, 2, 3)
        assertArrayEquals(png, decodeOrUnwrapIco(png))

        val icoBmp = ByteArray(22 + 4)
        icoBmp[2] = 1
        icoBmp[18] = 22
        assertNull(decodeOrUnwrapIco(icoBmp))
    }
}