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import { test, assert } from "../testing/mod.ts";
import { copyBytes } from "./util.ts";
test(function testCopyBytes() {
let dst = new Uint8Array(4);
dst.fill(0);
let src = Uint8Array.of(1, 2);
let len = copyBytes(dst, src, 0);
assert(len === 2);
assert.equal(dst, Uint8Array.of(1, 2, 0, 0));
dst.fill(0);
src = Uint8Array.of(1, 2);
len = copyBytes(dst, src, 1);
assert(len === 2);
assert.equal(dst, Uint8Array.of(0, 1, 2, 0));
dst.fill(0);
src = Uint8Array.of(1, 2, 3, 4, 5);
len = copyBytes(dst, src);
assert(len === 4);
assert.equal(dst, Uint8Array.of(1, 2, 3, 4));
dst.fill(0);
src = Uint8Array.of(1, 2);
len = copyBytes(dst, src, 100);
assert(len === 0);
assert.equal(dst, Uint8Array.of(0, 0, 0, 0));
dst.fill(0);
src = Uint8Array.of(3, 4);
len = copyBytes(dst, src, -2);
assert(len === 2);
assert.equal(dst, Uint8Array.of(3, 4, 0, 0));
});
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