SnowLuma v2.4.2 source snapshot

packages/common/tests/hex.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it } from 'vitest';
+import { fromHex, hexPreview, toHex, toHexUpper } from '../src/hex';
+
+describe('hex', () => {
+    it('encodes only the selected byte view', () => {
+        const bytes = Uint8Array.of(0xff, 0x01, 0xab, 0xff);
+        expect(toHex(bytes.subarray(1, 3))).toBe('01ab');
+        expect(toHexUpper(Buffer.from(bytes).subarray(1, 3))).toBe('01AB');
+    });
+
+    it('toHex / toHexUpper render bytes as zero-padded hex', () => {
+        const b = Uint8Array.from([0x00, 0x0f, 0xa0, 0xff]);
+        expect(toHex(b)).toBe('000fa0ff');
+        expect(toHexUpper(b)).toBe('000FA0FF');
+        expect(toHex(Uint8Array.of())).toBe('');
+    });
+
+    it('hexPreview appends "..." only past maxBytes', () => {
+        const b = Uint8Array.from([1, 2, 3, 4, 5]);
+        expect(hexPreview(b)).toBe('0102030405'); // under the default 64-byte cap
+        expect(hexPreview(b, 5)).toBe('0102030405'); // exactly at the cap → no ellipsis
+        expect(hexPreview(b, 2)).toBe('0102...'); // truncated
+        expect(hexPreview(b, 0)).toBe('...'); // nothing shown, but bytes remain
+    });
+
+    it('fromHex round-trips toHex and rejects odd-length input', () => {
+        const b = Buffer.from([0xde, 0xad, 0xbe, 0xef]);
+        expect(fromHex(toHex(b)).equals(b)).toBe(true);
+        expect(toHex(fromHex('00ffa0'))).toBe('00ffa0');
+        expect(() => fromHex('abc')).toThrow();
+    });
+});