Initial commit

tests/contract/sync-engine.test.ts

@@ -0,0 +1,39 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import {
+  computeBinaryHash,
+  decryptBytes,
+  encryptBytes,
+  generateVaultKey,
+  mergeTextRevisions
+} from "../../packages/sync-engine/src";
+
+test("encryptBytes round-trips binary payloads", async () => {
+  const vaultKey = await generateVaultKey("test-key");
+  const original = new Uint8Array([1, 2, 3, 4, 5]).buffer;
+
+  const encrypted = await encryptBytes(original, vaultKey);
+  const decrypted = await decryptBytes(encrypted, vaultKey);
+
+  assert.deepEqual([...new Uint8Array(decrypted)], [1, 2, 3, 4, 5]);
+});
+
+test("computeBinaryHash is stable for identical binary payloads", async () => {
+  const first = await computeBinaryHash(new Uint8Array([9, 8, 7, 6]).buffer);
+  const second = await computeBinaryHash(new Uint8Array([9, 8, 7, 6]).buffer);
+
+  assert.equal(first, second);
+});
+
+test("mergeTextRevisions reports conflicts when both sides diverge", () => {
+  const result = mergeTextRevisions({
+    base: "alpha",
+    local: "alpha local",
+    remote: "alpha remote"
+  });
+
+  assert.equal(result.status, "conflict");
+  assert.match(result.content, /<<<<<<< LOCAL/);
+  assert.match(result.content, />>>>>>> REMOTE/);
+});