Add deterministic-tests (#190)

Reviewed-on: https://home.schmelczer.dev/git/git/andras/vault-link/pulls/190
Co-authored-by: Andras Schmelczer <andras@schmelczer.dev>
Co-committed-by: Andras Schmelczer <andras@schmelczer.dev>

frontend/deterministic-tests/src/tests/delete-recreate-concurrent-update.test.ts

@@ -0,0 +1,42 @@
+import type { AssertableState } from "../utils/assertable-state";
+import type { TestDefinition } from "../test-definition";
+
+export const deleteRecreateConcurrentUpdateTest: TestDefinition = {
+    description:
+        "Client 0 deletes and recreates A.md with new content while offline. Client 1 updates A.md concurrently. " +
+        "After client 0 reconnects, both clients must converge with client 0's recreated content preserved.",
+    clients: 2,
+    steps: [
+        { type: "create", client: 0, path: "A.md", content: "original" },
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "barrier" },
+
+        { type: "disable-sync", client: 0 },
+        { type: "delete", client: 0, path: "A.md" },
+        {
+            type: "create",
+            client: 0,
+            path: "A.md",
+            content: "recreated by client 0"
+        },
+
+        {
+            type: "update",
+            client: 1,
+            path: "A.md",
+            content: "updated by client 1"
+        },
+        { type: "sync", client: 1 },
+
+        { type: "enable-sync", client: 0 },
+        { type: "barrier" },
+
+        {
+            type: "assert-consistent",
+            verify: (s: AssertableState): void => {
+                s.assertFileExists("A.md").assertContains("A.md", "recreated");
+            }
+        }
+    ]
+};