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/offline-multiple-edits.test.ts

@@ -0,0 +1,40 @@
+import type { AssertableState } from "../utils/assertable-state";
+import type { TestDefinition } from "../test-definition";
+
+export const offlineMultipleEditsTest: TestDefinition = {
+    description:
+        "Client 0 creates a file and syncs. Client 0 goes offline, edits the file " +
+        "5 times with different content. When Client 0 reconnects, both clients " +
+        "must converge to the final version.",
+    clients: 2,
+    steps: [
+        { type: "create", client: 0, path: "doc.md", content: "original" },
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "barrier" },
+        {
+            type: "assert-consistent",
+            verify: (s: AssertableState): void => {
+                s.assertContent("doc.md", "original");
+            }
+        },
+
+        { type: "disable-sync", client: 0 },
+
+        { type: "update", client: 0, path: "doc.md", content: "edit-1" },
+        { type: "update", client: 0, path: "doc.md", content: "edit-2" },
+        { type: "update", client: 0, path: "doc.md", content: "edit-3" },
+        { type: "update", client: 0, path: "doc.md", content: "edit-4" },
+        { type: "update", client: 0, path: "doc.md", content: "edit-5-final" },
+
+        { type: "enable-sync", client: 0 },
+        { type: "barrier" },
+
+        {
+            type: "assert-consistent",
+            verify: (s: AssertableState): void => {
+                s.assertFileCount(1).assertContent("doc.md", "edit-5-final");
+            }
+        }
+    ]
+};