Add a few good deterministic tests

frontend/deterministic-tests/src/tests/12-create-merge-delete.test.ts

@@ -0,0 +1,30 @@
+import type { TestDefinition } from "../test-definition";
+
+export const createMergeDeleteTest: TestDefinition = {
+    name: "Concurrent Create, Merge, Then Delete",
+    description:
+        "Two clients create A.md offline with different content. Both come online and " +
+        "the content is merged. Then one client deletes A.md. Both clients should " +
+        "converge on an empty state.",
+    clients: 2,
+    steps: [
+        { type: "create", client: 0, path: "A.md", content: "from-zero" },
+        { type: "create", client: 1, path: "A.md", content: "from-one" },
+
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "barrier" },
+
+        {
+            type: "assert-consistent",
+            verify: (state) => state.assertFileCount(1).assertContains("A.md", "from-zero", "from-one")
+        },
+
+        { type: "delete", client: 0, path: "A.md" },
+        { type: "barrier" },
+
+        { type: "assert-not-exists", client: 0, path: "A.md" },
+        { type: "assert-not-exists", client: 1, path: "A.md" },
+        { type: "assert-consistent", verify: (state) => state.assertFileCount(0) }
+    ]
+};