Revert accidentally included change

packages/dds/tree/src/test/simple-tree/simpleTree.bench.ts

@@ -5,12 +5,7 @@
 
 import { strict as assert, fail } from "node:assert";
 
-import {
-	BenchmarkType,
-	benchmark,
-	isInPerformanceTestingMode,
-	type BenchmarkTimer,
-} from "@fluid-tools/benchmark";
+import { BenchmarkType, benchmark, isInPerformanceTestingMode } from "@fluid-tools/benchmark";
 import {
 	type DeepTreeNode,
 	generateDeepSimpleTree,
@@ -122,26 +117,18 @@ describe("SimpleTree benchmarks", () => {
 						assert.equal(readNumber, expectedValue);
 					},
 				});
-
+				let flexTree: RootNode | undefined;
 				benchmark({
 					type: BenchmarkType.Measurement,
 					title: `${title} (flex node)`,
-					benchmarkFnCustom: async <T>(state: BenchmarkTimer<T>) => {
-						const flexTree = flexNodeInitFunction();
-
-						let duration: number;
-						do {
-							let counter = state.iterationsPerBatch;
-							const before = state.timer.now();
-							while (counter--) {
-								readNumber = treeReadingFunction(flexTree);
-							}
-							const after = state.timer.now();
-
-							assert.equal(readNumber, expectedValue);
-
-							duration = state.timer.toSeconds(before, after);
-						} while (state.recordBatch(duration));
+					before: () => {
+						flexTree = flexNodeInitFunction();
+					},
+					benchmarkFn: () => {
+						readNumber = treeReadingFunction(flexTree ?? fail("Expected flexTree to be set"));
+					},
+					after: () => {
+						assert.equal(readNumber, expectedValue);
 					},
 				});
 			}