Exercise sync target retry wiring

Author: ndycode

test/experimental-sync-target-entry.test.ts

@@ -24,4 +24,38 @@ describe("experimental sync target entry", () => {
 			destination: null,
 		});
 	});
+
+	it("wires windows-safe retry options through readJson", async () => {
+		const sleep = vi.fn(async () => undefined);
+		const readFileWithRetry = vi.fn(async () => '{"hello":"world"}');
+		const normalizeAccountStorage = vi.fn(() => null);
+		let capturedReadJson: ((path: string) => Promise<unknown>) | undefined;
+
+		const loadExperimentalSyncTargetState = vi.fn(async (args) => {
+			capturedReadJson = args.readJson;
+			const parsed = await args.readJson("C:\\state.json");
+			args.normalizeAccountStorage(parsed);
+			return {
+				kind: "target" as const,
+				detection: { kind: "target" as const },
+				destination: null,
+			};
+		});
+
+		await loadExperimentalSyncTargetEntry({
+			loadExperimentalSyncTargetState,
+			detectTarget: () => ({ kind: "target" }) as never,
+			readFileWithRetry,
+			normalizeAccountStorage,
+			sleep,
+		});
+
+		expect(capturedReadJson).toBeDefined();
+		expect(readFileWithRetry).toHaveBeenCalledWith("C:\\state.json", {
+			retryableCodes: new Set(["EBUSY", "EPERM", "EAGAIN", "ENOTEMPTY", "EACCES"]),
+			maxAttempts: 4,
+			sleep,
+		});
+		expect(normalizeAccountStorage).toHaveBeenCalledWith({ hello: "world" });
+	});
 });