test: verify server.watch.ignored patterns in Fresh Vite plugin

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bartlomieju

packages/plugin-vite/tests/config_test.ts

@@ -0,0 +1,26 @@
+import { expect } from "@std/expect";
+import { fresh } from "../src/mod.ts";
+import type { Plugin } from "vite";
+
+Deno.test("fresh plugin - sets server.watch.ignored patterns", () => {
+  const plugins = fresh() as Plugin[];
+  const freshPlugin = plugins.find((p) => p.name === "fresh");
+  expect(freshPlugin).toBeDefined();
+
+  // Call the config hook as Vite would during dev
+  // deno-lint-ignore no-explicit-any
+  const configFn = freshPlugin!.config as any;
+  const result = configFn({}, { command: "serve" });
+
+  const ignored = result?.server?.watch?.ignored;
+  expect(ignored).toBeDefined();
+  expect(Array.isArray(ignored)).toBe(true);
+
+  // Should ignore temp files, editor swap files, and Vite timestamp files
+  expect(ignored).toContain("**/*.tmp.*");
+  expect(ignored).toContain("**/*.timestamp-*");
+  expect(ignored).toContain("**/*.swp");
+  expect(ignored).toContain("**/*.swo");
+  expect(ignored).toContain("**/*~");
+  expect(ignored).toContain("**/.#*");
+});