test(frontend): add Vitest test infrastructure and sample tests

Set up Vitest with @testing-library/react and jsdom for frontend
unit testing. Add sample tests for config.ts and BorderedContainer.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/frontend/app/config.test.ts b/frontend/app/config.test.ts
new file mode 100644
index 0000000..6989635
--- /dev/null
+++ b/frontend/app/config.test.ts
@@ -0,0 +1,16 @@
+import { describe, expect, test } from "vitest";
+import { API_BASE_PATH, APP_NAME, BASE_PATH } from "./config";
+
+describe("config", () => {
+	test("BASE_PATH defaults to /", () => {
+		expect(BASE_PATH).toBe("/");
+	});
+
+	test("API_BASE_PATH is based on BASE_PATH", () => {
+		expect(API_BASE_PATH).toBe(`${BASE_PATH}api/`);
+	});
+
+	test("APP_NAME is defined", () => {
+		expect(APP_NAME).toBeTruthy();
+	});
+});