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>

2 files changed, 49 insertions, 0 deletions

diff --git a/frontend/app/components/BorderedContainer.test.tsx b/frontend/app/components/BorderedContainer.test.tsx
new file mode 100644
index 0000000..2d1b663
--- /dev/null
+++ b/frontend/app/components/BorderedContainer.test.tsx
@@ -0,0 +1,33 @@
+/**
+ * @vitest-environment jsdom
+ */
+import { cleanup, render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, test } from "vitest";
+import BorderedContainer from "./BorderedContainer";
+
+afterEach(() => {
+	cleanup();
+});
+
+describe("BorderedContainer", () => {
+	test("renders children", () => {
+		render(<BorderedContainer>Hello World</BorderedContainer>);
+		expect(screen.getByText("Hello World")).toBeDefined();
+	});
+
+	test("applies custom className", () => {
+		render(
+			<BorderedContainer className="custom-class">Content</BorderedContainer>,
+		);
+		const container = screen.getByText("Content").closest("div");
+		expect(container?.className).toContain("custom-class");
+	});
+
+	test("has default border styling", () => {
+		render(<BorderedContainer>Styled</BorderedContainer>);
+		const container = screen.getByText("Styled").closest("div");
+		expect(container?.className).toContain("border-2");
+		expect(container?.className).toContain("border-blue-600");
+		expect(container?.className).toContain("rounded-xl");
+	});
+});
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();
+	});
+});