test(coverage): bootstrap vitest unit infra and add tests at 90%+ per file (#1245) (#1269)

* test(coverage): bootstrap vitest unit infra and add tests at 90%+ per file (#1245)

Establishes the unit-test runtime AGENTS.md mandates: a vitest "unit"
project alongside the existing storybook project, RTL + jest-dom +
happy-dom, a Mantine-aware render helper, and a 90%-line per-file
coverage gate enforced by CI. Adds 66 test files covering all 62
components under elements/groups/screens/views, plus core/mcp and
clients/web/src/utils. Total: 577 tests, 98.7% line coverage globally.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* test(coverage): address PR #1269 review feedback

- AGENTS.md: correct coverage gate description (lines ≥ 90, statements ≥ 85,
  functions ≥ 80, branches ≥ 50) with rationale for the relaxed branch
  threshold
- InspectorView.test.tsx: document what the Math.random() mock values
  (0.1 / 0.99) control vs. STUB_SUCCESS_RATE in InspectorView.tsx
- vite.config.ts / tsconfig.test.json: drop unused `globals: true` and the
  `vitest/globals` type now that every test file imports describe/it/expect/vi
  explicitly; manual `afterEach(cleanup)` in setup.ts remains required because
  testing-library auto-cleanup relies on globalThis.afterEach

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

clients/web/src/test/core/taskNotificationSchemas.test.ts

@@ -0,0 +1,45 @@
+import { describe, it, expect } from "vitest";
+import { TasksListChangedNotificationSchema } from "@inspector/core/mcp/taskNotificationSchemas.js";
+
+describe("TasksListChangedNotificationSchema", () => {
+  it("parses a notification with no params", () => {
+    const result = TasksListChangedNotificationSchema.safeParse({
+      jsonrpc: "2.0",
+      method: "notifications/tasks/list_changed",
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("parses a notification with an empty params object", () => {
+    const result = TasksListChangedNotificationSchema.safeParse({
+      jsonrpc: "2.0",
+      method: "notifications/tasks/list_changed",
+      params: {},
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("parses a notification with arbitrary params", () => {
+    const result = TasksListChangedNotificationSchema.safeParse({
+      jsonrpc: "2.0",
+      method: "notifications/tasks/list_changed",
+      params: { foo: "bar", count: 3 },
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("rejects a notification with the wrong method", () => {
+    const result = TasksListChangedNotificationSchema.safeParse({
+      jsonrpc: "2.0",
+      method: "notifications/resources/list_changed",
+    });
+    expect(result.success).toBe(false);
+  });
+
+  it("rejects when method is missing", () => {
+    const result = TasksListChangedNotificationSchema.safeParse({
+      jsonrpc: "2.0",
+    });
+    expect(result.success).toBe(false);
+  });
+});

clients/web/src/test/renderWithMantine.tsx

@@ -0,0 +1,21 @@
+import type { ReactElement, ReactNode } from "react";
+import { render, type RenderOptions } from "@testing-library/react";
+import { MantineProvider } from "@mantine/core";
+import { theme } from "../theme/theme";
+
+function MantineWrapper({ children }: { children: ReactNode }) {
+  return (
+    <MantineProvider theme={theme} defaultColorScheme="light">
+      {children}
+    </MantineProvider>
+  );
+}
+
+export function renderWithMantine(
+  ui: ReactElement,
+  options?: Omit<RenderOptions, "wrapper">,
+) {
+  return render(ui, { wrapper: MantineWrapper, ...options });
+}
+
+export * from "@testing-library/react";

clients/web/src/test/setup.ts

@@ -0,0 +1,7 @@
+import "@testing-library/jest-dom/vitest";
+import { afterEach } from "vitest";
+import { cleanup } from "@testing-library/react";
+
+afterEach(() => {
+  cleanup();
+});