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/components/groups/PromptControls/PromptControls.test.tsx

@@ -0,0 +1,129 @@
+import { describe, it, expect, vi } from "vitest";
+import userEvent from "@testing-library/user-event";
+import type { Prompt } from "@modelcontextprotocol/sdk/types.js";
+import { renderWithMantine, screen } from "../../../test/renderWithMantine";
+import { PromptControls } from "./PromptControls";
+
+const samplePrompts: Prompt[] = [
+  {
+    name: "summarize",
+    description: "Summarize the given text into key points",
+  },
+  {
+    name: "translate",
+    description: "Translate text from one language to another",
+  },
+  { name: "analyze", description: "Analyze sentiment and tone of the text" },
+  { name: "code-review", description: "Review code for issues" },
+  { name: "refactor" },
+];
+
+const baseProps = {
+  prompts: samplePrompts,
+  listChanged: false,
+  onRefreshList: vi.fn(),
+  onSelectPrompt: vi.fn(),
+};
+
+describe("PromptControls", () => {
+  it("renders the title and search input", () => {
+    renderWithMantine(<PromptControls {...baseProps} />);
+    expect(screen.getByText("Prompts")).toBeInTheDocument();
+    expect(
+      screen.getByPlaceholderText("Search prompts..."),
+    ).toBeInTheDocument();
+  });
+
+  it("renders all prompts by default", () => {
+    renderWithMantine(<PromptControls {...baseProps} />);
+    expect(screen.getByText("summarize")).toBeInTheDocument();
+    expect(screen.getByText("translate")).toBeInTheDocument();
+    expect(screen.getByText("analyze")).toBeInTheDocument();
+    expect(screen.getByText("code-review")).toBeInTheDocument();
+    expect(screen.getByText("refactor")).toBeInTheDocument();
+  });
+
+  it("filters prompts by name when typing in the search input", async () => {
+    const user = userEvent.setup();
+    renderWithMantine(<PromptControls {...baseProps} />);
+    await user.type(screen.getByPlaceholderText("Search prompts..."), "trans");
+    expect(screen.getByText("translate")).toBeInTheDocument();
+    expect(screen.queryByText("summarize")).not.toBeInTheDocument();
+    expect(screen.queryByText("refactor")).not.toBeInTheDocument();
+  });
+
+  it("filters prompts by description when typing in the search input", async () => {
+    const user = userEvent.setup();
+    renderWithMantine(<PromptControls {...baseProps} />);
+    await user.type(
+      screen.getByPlaceholderText("Search prompts..."),
+      "sentiment",
+    );
+    expect(screen.getByText("analyze")).toBeInTheDocument();
+    expect(screen.queryByText("summarize")).not.toBeInTheDocument();
+  });
+
+  it("filters prompts by title when present", async () => {
+    const user = userEvent.setup();
+    const promptsWithTitle: Prompt[] = [
+      { name: "p1", title: "Alpha Title" },
+      { name: "p2", title: "Beta Title" },
+    ];
+    renderWithMantine(
+      <PromptControls {...baseProps} prompts={promptsWithTitle} />,
+    );
+    await user.type(screen.getByPlaceholderText("Search prompts..."), "alpha");
+    expect(screen.getByText("Alpha Title")).toBeInTheDocument();
+    expect(screen.queryByText("Beta Title")).not.toBeInTheDocument();
+  });
+
+  it("invokes onSelectPrompt when an unselected prompt is clicked", async () => {
+    const user = userEvent.setup();
+    const onSelectPrompt = vi.fn();
+    renderWithMantine(
+      <PromptControls {...baseProps} onSelectPrompt={onSelectPrompt} />,
+    );
+    await user.click(screen.getByText("translate"));
+    expect(onSelectPrompt).toHaveBeenCalledWith("translate");
+  });
+
+  it("does not invoke onSelectPrompt when the already-selected prompt is clicked", async () => {
+    const user = userEvent.setup();
+    const onSelectPrompt = vi.fn();
+    renderWithMantine(
+      <PromptControls
+        {...baseProps}
+        selectedName="translate"
+        onSelectPrompt={onSelectPrompt}
+      />,
+    );
+    await user.click(screen.getByText("translate"));
+    expect(onSelectPrompt).not.toHaveBeenCalled();
+  });
+
+  it("does not show the list-changed indicator when listChanged is false", () => {
+    renderWithMantine(<PromptControls {...baseProps} />);
+    expect(screen.queryByText("List updated")).not.toBeInTheDocument();
+  });
+
+  it("shows the list-changed indicator when listChanged is true and invokes onRefreshList", async () => {
+    const user = userEvent.setup();
+    const onRefreshList = vi.fn();
+    renderWithMantine(
+      <PromptControls
+        {...baseProps}
+        listChanged
+        onRefreshList={onRefreshList}
+      />,
+    );
+    expect(screen.getByText("List updated")).toBeInTheDocument();
+    await user.click(screen.getByRole("button", { name: "Refresh" }));
+    expect(onRefreshList).toHaveBeenCalledTimes(1);
+  });
+
+  it("renders empty list when no prompts", () => {
+    renderWithMantine(<PromptControls {...baseProps} prompts={[]} />);
+    expect(screen.getByText("Prompts")).toBeInTheDocument();
+    expect(screen.queryByText("translate")).not.toBeInTheDocument();
+  });
+});