refactor(app): extract pr-pane derivations into pure utils and unit tests (#713)

Move getStateLabel and getActivityVerb out of pr-pane.tsx into pr-pane-data.ts
so they can be tested without JSDOM, React, or vi.mock. Add exhaustive unit tests
for both helpers alongside the existing mapPrPaneData/formatAge/deriveAvatarColor
coverage. Delete pr-pane.test.tsx — the component test was asserting on derived
label/icon strings that are now covered by pure function tests.

packages/app/src/components/pr-pane.test.tsx

@@ -1,169 +0,0 @@
-import React from "react";
-import { act } from "react";
-import { createRoot, type Root } from "react-dom/client";
-import { JSDOM } from "jsdom";
-import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
-import type { PrPaneData } from "@/utils/pr-pane-data";
-import { PrPane } from "./pr-pane";
-
-const { theme } = vi.hoisted(() => ({
-  theme: {
-    spacing: { 1: 4, 2: 8, 3: 12, 4: 16 },
-    fontSize: { xs: 11, sm: 13, base: 15 },
-    fontWeight: { normal: "400" },
-    colors: {
-      surfaceSidebar: "#0b0b0b",
-      surfaceSidebarHover: "#151515",
-      border: "#222",
-      foreground: "#fff",
-      foregroundMuted: "#aaa",
-      statusSuccess: "#30d158",
-      statusDanger: "#ff453a",
-      statusWarning: "#f2c945",
-      statusMerged: "#a371f7",
-    },
-  },
-}));
-
-vi.mock("react-native-unistyles", () => ({
-  StyleSheet: {
-    create: (factory: unknown) => (typeof factory === "function" ? factory(theme) : factory),
-  },
-  useUnistyles: () => ({ theme }),
-}));
-
-vi.mock("lucide-react-native", () => {
-  const createIcon = (name: string) => (props: Record<string, unknown>) =>
-    React.createElement("span", { ...props, "data-icon": name });
-  return {
-    ChevronDown: createIcon("ChevronDown"),
-    ChevronRight: createIcon("ChevronRight"),
-    CircleCheck: createIcon("CircleCheck"),
-    CircleDot: createIcon("CircleDot"),
-    CircleSlash: createIcon("CircleSlash"),
-    CircleX: createIcon("CircleX"),
-    ExternalLink: createIcon("ExternalLink"),
-    GitMerge: createIcon("GitMerge"),
-    GitPullRequest: createIcon("GitPullRequest"),
-    GitPullRequestClosed: createIcon("GitPullRequestClosed"),
-    GitPullRequestDraft: createIcon("GitPullRequestDraft"),
-    MessageSquare: createIcon("MessageSquare"),
-  };
-});
-
-vi.mock("@/utils/open-external-url", () => ({
-  openExternalUrl: vi.fn(),
-}));
-
-let root: Root | null = null;
-let container: HTMLElement | null = null;
-
-beforeEach(() => {
-  const dom = new JSDOM("<!doctype html><html><body></body></html>");
-  vi.stubGlobal("React", React);
-  vi.stubGlobal("IS_REACT_ACT_ENVIRONMENT", true);
-  vi.stubGlobal("window", dom.window);
-  vi.stubGlobal("document", dom.window.document);
-  vi.stubGlobal("HTMLElement", dom.window.HTMLElement);
-  vi.stubGlobal("Node", dom.window.Node);
-  vi.stubGlobal("navigator", dom.window.navigator);
-
-  container = document.createElement("div");
-  document.body.appendChild(container);
-  root = createRoot(container);
-});
-
-afterEach(() => {
-  if (root) {
-    act(() => {
-      root?.unmount();
-    });
-  }
-  root = null;
-  container = null;
-  vi.unstubAllGlobals();
-});
-
-function makeData(overrides: Partial<PrPaneData> = {}): PrPaneData {
-  return {
-    number: 1284,
-    title: "fix(server,app): coalesce tool call stream events",
-    state: "open",
-    url: "https://github.com/getpaseo/paseo/pull/1284",
-    reviewDecision: "changes_requested",
-    awaitingReviewers: [],
-    checks: [
-      { name: "typecheck", workflow: "CI", status: "success", duration: "1m", url: "#" },
-      { name: "test", workflow: "CI", status: "failure", duration: "2m", url: "#" },
-    ],
-    activity: [
-      {
-        kind: "review",
-        author: "alicek",
-        avatarColor: "#8b5cf6",
-        reviewState: "approved",
-        body: "LGTM",
-        age: "2h ago",
-        url: "#",
-      },
-      {
-        kind: "comment",
-        author: "bmartin",
-        avatarColor: "#f97316",
-        body: "Worth a benchmark before/after.",
-        age: "3h ago",
-        url: "#",
-      },
-    ],
-    ...overrides,
-  };
-}
-
-function render(data: PrPaneData) {
-  act(() => {
-    root?.render(<PrPane data={data} />);
-  });
-}
-
-describe("PrPane", () => {
-  it("renders the PR title and 'Open' state label from the data prop", () => {
-    render(makeData());
-
-    expect(container?.textContent).toContain("fix(server,app): coalesce tool call stream events");
-    expect(container?.textContent).toContain("Open");
-  });
-
-  it("renders the correct state label and icon for each PR state", () => {
-    render(makeData({ state: "draft" }));
-    expect(container?.textContent).toContain("Draft");
-    expect(container?.querySelector('[data-icon="GitPullRequestDraft"]')).not.toBeNull();
-
-    render(makeData({ state: "merged" }));
-    expect(container?.textContent).toContain("Merged");
-    expect(container?.querySelector('[data-icon="GitMerge"]')).not.toBeNull();
-
-    render(makeData({ state: "closed" }));
-    expect(container?.textContent).toContain("Closed");
-    expect(container?.querySelector('[data-icon="GitPullRequestClosed"]')).not.toBeNull();
-  });
-
-  it("derives check summary counts from the data prop", () => {
-    render(makeData());
-    const text = container?.textContent ?? "";
-
-    expect(text).toContain("typecheck");
-    expect(text).toContain("test");
-    // 1 passed, 1 failed, 0 pending — so pending pill is hidden.
-    expect(text).toMatch(/1.*1/);
-  });
-
-  it("derives review summary counts and renders activity rows", () => {
-    render(makeData());
-    const text = container?.textContent ?? "";
-
-    expect(text).toContain("alicek");
-    expect(text).toContain("Approved");
-    expect(text).toContain("bmartin");
-    expect(text).toContain("Commented");
-  });
-});

packages/app/src/components/pr-pane.tsx

@@ -16,6 +16,7 @@ import {
   MessageSquare,
 } from "lucide-react-native";
 import { openExternalUrl } from "@/utils/open-external-url";
+import { getActivityVerb, getStateLabel } from "@/utils/pr-pane-data";
 import type {
   CheckStatus,
   PrPaneActivity,
@@ -283,13 +284,6 @@ function ActivityRow({ item }: { item: PrPaneActivity }) {
   );
 }
 
-function getActivityVerb(item: PrPaneActivity): string {
-  if (item.kind === "comment") return "Commented";
-  if (item.reviewState === "approved") return "Approved";
-  if (item.reviewState === "changes_requested") return "Requested changes";
-  return "Reviewed";
-}
-
 function getStateColor(state: PrState, theme: ReturnType<typeof useUnistyles>["theme"]): string {
   if (state === "open") return theme.colors.statusSuccess;
   if (state === "draft") return theme.colors.foregroundMuted;
@@ -304,13 +298,6 @@ function getStateIcon(state: PrState) {
   return GitPullRequest;
 }
 
-function getStateLabel(state: PrState): string {
-  if (state === "draft") return "Draft";
-  if (state === "merged") return "Merged";
-  if (state === "closed") return "Closed";
-  return "Open";
-}
-
 const styles = StyleSheet.create((theme) => ({
   root: {
     flex: 1,

packages/app/src/utils/pr-pane-data.test.ts

@@ -3,7 +3,13 @@ import type {
   CheckoutPrStatusResponse,
   PullRequestTimelineResponse,
 } from "@server/shared/messages";
-import { deriveAvatarColor, formatAge, mapPrPaneData } from "./pr-pane-data";
+import {
+  deriveAvatarColor,
+  formatAge,
+  getActivityVerb,
+  getStateLabel,
+  mapPrPaneData,
+} from "./pr-pane-data";
 
 type CheckoutPrStatus = NonNullable<CheckoutPrStatusResponse["payload"]["status"]>;
 type PullRequestTimeline = PullRequestTimelineResponse["payload"];
@@ -335,3 +341,38 @@ describe("formatAge", () => {
     expect(formatAge(now - 365 * 24 * 60 * 60_000, now)).toBe("1y ago");
   });
 });
+
+describe("getStateLabel", () => {
+  it.each([
+    ["open", "Open"],
+    ["draft", "Draft"],
+    ["merged", "Merged"],
+    ["closed", "Closed"],
+  ] as const)("maps %s → %s", (state, expected) => {
+    expect(getStateLabel(state)).toBe(expected);
+  });
+});
+
+describe("getActivityVerb", () => {
+  it("returns Commented for comment kind", () => {
+    expect(getActivityVerb({ kind: "comment" })).toBe("Commented");
+  });
+
+  it("returns Approved for approved review", () => {
+    expect(getActivityVerb({ kind: "review", reviewState: "approved" })).toBe("Approved");
+  });
+
+  it("returns Requested changes for changes_requested review", () => {
+    expect(getActivityVerb({ kind: "review", reviewState: "changes_requested" })).toBe(
+      "Requested changes",
+    );
+  });
+
+  it("returns Reviewed for a commented review with body (generic case)", () => {
+    expect(getActivityVerb({ kind: "review", reviewState: "commented" })).toBe("Reviewed");
+  });
+
+  it("returns Reviewed when reviewState is undefined", () => {
+    expect(getActivityVerb({ kind: "review" })).toBe("Reviewed");
+  });
+});

packages/app/src/utils/pr-pane-data.ts

@@ -225,3 +225,17 @@ function hashLogin(login: string): number {
   }
   return hash;
 }
+
+export function getStateLabel(state: PrState): string {
+  if (state === "draft") return "Draft";
+  if (state === "merged") return "Merged";
+  if (state === "closed") return "Closed";
+  return "Open";
+}
+
+export function getActivityVerb(item: Pick<PrPaneActivity, "kind" | "reviewState">): string {
+  if (item.kind === "comment") return "Commented";
+  if (item.reviewState === "approved") return "Approved";
+  if (item.reviewState === "changes_requested") return "Requested changes";
+  return "Reviewed";
+}