feat: support creating worktrees from GitHub pull requests

packages/app/src/screens/new-workspace-picker-item.test.ts

@@ -0,0 +1,59 @@
+import { describe, expect, it } from "vitest";
+import type { GitHubSearchItem } from "@server/shared/messages";
+import { pickerItemToCheckoutRequest, type PickerItem } from "./new-workspace-picker-item";
+
+const prItem: GitHubSearchItem = {
+  kind: "pr",
+  number: 42,
+  title: "Add picker",
+  url: "https://example.com/pull/42",
+  state: "open",
+  body: null,
+  labels: [],
+  baseRefName: "main",
+  headRefName: "feature/picker",
+};
+
+describe("pickerItemToCheckoutRequest", () => {
+  it("returns undefined for no selection (null)", () => {
+    expect(pickerItemToCheckoutRequest(null)).toBeUndefined();
+  });
+
+  it("maps a branch row to branch-off with the branch name", () => {
+    const item: PickerItem = { kind: "branch", name: "dev" };
+    expect(pickerItemToCheckoutRequest(item)).toEqual({
+      action: "branch-off",
+      refName: "dev",
+    });
+  });
+
+  it("maps a github-pr row to checkout using the head ref and pr number", () => {
+    const item: PickerItem = {
+      kind: "github-pr",
+      item: prItem,
+    };
+    expect(pickerItemToCheckoutRequest(item)).toEqual({
+      action: "checkout",
+      refName: "feature/picker",
+      githubPrNumber: 42,
+    });
+  });
+
+  it("handles a github-pr with a null baseRef", () => {
+    const item: PickerItem = {
+      kind: "github-pr",
+      item: {
+        ...prItem,
+        number: 7,
+        title: "Orphan branch",
+        baseRefName: null,
+        headRefName: "orphan",
+      },
+    };
+    expect(pickerItemToCheckoutRequest(item)).toEqual({
+      action: "checkout",
+      refName: "orphan",
+      githubPrNumber: 7,
+    });
+  });
+});