import { describe, expect, it } from "vitest";import {  diffLineClassName,  diffLinePrefix,  gitDiffHeaderTitle,  parseUnifiedDiff,} from "./git-diff-panel-model"; describe("git diff panel model", () => {  it("parses unified diff files with additions, deletions, and line numbers", () => {    const files = parseUnifiedDiff(`diff --git a/a.ts b/a.ts--- a/a.ts+++ b/a.ts@@ -2,2 +2,3 @@ keep-old+new+extra`);     expect(files).toHaveLength(1);    expect(files[0]).toMatchObject({ path: "a.ts", additions: 2, deletions: 1 });    expect(files[0]?.lines.map((line) => [line.kind, line.oldLine, line.newLine])).toEqual([      ["meta", undefined, undefined],      ["meta", undefined, undefined],      ["meta", undefined, undefined],      ["context", 2, 2],      ["del", 3, undefined],      ["add", undefined, 3],      ["add", undefined, 4],    ]);  });   it("resolves header, row classes, and visible prefixes", () => {    expect(gitDiffHeaderTitle({ branch: "main" }, "/repo")).toBe("main");    expect(gitDiffHeaderTitle(null, "/repo")).toBe("Working tree diff");    expect(gitDiffHeaderTitle(null, null)).toBe("No directory");    expect(diffLineClassName("add")).toContain("emerald");    expect(diffLinePrefix("del")).toBe("-");    expect(diffLinePrefix("meta")).toBe("");  });});