editFile.test.ts

import { describe, it, expect } from "vitest";
import { applyExactEdit } from "../src/tools/editFile.js";

describe("applyExactEdit", () => {
  it("replaces a unique exact match", () => {
    const result = applyExactEdit("const a = 1;\nconst b = 2;\n", "const b = 2;", "const b = 3;");
    expect(result).toEqual({ ok: true, result: "const a = 1;\nconst b = 3;\n" });
  });

  it("errors when old_string is not found", () => {
    const result = applyExactEdit("hello\n", "nope", "x");
    expect(result.ok).toBe(false);
    if (!result.ok) expect(result.error).toMatch(/not found/);
  });

  it("errors when old_string matches more than once", () => {
    const result = applyExactEdit("dup\ndup\n", "dup", "x");
    expect(result.ok).toBe(false);
    if (!result.ok) expect(result.error).toMatch(/more than once/);
  });

  it("errors on empty old_string", () => {
    const result = applyExactEdit("abc", "", "x");
    expect(result.ok).toBe(false);
  });

  it("matches across CRLF files and preserves CRLF on write", () => {
    const original = "line1\r\nline2\r\nline3\r\n";
    const result = applyExactEdit(original, "line2\nline3", "lineX");
    expect(result).toEqual({ ok: true, result: "line1\r\nlineX\r\n" });
  });
});