import { sanitizeFileName } from "./sanitizeFileName";

describe("sanitizeFileName", () => {
  it("returns an empty string when input is undefined", () => {
    expect(sanitizeFileName(undefined)).toBe("");
  });

  it("returns the input unchanged when no newlines are present", () => {
    expect(sanitizeFileName("report.pdf")).toBe("report.pdf");
  });

  it("collapses a single embedded \\n into a space", () => {
    expect(sanitizeFileName("first\nsecond.txt")).toBe("first second.txt");
  });

  it("collapses runs of CR / LF into a single space", () => {
    expect(sanitizeFileName("first\r\n\r\nsecond.txt")).toBe(
      "first second.txt",
    );
  });

  it("leaves spaces unchanged", () => {
    expect(sanitizeFileName("with spaces.pdf")).toBe("with spaces.pdf");
  });
});