import { describe, it, expect } from "vitest";
import { cn } from "./utils";

describe("cn", () => {
  it("merges class names", () => {
    expect(cn("foo", "bar")).toBe("foo bar");
  });

  it("filters falsy values", () => {
    expect(cn("foo", false, null, undefined, "", "bar")).toBe("foo bar");
  });

  it("dedupes conflicting tailwind classes", () => {
    // twMerge keeps the last conflicting utility
    expect(cn("px-2", "px-4")).toBe("px-4");
  });

  it("handles conditional class objects via clsx", () => {
    expect(cn("base", { active: true, disabled: false })).toBe("base active");
  });

  it("returns empty string for no args", () => {
    expect(cn()).toBe("");
  });
});