import { cn } from "../cn";

describe("cn", () => {
  it("joins truthy class names", () => {
    expect(cn("a", "b")).toBe("a b");
  });

  it("drops falsy values", () => {
    expect(cn("a", false, undefined, null, "", "b")).toBe("a b");
  });

  it("resolves tailwind conflicts in favour of the last class", () => {
    expect(cn("px-2", "px-4")).toBe("px-4");
    expect(cn("text-red-500", "text-blue-500")).toBe("text-blue-500");
  });

  it("preserves non-conflicting tailwind classes", () => {
    expect(cn("flex", "items-center", "p-4")).toBe("flex items-center p-4");
  });

  it("flattens nested arrays and objects", () => {
    expect(cn(["a", "b"], { c: true, d: false })).toBe("a b c");
  });
});