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

describe("cn utility", () => {
  it("should merge class names", () => {
    const result = cn("foo", "bar");
    expect(result).toBe("foo bar");
  });

  it("should handle conditional classes", () => {
    const result = cn("base", true && "included", false && "excluded");
    expect(result).toBe("base included");
  });

  it("should merge tailwind classes correctly", () => {
    const result = cn("px-2 py-1", "px-4");
    expect(result).toBe("py-1 px-4");
  });

  it("should handle arrays of classes", () => {
    const result = cn(["foo", "bar"], "baz");
    expect(result).toBe("foo bar baz");
  });

  it("should handle undefined and null values", () => {
    const result = cn("foo", undefined, null, "bar");
    expect(result).toBe("foo bar");
  });

  it("should handle object syntax", () => {
    const result = cn({ foo: true, bar: false, baz: true });
    expect(result).toBe("foo baz");
  });

  it("should handle empty input", () => {
    const result = cn();
    expect(result).toBe("");
  });

  it("should deduplicate conflicting tailwind utilities", () => {
    const result = cn("text-red-500", "text-blue-500");
    expect(result).toBe("text-blue-500");
  });
});