import "package:test/test.dart";
import "package:clawd_code/src/utils/array_utils.dart";


void main() {
  group("intersperse", () {
    test("adds separator between elements", () {
      final result = intersperse([1, 2, 3], (_) => 0);
      expect(result, equals([1, 0, 2, 0, 3]));
    });

    test("empty list stays empty", () {
      expect(intersperse([], (_) => 0), isEmpty);
    });

    test("single element no separator", () {
      expect(intersperse([42], (_) => 0), equals([42]));
    });
  });

  group("countWhere", () {
    test("counts matching elements", () {
      expect(countWhere([1, 2, 3, 4, 5], (x) => x % 2 == 0), equals(2));
    });

    test("zero when none match", () {
      expect(countWhere([1, 3, 5], (x) => x % 2 == 0), equals(0));
    });
  });

  group("uniq", () {
    test("removes duplicates preserving order", () {
      expect(uniq([1, 2, 1, 3, 2, 4]), equals([1, 2, 3, 4]));
    });

    test("empty stays empty", () {
      expect(uniq([]), isEmpty);
    });

    test("strings work too", () {
      expect(uniq(["a", "b", "a", "c"]), equals(["a", "b", "c"]));
    });
  });
}