text: const { djangoFilters } = require("../dist/django-filters");
  
  describe("upper", () => {
    test("mixed case input", () => {
      expect(djangoFilters.upper("Mixed case input")).toBe("MIXED CASE INPUT");
    });
  
    test("unicode", () => {
      expect(djangoFilters.upper("\xeb")).toBe("\xcb");
    });
  
    test("non string input", () => {
      expect(djangoFilters.upper(42)).toBe("42");
    });
  });
  