text: describe("correct behavior", () => {
      test("length is 1", () => {
          expect(Temporal.TimeZone.prototype.getPlainDateTimeFor).toHaveLength(1);
      });
  
      test("basic functionality", () => {
          const timeZone = new Temporal.TimeZone("UTC");
          const instant = Temporal.Instant.fromEpochSeconds(123456789);
          const plainDateTime = timeZone.getPlainDateTimeFor(instant);
          expect(plainDateTime.year).toBe(1973);
          expect(plainDateTime.month).toBe(11);
          expect(plainDateTime.day).toBe(29);
          expect(plainDateTime.hour).toBe(21);
          expect(plainDateTime.minute).toBe(33);
          expect(plainDateTime.second).toBe(9);
          expect(plainDateTime.millisecond).toBe(0);
          expect(plainDateTime.microsecond).toBe(0);
          expect(plainDateTime.nanosecond).toBe(0);
          expect(plainDateTime.calendar.id).toBe("iso8601");
      });
  
      test("custom calendar", () => {
          const timeZone = new Temporal.TimeZone("UTC");
          const instant = new Temporal.Instant(0n);
          const calendar = new Temporal.Calendar("iso8601");
          const plainDateTime = timeZone.getPlainDateTimeFor(instant, calendar);
          expect(plainDateTime.calendar).toBe(calendar);
      });
  });
  
  describe("errors", () => {
      test("time zone doesn't have a getOffsetNanosecondsFor function", () => {
          const timeZone = new Temporal.TimeZone("UTC");
          timeZone.getOffsetNanosecondsFor = undefined;
          const instant = new Temporal.Instant(1n);
          expect(() => {
              timeZone.getPlainDateTimeFor(instant);
          }).toThrowWithMessage(TypeError, "null is not a function");
      });
  
      test("this value must be a Temporal.TimeZone object", () => {
          expect(() => {
              Temporal.TimeZone.prototype.getPlainDateTimeFor.call("foo");
          }).toThrowWithMessage(TypeError, "Not an object of type Temporal.TimeZone");
      });
  });
  