}

  public void testOpen_invalid() {
    assertThrows(IllegalArgumentException.class, () -> Range.open(4, 3));
    assertThrows(IllegalArgumentException.class, () -> Range.open(3, 3));
  }

  public void testClosed() {
    Range<Integer> range = Range.closed(5, 7);
    checkContains(range);
    assertTrue(range.hasLowerBound());
    assertEquals(5, (int) range.lowerEndpoint());
    assertEquals(CLOSED, range.lowerBoundType());

  }

  public void testOpen_invalid() {
    assertThrows(IllegalArgumentException.class, () -> Range.open(4, 3));
    assertThrows(IllegalArgumentException.class, () -> Range.open(3, 3));
  }

  public void testClosed() {
    Range<Integer> range = Range.closed(5, 7);
    checkContains(range);
    assertTrue(range.hasLowerBound());
    assertEquals(5, (int) range.lowerEndpoint());
    assertEquals(CLOSED, range.lowerBoundType());

        assertEquals(0, engine.evaluate("return 0", params));
        engine.close();
    }

    /**
     * Test that close() can be called without error
     */
    @Test
    public void test_close() {
        final GroovyEngine engine = new GroovyEngine();
        engine.evaluate("return 1", new HashMap<>());
        engine.close();
    }

    /**